FastIron Ethernet Switch Layer 3 Routing …...Configuring an OSPF distribution list using route maps .....261 Modify SPF Modify redistribution metric ... FastIron Ethernet Switch

Supporting FastIron Software Release 08.0.30mb

CONFIGURATION GUIDE

FastIron Ethernet Switch Layer 3 RoutingConfiguration Guide, 08.0.30mb

53-1003627-0624 February 2017

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FastIron Ethernet Switch Layer 3 Routing Configuration Guide, 08.0.30mb2 53-1003627-06

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ContentsPreface................................................................................................................................................................................................................................15

Document conventions.........................................................................................................................................................................................................................15Notes, cautions, and warnings..................................................................................................................................................................................................15Text formatting conventions......................................................................................................................................................................................................15Command syntax conventions.................................................................................................................................................................................................16

Brocade resources..................................................................................................................................................................................................................................16Document feedback.............................................................................................................................................................................................................................. 16Contacting Brocade Technical Support......................................................................................................................................................................................... 17

Brocade customers.......................................................................................................................................................................................................................17Brocade OEM customers.......................................................................................................................................................................................................... 17

About This Document..................................................................................................................................................................................................... 19Supported hardware and software...................................................................................................................................................................................................19What’s new in this document............................................................................................................................................................................................................. 19

IP Configuration................................................................................................................................................................................................................21Basic IP configuration........................................................................................................................................................................................................................... 21IP configuration overview.....................................................................................................................................................................................................................21

Full Layer 3 support..................................................................................................................................................................................................................... 21IP interfaces......................................................................................................................................................................................................................................22IP packet flow through a Layer 3 switch.............................................................................................................................................................................. 23IP route exchange protocols......................................................................................................................................................................................................26IP multicast protocols...................................................................................................................................................................................................................27IP interface redundancy protocols.......................................................................................................................................................................................... 27ACLs and IP access policies.....................................................................................................................................................................................................27

Basic IP parameters and defaults - Layer 3 switches.............................................................................................................................................................28When parameter changes take effect....................................................................................................................................................................................28IP global parameters - Layer 3 switches.............................................................................................................................................................................28IP interface parameters - Layer 3 switches........................................................................................................................................................................32

Basic IP parameters and defaults - Layer 2 switches.............................................................................................................................................................33IP global parameters - Layer 2 switches.............................................................................................................................................................................33Interface IP parameters - Layer 2 switches........................................................................................................................................................................35

Configuring IP parameters - Layer 3 switches...........................................................................................................................................................................35Configuring IP addresses........................................................................................................................................................................................................... 35Configuring 31-bit subnet masks on point-to-point networks..................................................................................................................................38Configuring DNS resolver..........................................................................................................................................................................................................40Configuring packet parameters................................................................................................................................................................................................43Changing the router ID................................................................................................................................................................................................................ 46Specifying a single source interface for specified packet types.................................................................................................................................47Configuring delay time for notifying VE down event...................................................................................................................................................... 50ARP parameter configuration...................................................................................................................................................................................................51Configuring forwarding parameters....................................................................................................................................................................................... 57Disabling ICMP messages........................................................................................................................................................................................................ 59Enabling ICMP redirect messages......................................................................................................................................................................................... 60Static routes configuration......................................................................................................................................................................................................... 61Configuring a default network route.......................................................................................................................................................................................69Configuring IP load sharing.......................................................................................................................................................................................................70

FastIron Ethernet Switch Layer 3 Routing Configuration Guide, 08.0.30mb53-1003627-06 3

ECMP load sharing for IPv6.....................................................................................................................................................................................................73ICMP Router Discovery Protocol configuration................................................................................................................................................................75IRDP parameters........................................................................................................................................................................................................................... 75Reverse Address Resolution Protocol configuration.......................................................................................................................................................76Configuring UDP broadcast and IP helper parameters.................................................................................................................................................78BootP and DHCP relay parameter configuration.............................................................................................................................................................81DHCP server....................................................................................................................................................................................................................................83Displaying DHCP server information....................................................................................................................................................................................93

Configuring IP parameters - Layer 2 switches...........................................................................................................................................................................95Configuring the management IP address and specifying the default gateway................................................................................................... 95Configuring Domain Name System resolver.....................................................................................................................................................................96Changing the TTL threshold.....................................................................................................................................................................................................98DHCP Assist configuration........................................................................................................................................................................................................99

IPv4 point-to-point GRE tunnels .................................................................................................................................................................................................103IPv4 GRE tunnel overview......................................................................................................................................................................................................103GRE packet structure and header format.........................................................................................................................................................................104Path MTU Discovery support................................................................................................................................................................................................104Configuration considerations for PMTUD support .....................................................................................................................................................105Tunnel loopback ports for GRE tunnels............................................................................................................................................................................105Support for IPv4 multicast routing over GRE tunnels.................................................................................................................................................106GRE support with other features .........................................................................................................................................................................................107Configuration considerations for GRE IP tunnels......................................................................................................................................................... 107Configuration tasks for GRE tunnels.................................................................................................................................................................................. 109Example point-to-point GRE tunnel configuration.......................................................................................................................................................116Displaying GRE tunneling information...............................................................................................................................................................................118Clearing GRE statistics.............................................................................................................................................................................................................122

Bandwidth for IP interfaces..............................................................................................................................................................................................................122Limitations and pre-requisites...............................................................................................................................................................................................123OSPF cost calculation with interface bandwidth........................................................................................................................................................... 123Setting the bandwidth value for an Ethernet interface.................................................................................................................................................124Setting the bandwidth value for a VE interface.............................................................................................................................................................. 124Setting the bandwidth value for a tunnel interface........................................................................................................................................................125

Displaying IP configuration information and statistics..........................................................................................................................................................126Changing the network mask display to prefix format.................................................................................................................................................. 126Displaying IP information - Layer 3 switches.................................................................................................................................................................126Displaying IP information - Layer 2 switches.................................................................................................................................................................138

Disabling IP checksum check.........................................................................................................................................................................................................141

Layer 3 Routing Protocols........................................................................................................................................................................................... 143Adding a static IP route......................................................................................................................................................................................................................143

Configuring a "null" route.........................................................................................................................................................................................................144Static route next hop resolution............................................................................................................................................................................................ 145Static route recursive lookup..................................................................................................................................................................................................145Static route resolve by default route....................................................................................................................................................................................145

Adding a static ARP entry................................................................................................................................................................................................................ 146Modifying and displaying Layer 3 system parameter limits.............................................................................................................................................. 146

Layer 3 configuration notes................................................................................................................................................................................................... 146FastIron second generation modules.................................................................................................................................................................................146FastIron third generation modules.......................................................................................................................................................................................147Displaying Layer 3 system parameter limits...................................................................................................................................................................147

Enabling or disabling routing protocols...................................................................................................................................................................................... 147


Enabling or disabling Layer 2 switching.....................................................................................................................................................................................148Configuration notes and feature limitations for Layer 2 switching.........................................................................................................................148Command syntax for Layer 2 switching........................................................................................................................................................................... 148

Configuring a Layer 3 Link Aggregration Group (LAG)....................................................................................................................................................... 149

IPv6 Configuration on FastIron X Series, FCX, and ICX Series Switches..........................................................................................................151Full Layer 3 IPv6 feature support.................................................................................................................................................................................................151IPv6 addressing overview................................................................................................................................................................................................................ 152

IPv6 address types.................................................................................................................................................................................................................... 152IPv6 stateless auto-configuration........................................................................................................................................................................................154

IPv6 CLI command support ..........................................................................................................................................................................................................155IPv6 host address on a Layer 2 switch.......................................................................................................................................................................................157

Configuring a global or site-local IPv6 address with a manually configured interface ID............................................................................157Configuring a link-local IPv6 address as a system-wide address for a switch.................................................................................................157

Configuring the management port for an IPv6 automatic address configuration....................................................................................................158Configuring basic IPv6 connectivity on a Layer 3 switch................................................................................................................................................... 158

Enabling IPv6 routing............................................................................................................................................................................................................... 158IPv6 configuration on each router interface.................................................................................................................................................................... 158Configuring IPv4 and IPv6 protocol stacks.....................................................................................................................................................................161

IPv6 management (IPv6 host support)......................................................................................................................................................................................162Configuring IPv6 management ACLs............................................................................................................................................................................... 162Restricting SNMP access to an IPv6 node..................................................................................................................................................................... 162Specifying an IPv6 SNMP trap receiver........................................................................................................................................................................... 162Configuring SNMP V3 over IPv6........................................................................................................................................................................................162Secure Shell, SCP, and IPv6..................................................................................................................................................................................................163IPv6 Telnet.....................................................................................................................................................................................................................................163IPv6 traceroute............................................................................................................................................................................................................................ 163IPv6 Web management using HTTP and HTTPS.......................................................................................................................................................164Restricting Web management access................................................................................................................................................................................164Restricting Web management access by specifying an IPv6 ACL....................................................................................................................... 164Restricting Web management access to an IPv6 host...............................................................................................................................................165Configuring name-to-IPv6 address resolution using IPv6 DNS resolver..........................................................................................................165Defining an IPv6 DNS entry.................................................................................................................................................................................................. 165Pinging an IPv6 address......................................................................................................................................................................................................... 165Configuring an IPv6 Syslog server......................................................................................................................................................................................166Viewing IPv6 SNMP server addresses............................................................................................................................................................................. 167Disabling router advertisement and solicitation messages.......................................................................................................................................167Disabling IPv6 on a Layer 2 switch.................................................................................................................................................................................... 167

IPv6 ICMP feature configuration...................................................................................................................................................................................................168Configuring ICMP rate limiting..............................................................................................................................................................................................168Enabling IPv6 ICMP redirect messages...........................................................................................................................................................................169

IPv6 neighbor discovery configuration.......................................................................................................................................................................................169IPv6 neighbor discovery configuration notes.................................................................................................................................................................170Neighbor solicitation and advertisement messages....................................................................................................................................................170Router advertisement and solicitation messages......................................................................................................................................................... 170Neighbor redirect messages..................................................................................................................................................................................................171Setting neighbor solicitation parameters for duplicate address detection..........................................................................................................171Setting IPv6 router advertisement parameters..............................................................................................................................................................172Prefixes advertised in IPv6 router advertisement messages...................................................................................................................................173Setting flags in IPv6 router advertisement messages................................................................................................................................................ 174Enabling and disabling IPv6 router advertisements.................................................................................................................................................... 174


IPv6 router advertisement preference support..............................................................................................................................................................174Configuring reachable time for remote IPv6 nodes.....................................................................................................................................................175

IPv6 MTU............................................................................................................................................................................................................................................... 175Configuration notes and feature limitations for IPv6 MTU....................................................................................................................................... 175Changing the IPv6 MTU......................................................................................................................................................................................................... 176

Static neighbor entries configuration........................................................................................................................................................................................... 176Limiting the number of hops an IPv6 packet can traverse.................................................................................................................................................177IPv6 source routing security enhancements............................................................................................................................................................................177TCAM space on FCX device configuration...............................................................................................................................................................................177

Allocating TCAM space for IPv4 routing information................................................................................................................................................. 178Allocating TCAM space for GRE tunnel information...................................................................................................................................................178

Clearing global IPv6 information...................................................................................................................................................................................................178Clearing the IPv6 cache...........................................................................................................................................................................................................178Clearing IPv6 neighbor information....................................................................................................................................................................................179Clearing IPv6 routes from the IPv6 route table.............................................................................................................................................................179Clearing IPv6 traffic statistics................................................................................................................................................................................................ 180

Displaying global IPv6 information.............................................................................................................................................................................................. 180Displaying IPv6 cache information..................................................................................................................................................................................... 180Displaying IPv6 interface information................................................................................................................................................................................181Displaying IPv6 neighbor information...............................................................................................................................................................................182Displaying the IPv6 route table ............................................................................................................................................................................................183Displaying local IPv6 routers................................................................................................................................................................................................. 185Displaying IPv6 TCP information........................................................................................................................................................................................ 186Displaying IPv6 traffic statistics............................................................................................................................................................................................188

DHCP relay agent for IPv6..............................................................................................................................................................................................................191Configuring DHCP for IPv6 relay agent........................................................................................................................................................................... 191Enabling the interface-ID on the DHCPv6 relay agent messages........................................................................................................................192Displaying DHCPv6 relay agent information..................................................................................................................................................................192Displaying the DHCPv6 Relay configured destinations.............................................................................................................................................192Displaying the DHCPv6 Relay information for an interface..................................................................................................................................... 193

DHCPv6 Relay Agent Prefix Delegation Notification...........................................................................................................................................................193DHCPv6 Relay Agent Prefix Delegation Notification limitations............................................................................................................................194Upgrade and downgrade considerations..........................................................................................................................................................................195Configuring DHCPv6 Relay Agent Prefix Delegation Notification........................................................................................................................ 195Displaying the DHCPv6 Relay Agent Prefix Delegation Notification information...........................................................................................196

RIP.....................................................................................................................................................................................................................................201RIP overview.......................................................................................................................................................................................................................................... 201RIP parameters and defaults...........................................................................................................................................................................................................201

RIP global parameters..............................................................................................................................................................................................................201RIP interface parameters.........................................................................................................................................................................................................203

Configuring RIP parameters............................................................................................................................................................................................................203Enabling RIP................................................................................................................................................................................................................................. 203Configuring route costs............................................................................................................................................................................................................204Changing the administrative distance................................................................................................................................................................................ 204Configuring redistribution........................................................................................................................................................................................................204Configuring route learning and advertising parameters............................................................................................................................................. 206Changing the route loop prevention method.................................................................................................................................................................. 207Suppressing RIP route advertisement on a VRRP or VRRPE backup interface............................................................................................. 208Configuring RIP route filters using prefix-lists and route maps...............................................................................................................................208Setting RIP timers.......................................................................................................................................................................................................................210


Displaying RIP Information..............................................................................................................................................................................................................210Displaying CPU utilization statistics............................................................................................................................................................................................. 212

RIPng................................................................................................................................................................................................................................215RIPng Overview....................................................................................................................................................................................................................................215Configuring RIPng............................................................................................................................................................................................................................... 215

Enabling RIPng............................................................................................................................................................................................................................215Configuring RIPng timers........................................................................................................................................................................................................216Configuring route learning and advertising parameters............................................................................................................................................. 217Redistributing routes into RIPng...........................................................................................................................................................................................218Controlling distribution of routes through RIPng...........................................................................................................................................................219Configuring poison reverse parameters............................................................................................................................................................................219

Clearing RIPng routes from IPv6 route table...........................................................................................................................................................................220Displaying RIPng information.........................................................................................................................................................................................................220

Displaying RIPng configuration............................................................................................................................................................................................ 220Displaying RIPng routing table..............................................................................................................................................................................................221

OSPFv2........................................................................................................................................................................................................................... 223OSPF overview.....................................................................................................................................................................................................................................223OSPF point-to-point links................................................................................................................................................................................................................225Designated routers in multi-access networks..........................................................................................................................................................................225Designated router election in multi-access networks........................................................................................................................................................... 225OSPF RFC 1583 and 2328 compliance................................................................................................................................................................................ 227Reduction of equivalent AS external LSAs................................................................................................................................................................................227

Algorithm for AS external LSA reduction......................................................................................................................................................................... 229Support for OSPF RFC 2328 Appendix E..............................................................................................................................................................................229OSPF graceful restart........................................................................................................................................................................................................................ 230

OSPF stub router advertisement.........................................................................................................................................................................................230OSPF Shortest Path First throttling....................................................................................................................................................................................231IETF RFC and internet draft support..................................................................................................................................................................................231Dynamic OSPF activation and configuration................................................................................................................................................................. 231

Configuring OSPF...............................................................................................................................................................................................................................232Configuration rules.....................................................................................................................................................................................................................232OSPF parameters...................................................................................................................................................................................................................... 232Enable OSPF on the device...................................................................................................................................................................................................233Assign OSPF areas................................................................................................................................................................................................................... 234Assign a totally stubby area....................................................................................................................................................................................................235Assigning an area range (optional) ..................................................................................................................................................................................... 238Assigning an area cost (optional parameter) .................................................................................................................................................................. 238Assigning interfaces to an area............................................................................................................................................................................................. 239Setting all OSPFv2 interfaces to the passive state.......................................................................................................................................................239Modify interface defaults......................................................................................................................................................................................................... 240Changing the timer for OSPF authentication changes...............................................................................................................................................242Block flooding of outbound LSAs on specific OSPF interfaces............................................................................................................................ 243Assign virtual links......................................................................................................................................................................................................................243Modify virtual link parameters............................................................................................................................................................................................... 245Changing the reference bandwidth for the cost on OSPF interfaces................................................................................................................... 246Define redistribution filters...................................................................................................................................................................................................... 248Modify default metric for redistribution............................................................................................................................................................................. 250Enable route redistribution......................................................................................................................................................................................................250Disable or re-enable load sharing........................................................................................................................................................................................251


Configure external route summarization...........................................................................................................................................................................253Configure default route origination......................................................................................................................................................................................254Supported match and set conditions................................................................................................................................................................................. 255

OSPF non-stop routing.................................................................................................................................................................................................................... 256Synchronization of critical OSPF elements.............................................................................................................................................................................. 256

Link state database synchronization...................................................................................................................................................................................256Neighbor router synchronization..........................................................................................................................................................................................257Interface synchronization.........................................................................................................................................................................................................257

Standby module operations............................................................................................................................................................................................................ 257Neighbor database.....................................................................................................................................................................................................................258LSA database...............................................................................................................................................................................................................................258

Enabling and disabling NSR............................................................................................................................................................................................................258Limitations of NSR.....................................................................................................................................................................................................................258

Disabling configuration......................................................................................................................................................................................................................259OSPF distribute list.............................................................................................................................................................................................................................260

Configuring an OSPF distribution list using ACLs ......................................................................................................................................................260Configuring an OSPF distribution list using route maps .......................................................................................................................................... 261Modify SPF timers.....................................................................................................................................................................................................................262Modify redistribution metric type......................................................................................................................................................................................... 263Modify administrative distance............................................................................................................................................................................................. 263Configure OSPF group LSA pacing...................................................................................................................................................................................264Modify OSPF traps generated..............................................................................................................................................................................................265Modify exit overflow interval...................................................................................................................................................................................................265Specify types of OSPF Syslog messages to log..........................................................................................................................................................266Configuring an OSPF network type....................................................................................................................................................................................266Configuring OSPF Graceful Restart................................................................................................................................................................................... 267Configuring OSPF router advertisement..........................................................................................................................................................................269Configuring OSPF shortest path first throttling............................................................................................................................................................. 270

Displaying OSPF information.........................................................................................................................................................................................................271Displaying general OSPF configuration information...................................................................................................................................................271Displaying OSPF area information..................................................................................................................................................................................... 273Displaying OSPF neighbor information............................................................................................................................................................................274Displaying OSPF interface information.............................................................................................................................................................................276Displaying OSPF interface brief information.................................................................................................................................................................. 278Displaying OSPF route information....................................................................................................................................................................................279Displaying OSPF database information............................................................................................................................................................................281Displaying OSPF external link state information...........................................................................................................................................................281Displaying OSPF database-summary information......................................................................................................................................................282Displaying OSPF database link state information........................................................................................................................................................ 283Displaying OSPF ABR and ASBR information............................................................................................................................................................. 284Displaying OSPF trap status................................................................................................................................................................................................. 284Viewing Configured OSPF point-to-point links.............................................................................................................................................................285Displaying OSPF virtual neighbor and link information............................................................................................................................................. 286Clearing OSPF neighbors.......................................................................................................................................................................................................288Displaying OSPF Graceful Restart information.............................................................................................................................................................288Displaying OSPF Router Advertisement information.................................................................................................................................................289

Clearing OSPF information............................................................................................................................................................................................................. 289Clearing OSPF neighbors.......................................................................................................................................................................................................290Disabling and re-enabling the OSPF process................................................................................................................................................................290Clearing OSPF routes...............................................................................................................................................................................................................290


OSPFv3........................................................................................................................................................................................................................... 291OSPFv3 overview................................................................................................................................................................................................................................291LSA types for OSPFv3..................................................................................................................................................................................................................... 291Configuring OSPFv3..........................................................................................................................................................................................................................292

Enabling OSPFv3...................................................................................................................................................................................................................... 292Assigning OSPFv3 areas........................................................................................................................................................................................................293Assigning an area cost for OSPFv3 (optional parameter).........................................................................................................................................297Specifying a network type.......................................................................................................................................................................................................298Configuring virtual links............................................................................................................................................................................................................298Changing the reference bandwidth for the cost on OSPFv3 interfaces..............................................................................................................300Redistributing routes into OSPFv3.....................................................................................................................................................................................301Filtering OSPFv3 routes..........................................................................................................................................................................................................304Configuring default route origination..................................................................................................................................................................................307Modifying Shortest Path First timers..................................................................................................................................................................................308Modifying administrative distance.......................................................................................................................................................................................309Configuring the OSPFv3 LSA pacing interval............................................................................................................................................................... 309Modifying exit overflow interval............................................................................................................................................................................................ 310Modifying external link state database limit.....................................................................................................................................................................310Setting all OSPFv3 interfaces to the passive state.......................................................................................................................................................310Modifying OSPFv3 interface defaults............................................................................................................................................................................... 311Disabling or re-enabling event logging..............................................................................................................................................................................311IPsec for OSPFv3......................................................................................................................................................................................................................312Configuring IPsec for OSPFv3.............................................................................................................................................................................................313Configuring OSPFv3 Graceful Restart Helper mode..................................................................................................................................................318Configuring OSPFv3 Non-stop routing (NSR)..............................................................................................................................................................319

Displaying OSPFv3 information................................................................................................................................................................................................... 319General OSPFv3 configuration information....................................................................................................................................................................320Displaying OSPFv3 area information................................................................................................................................................................................ 320Displaying OSPFv3 database information...................................................................................................................................................................... 321Displaying IPv6 interface information................................................................................................................................................................................325Displaying IPv6 OSPFv3 interface information............................................................................................................................................................ 326Displaying OSPFv3 memory usage.................................................................................................................................................................................. 330Displaying OSPFv3 neighbor information.......................................................................................................................................................................331Displaying routes redistributed into OSPFv3.................................................................................................................................................................334Displaying OSPFv3 route information.............................................................................................................................................................................. 334Displaying OSPFv3 SPF information................................................................................................................................................................................336Displaying OSPFv3 GR Helper mode information .................................................................................................................................................... 339Displaying OSPFv3 NSR information...............................................................................................................................................................................339Displaying IPv6 OSPF virtual link information...............................................................................................................................................................339Displaying OSPFv3 virtual neighbor information.........................................................................................................................................................340IPsec examples............................................................................................................................................................................................................................341

OSPFv3 clear commands ..............................................................................................................................................................................................................347Clearing all OSPFv3 data........................................................................................................................................................................................................347Clearing OSPFv3 data in a VRF..........................................................................................................................................................................................347Clearing all OSPFv3 packet counters................................................................................................................................................................................348Scheduling Shortest Path First (SPF) calculation..........................................................................................................................................................348Clearing all redistributed routes from OSPFv3..............................................................................................................................................................348Clearing OSPFv3 neighbors................................................................................................................................................................................................. 348

Configuring BGP4 (IPv4).............................................................................................................................................................................................351BGP4 overview.....................................................................................................................................................................................................................................351


Relationship between the BGP4 route table and the IP route table......................................................................................................................352How BGP4 selects a path for a route (BGP best path selection algorithm)...................................................................................................... 353BGP4 message types.............................................................................................................................................................................................................. 354Grouping of RIB-out peers.....................................................................................................................................................................................................356

Implementation of BGP4................................................................................................................................................................................................................. 356BGP4 restart..........................................................................................................................................................................................................................................356

BGP4 Peer notification during a management module switchover......................................................................................................................357BGP4 neighbor local AS.........................................................................................................................................................................................................358

Basic configuration and activation for BGP4...........................................................................................................................................................................360Disabling BGP4.......................................................................................................................................................................................................................... 361

BGP4 parameters................................................................................................................................................................................................................................361Parameter changes that take effect immediately.......................................................................................................................................................... 363Parameter changes that take effect after resetting neighbor sessions.................................................................................................................363Parameter changes that take effect after disabling and re-enabling redistribution.........................................................................................364

Memory considerations.....................................................................................................................................................................................................................364Memory configuration options obsoleted by dynamic memory............................................................................................................................ 364

Basic configuration tasks required for BGP4...........................................................................................................................................................................364Enabling BGP4 on the device...............................................................................................................................................................................................365Changing the device ID............................................................................................................................................................................................................365Setting the local AS number.................................................................................................................................................................................................. 365Adding a loopback interface...................................................................................................................................................................................................366Adding BGP4 neighbors.........................................................................................................................................................................................................367Adding a BGP4 peer group................................................................................................................................................................................................... 374

Optional BGP4 configuration tasks............................................................................................................................................................................................. 377Changing the Keep Alive Time and Hold Time..............................................................................................................................................................377Changing the BGP4 next-hop update timer...................................................................................................................................................................377Enabling fast external fallover................................................................................................................................................................................................378Changing the maximum number of paths for BGP4 Multipath load sharing...................................................................................................378Customizing BGP4 Multipath load sharing.....................................................................................................................................................................380Specifying a list of networks to advertise......................................................................................................................................................................... 380Changing the default local preference................................................................................................................................................................................381Using the IP default route as a valid next-hop for a BGP4 route...........................................................................................................................382Changing the default MED (Metric) used for route redistribution...........................................................................................................................382Enabling next-hop recursion..................................................................................................................................................................................................382Changing administrative distances......................................................................................................................................................................................385Requiring the first AS to be the neighbor AS..................................................................................................................................................................386Disabling or re-enabling comparison of the AS-Path length...................................................................................................................................387Enabling or disabling comparison of device IDs........................................................................................................................................................... 387Configuring the device to always compare Multi-Exit Discriminators.................................................................................................................. 387Treating missing MEDs as the worst MEDs....................................................................................................................................................................388Configuring route reflection parameters........................................................................................................................................................................... 388Configuring confederations.................................................................................................................................................................................................... 391Aggregating routes advertised to BGP4 neighbors.....................................................................................................................................................394

Configuring BGP4 restart.................................................................................................................................................................................................................395Configuring BGP4 Restart for the global routing instance....................................................................................................................................... 395Configuring BGP4 Restart for a VRF................................................................................................................................................................................ 395Configuring timers for BGP4 Restart (optional).............................................................................................................................................................395BGP4 null0 routing....................................................................................................................................................................................................................396Configuring BGP4 null0 routing.......................................................................................................................................................................................... 397

Modifying redistribution parameters............................................................................................................................................................................................400


Redistributing connected routes...........................................................................................................................................................................................401Redistributing RIP routes.........................................................................................................................................................................................................401Redistributing OSPF external routes..................................................................................................................................................................................401Redistributing static routes......................................................................................................................................................................................................402Redistributing IBGP routes............................................................

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FastIron Ethernet Switch Layer 3 Routing …...Configuring an OSPF distribution list using route maps .....261 Modify SPF Modify redistribution metric ... FastIron Ethernet Switch