Odl010006 Stp-rstp-mstp Laboratory Exercise Guide Issue 1

7/27/2019 Odl010006 Stp-rstp-mstp Laboratory Exercise Guide Issue 1

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ODL010005

STP/RSTP/MSTP Laboratory Exercise

Guide

ISSUE 1.0


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ODL010005 STP/RSTP/MSTP Laboratory Exercise Guide ISSUE1.0 Table of Contents

Confidential Information of Huawei. No Spreading without Permission i

Table of Contents

Experiment Description ....................................................................................................................1

Experiment Description ................................................................................................................1Version Introduction .....................................................................................................................1Experiment Objectives .................................................................................................................1Experiment Tasks ........................................................................................................................1Relevant Materials .......................................................................................................................1

Chapter 1 STP/RSTP Configuration .................................................................................................21.1 Networking and Service Description ......................................................................................21.2 Command Line List ................................................................................................................21.3 Configuration procedure ........................................................................................................31.4 Result Verification ..................................................................................................................3

1.4.1 Computation Process of Spanning Tree .....................................................................31.4.2 Port state switching .....................................................................................................91.4.3 Two Work Modes of RSTP ....................................................................................... 111.4.4 Other Configuration .................................................................................................. 121.5 FAQ ..................................................................................................................................... 13

1.6 Configuration Reference ..................................................................................................... 131.6.1 Starting up RSTP ..................................................................................................... 131.6.2 Check the Configured STP Information ................................................................... 131.6.3 Check the Received/Transmitted BPDU Message of Port After the Port StateTransition ........................................................................................................................... 131.6.4 Set the STP-Compatible Mode ................................................................................ 13

Chapter 2 MSTP Configuration ..................................................................................................... 142.1 Networking and Service Description ................................................................................... 142.2 Command Line List ............................................................................................................. 142.3 Configuration flow ............................................................................................................... 152.4 Configuration procedure ..................................................................................................... 152.5 Result Verification ............................................................................................................... 152.6 Configuration Reference ..................................................................................................... 17

2.6.1 Configure Vlan ......................................................................................................... 172.6.2 Starting up MSTP ..................................................................................................... 182.6.3 Configure MST ......................................................................................................... 182.6.4 Active region configuration ....................................................................................... 19


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ODL010005 STP/RSTP/MSTP Laboratory Exercise Guide ISSUE1.0

Confidential Information of Huawei. No Spreading without Permission 1

Experiment Description

Experiment Description

This course introduces the computation process and basic principles of STP in detailin terms of technical theory and operation procedure. This experiment topic describesthe currently prevalent multi-switch for implementing the redundant LAN structure.

Version Introduction

This course corresponds to the product versions: VRP Version 3.10

Experiment Objectives

After completing the hands-on experiment of this course, you will be able to:

Grasp the STP computation process Understand the port state switching Understand the two work modes of RSTP protocol Understand the principle of MSTP protocol

Experiment Tasks

STP/RSTP Computation process and Port state switching. MSTP configuration.

Relevant Materials

Relevant Huawei product operation manuals


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Confidential Information of Huawei. No Spreading without Permission2

Chapter 1 STP/RSTP Configuration

1.1 Networking and Service Description

SS

SS SSSwitchA

SwitchB

SwitchC

E0/1

E0/1

E0/3 E0/3

E0/2

E0/2

SS

SS SSSwitchA

SwitchB

SwitchC

E0/1

E0/1

E0/3 E0/3

E0/2

E0/2

Figure 1-1

3 Quidway S3526E switches; 1 PC, 3 standard network cables, and 1 console cable

1.2 Command Line List The configuration commands in the system view are:

Operation Command

Start/shut down the device RSTP stp { enable |disable }Configure the switch that runs RSTP to work in theSTP compatible mode or the RSTP mode

stp mode { stp | rstp }

Configure the BPDU protection function of the switch stp bpdu-protection

Configure the Bridge preference level of the specificswitch

stp priority bridge-priority

Specify the switch as the root switch of spanning tree stp root primary

Specify the switch as backup root switch of spanningtree

stp root secondary

Configure Forward Delay of the specific switch stp timer forward-delay centisecondsConfigure Hello Time of the specific switch stp timer hello centiseconds

Configure Max Age of the specific switch stp timer max-age centiseconds

Configure the timeout factor of the specific switch stp timeout-factornumber

Configuration commands in the port view:


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Operation Command

Set Path Cost of the Specific Port stp cost costEnable RSTP on the specified port stp enable

Disable RSTP on the specified port stp disable

Configure the specific port as an edge port/non edge

port

stp edged-port { enable | disable }

Configure the loop protection function of the switch stp loop-protection

Set mCheck of the specified port stp mcheck { primary | secondary

Set Whether the Specific Port Is Connected toPoint-to-Point Link

stp point-to-point { auto |force-false | force-true }

Set Priority of the Specific Port stp port priorityport-priority

Configure the Root protection function of the switch stp root-protection

Set the Maximum Transmission Limit for the SpecificPort

stp transmit-limitpacketnum

Display and Debug STP

Operation Command

Display RSTP configuration information aboutthe local switch and the specified ports display stp [ interfaceinterface-list]

Turn on RSTP debugging switch (receiving andtransmitting of packet, event, and error)

[ undo ] debugging stp { error| event |packet | all }

Enable the debugging information to be output atthe terminal

terminal debugging

1.3 Configuration procedure

Task 1: Computation process of spanning tree

Run stp enable in the system-view.

Task 2: Port state switching

Disconnect Switch B from Switch C, and observe the change of the Switch C portstate

Task 3: Two work modes of RSTP

Run stp mode { rstp | stp } in system-view.

Task 4: Other optional configuration

Use commands to change key parameters of STP

1.4 Result Verification

1.4.1 Computation Process of Spanning Tree

As shown in the above figure, 3 Quidway S-series LANSwitches are connected in aring shape. The MAC addresses of the 3 switches are:

Switch A:00e0-fc22-6fda

Switch B:00e0-fc17-c484


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Switch C:00e0-fc26-437c

After the connection is completed, the switch indicator will flash quickly. It indicatesthat the 3 switches forward packets to each other, thus forming a loop. You can STPprotocol to avoid loop.

STP is the abbreviation of Spanning Tree Protocol. This protocol can be used for loop

network. It can trim the loop network into tree-shape network without loops byinterdicting some redundancy paths via certain algorithm, so as to avoid theincrement and endless cycling of packets in the loop network.

The RSTP (Rapid STP) realized by Quidway Ethernet switch is the optimized versionof STP. The "Rapid" is shown in the way that the delay when the root port anddesignated port enter Forwarding status will be reduced greatly, therefore, the timeneed for stabilizing the network topology will be reduced.

On the Quidway Lanswitch, start the STP protocol. The commands are as follows:

[SwitchA] stp enable

[SwitchB] stp enable

[SwitchC] stp enable

After the RSTP protocol is configured in the whole network, each port of the switchenables the RSTP protocol by default. The switch indicator does not flash quickly anylonger. It indicates that the switch has established the loop-free forwarding spanningtree. What does this tree look like? We can analyze theoretically first, and verify ouranalysis results through the state information of the switch.

The process of the implementing the spanning tree algorithm is as follows:

1) Initial status

Initially, each port of each switch generates a configuration message, using the switchitself as root. The root path overhead is 0, the specified switch ID is the ID of thisswitch, and the specified port is this port.

Switch A:

Configuration message of port Ethernet 0/1:

{32768. 00e0-fc22-6fda,0,32768.00e0-fc22-6fda,e0/1}


{32768. 00e0-fc22-6fda,0,32768.00e0-fc22-6fda,e0/3}

Switch B:


{32768.00e0-fc17-c484,0,32768.00e0-fc17-c484,e0/1}


{32768.00e0-fc17-c484,0,32768.00e0-fc17-c484,e0/2} Switch C:


{32768.00e0-fc26-437c,0,32768.00e0-fc26-437c,e0/2}


{32768.00e0-fc26-437c,0,32768.00e0-fc26-437c,e0/3}


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2) Select the best configuration message, and determine the root switch

Each switch sends its configuration message to the outside. When the port receives aconfiguration message with a preference level lower than that of the port itself, theswitch will discard the received configuration message, and do not process theconfiguration message of this port. When the port receives a configuration messagewith a preference level higher than that of the port itself, the switch will replace thecontents of the configuration message with the received configuration message, thenthe Lanswitch will compare the configuration message of this port with theconfiguration message of other ports, and select the best configuration message.

According to the comparison principle, the IDs of the switches are compared first. TheID of the switch is composed of the preference level (default value: 32768) and theMAC address of the switch. Initially, the preference level of the switch is the defaultvalue, and the one with the lowest MAC value is the root. Obviously, the root switchshould be Switch B.

Use the following commands to view the configured STP information.

[SwitchA]display stp

Protocol mode: IEEE RSTP

The bridge ID (Pri.MAC): 32768.00e0-fc22-6fda

The bridge times: Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec

Root bridge ID(Pri.MAC): 32768.00e0-fc17-c484

Root path cost: 200

Bridge bpdu-protection: disabled

Timeout factor: 3

[SwitchB]display stp


The bridge ID (Pri.MAC): 32768.00e0-fc17-c484



Root path cost: 0


Timeout factor: 3

[SwitchC]display stp


The bridge ID (Pri.MAC): 32768.00e0-fc26-437c



Root path cost: 200


Timeout factor: 3

We can see that 3 switches present the following information:

Root bridge ID(Pri.MAC): 32768.00e0-fc17-c484.

Therefore, the root switch is 00e0-fc17-c484, namely, Switch B. The defaultpreference level of the root switch is 32768 (default value, configurable).

3) Then determine the root port, block the redundancy link, and update theconfiguration information of the specified port.

The switch port that receives the preferred configuration message is the root port.The port configuration message will not change. In other ports, if the configurationmessage of a port is updated in the Select the preferred configuration messageprocess, the switch will block this port, and the port configuration message remainsunchanged. This port will not forward data any longer, and will only receive but notsend configuration messages. If the configuration message of a port is not updated inthe Select the preferred configuration message process, the switch will determine itas specified port, and the configuration message will change in this way: The tree rootID is replaced by the tree root ID of the root port; the root path overhead is replaced


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by the root path overhead of configuration message plus the corresponding pathoverhead of root port; the specified switch ID is replaced by the ID of its own switch;and the specified port ID is replaced by the ID of its own port.

In this example, the comparison process of all switches is as follows:

Switch A:

Port Ethernet 0/1 receives the configuration message of Switch B, and Switch Adiscovers that the configuration message preference level of this port is lower thanthe preference level of the received configuration message. Therefore, theconfiguration message of Ethernet 0/1 of this port is updated.

Port Ethernet 0/3 receives the configuration message of Switch C, and Switch Adiscovers that the configuration message preference level of this port is higher thanthe preference level of the received configuration message. Therefore, the receivedconfiguration message is discarded.

Now, the configuration messages of the ports are as follows:


{32768.00e0-fc17-c484,200,32768.00e0-fc17-c484,e0/1}


{32768.00e0-fc22-6fda, 0,32768.00e0-fc22-6fda,e0/3}

Switch A compares the configuration message of each port, selects the configurationmessage of port Ethernet 0/1 as the preferred configuration message, thendetermines port Ethernet 0/1 as the root port. The configuration messages of all portsof the whole switch are updated as follows:

The configuration message of the root port Ethernet 0/1 remains unchanged:{32768.00e0-fc17-c484,200,32768.00e0-fc17-c484,e0/1}. In the configurationmessage of port Ethernet 0/3, the tree root ID is updated to the tree root ID of thepreferred configuration message. The root path overhead is updated to 200, and theID of the specified switch is updated to the ID of this switch, and the ID of thespecified port is updated to the ID of this port. The configuration message is changedto: {32768.00e0-fc17-c484,200,32768.00e0-fc22-6fda,e0/3}. Then the specified portof Switch A sends out its own configuration message periodically.

[SwitchA]display stp interface ethernet0/1 ethernet0/3


The bridge ID (Pri.MAC): 32768.00e0-fc22-6fda


Root bridge ID(Pri.MAC): 32768.00e0-fc17-c484Root path cost: 200Bridge bpdu-protection: disabled

Timeout factor: 3

Port 1 (Ethernet0/1) of bridge is ForwardingPort spanning tree protocol: enabled

Port role: Root Port

Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc17-c484The Port is a non-edged port

Connected to a point-to-point LAN segment

Maximum transmission limit is 3 Packets / hello time

Times: Hello Time 2 sec, Max Age 20 sec

Forward Delay 15, Message Age 0

BPDU sent: 4

TCN: 0, RST: 4, Config BPDU: 0

BPDU received: 458



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Port role: Designated Port

Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc22-6fdaThe Port is a non-edged port





BPDU sent: 563


BPDU received: 5


Switch B:

Port Ethernet 0/1 receives the configuration message of Switch A. Switch B discoversthat the preference level of the configuration message of this port is higher than thatof the received configuration message, so discards the received configurationmessage. The configuration message of port Ethernet 0/2 is similar to port Ethernet0/1. Switch B discovers that the tree root in the configuration message of each portand the specified switch are switch B itself, so deems itself as tree root. Theconfiguration messages of all ports remain unchanged. Afterwards, the configurationmessages are sent out periodically. Now, the configuration messages of the two portsare as follows:

Configuration message of port Ethernet 0/1:{32768.00e0-fc17-c484,0,32768.00e0-fc17- c484,e0/1}

Configuration message of port Ethernet 0/2:{32768.00e0-fc17-c484,0,32768.00e0-fc17- c484,e0/2}

[SwitchB]display stp interface ethernet0/1 ethernet0/2


The bridge ID (Pri.MAC): 32768.00e0-fc17-c484


Root bridge ID(Pri.MAC): 32768.00e0-fc17-c484Root path cost: 0

Bridge bpdu-protection: disabledTimeout factor: 3



Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc17-c484

The Port is a non-edged port





BPDU sent: 719


BPDU received: 6




Port path cost: 200

Port priority: 128






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BPDU sent: 790


BPDU received: 3


Switch C:

Port Ethernet 0/2 receives the configuration message of Switch B, and Switch Cdiscovers that the configuration message preference level of this port is lower thanthe preference level of the received configuration message. Therefore, theconfiguration message of Ethernet 0/2 of this port is updated.

Port Ethernet 0/3 receives the configuration message of Switch A, and Switch Cdiscovers that the configuration message preference level of this port is lower thanthe preference level of the received configuration message. Therefore, theconfiguration message of Ethernet 0/3 of this port is updated.

Now, the configuration messages of the ports are as follows:


{32768.00e0-fc17-c484,200,32768.00e0-fc17-c484,e0/2}


{32768.00e0-fc17-c484,400,32768.00e0-fc22-6fda,e0/3}

Switch C compares the configuration message of each port, selects the configurationmessage of port Ethernet 0/2 as the preferred configuration message, thendetermines port Ethernet 0/2 as the root port. The configuration messages of all portsof the whole switch are updated as follows:

The configuration message of root port Ethernet 0/2 remains unchanged, and the portEthernet 0/3 may be blocked. The port configuration message also remainsunchanged, and this port does not receive the data forwarded from switch A(exclusive of protocol packets of STP) until new conditions occur and trigger the

recalculation of spanning tree, e.g., the link from switch B to switch C breaks down, orthe port receives a preferred configuration message.

[SwitchC]display stp interface ethernet0/2 ethernet0/3




Root bridge ID(Pri.MAC): 32768.00e0-fc17-c484Root path cost: 200Bridge bpdu-protection: disabled

Timeout factor: 3



Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc17-c484The Port is a non-edged port





BPDU sent: 8


BPDU received: 1382



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Port 3 (Ethernet0/3) of bridge is DiscardingPort spanning tree protocol: enabled

Port role: Alternate Port

Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc22-6fdaThe Port is a non-edged port





BPDU sent: 8


BPDU received: 1447


The spanning tree is now determined, and the tree root is switch B. The tree isillustrated below:

SS

SS SSSwitchA

SwitchB

SwitchC

E0/1

E0/1

E0/3 E0/3

E0/2

E0/2

SS

SS SSSwitchA

SwitchB

SwitchC

E0/1

E0/1

E0/3 E0/3

E0/2

E0/2

Figure 1-2

1.4.2 Port state switching

As shown in the above figure, when the spanning tree is in the stable state,ethernet0/2 of switch C is in the forwarding state, receives the BPDU messagenormally, and receives/sends packets normally. ethernet0/3 is in the discarding state,receives BPDU messages normally, but cannot receive or send packets. Listed beloware capabilities of relevant ports in receiving/sending BPDU messages.

debugging stp packet

terminal debugging% Current terminal debugging is on

Port3: Received Packet //The port in the Discarding state receives theBPDU message normally

*0.10511380 SwitchC RSTP/8/PACKET:

Protocol Identifier: 0000

Protocol Version ID: 02

BPDU Type: 02

Flags: 2e

Root Identifier: 80.00.00.e0.fc.17.c4.84


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Root Path Cost: 00c8

Bridge Identifier: 80.00.00.e0.fc.22.6f.daPort Identifier: 80.03

Message Age: 0100

Max Age: 1400

Hello Time: 0200

Forward Delay: 0f00

Version 1 Length: 00


Port2: Received Packet //The port in the Forwarding state receives BPDUmessage normally.*0.10646778 SwitchC RSTP/8/PACKET:



BPDU Type: 02

Flags: 2c

Root Identifier: 80.00.00.e0.fc.17.c4.84Root Path Cost: 0000

Bridge Identifier: 80.00.00.e0.fc.17.c4.84

Port Identifier: 80.02

Message Age: 0000

Max Age: 1400

Hello Time: 0200

Forward Delay: 0f00



Now, Switch B is disconnected from Switch C. This way, the ethernet0/2 port of switchC will not break down. The port ethernet0/3 will change from the Discarding state tothe Forwarding state, and undertake the data receiving/sending.

The RSTP (Rapid STP) realized by Quidway Ethernet switch is the optimized versionof STP. The "Rapid" is shown in the way that the delay when the root port anddesignated port enter Forwarding status will be reduced greatly, therefore, the timeneed for stabilizing the network topology will be reduced.

Preconditions of fast transition of root port state are: Old ports on this switch havestopped forwarding data, and the upstream specified port has begun forwarding data.

The ethernet0/2 port of switch C stops forwarding data, and the ethernet0/3 of theupstream specified port switch A has been in the forwarding state, and meets theconditions of fast forwarding. Port ethernet0/3 of switch C will transition to theforwarding state quickly. The debugging information is as follows:


terminal debugging

Port3: Received Packet*0.11009688 SwitchC RSTP/8/PACKET:



BPDU Type: 02

Flags: 2c

Root Identifier: 80.00.00.e0.fc.17.c4.84

Root Path Cost: 00c8

Bridge Identifier: 80.00.00.e0.fc.22.6f.da

Port Identifier: 80.03Message Age: 0100

Max Age: 1400

Hello Time: 0200

Forward Delay: 0f00



The port display information of switch C is as follows:

display stp interface ethernet0/2 ethernet0/3


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Root path cost: 400


Timeout factor: 3

Port 2 (Ethernet0/2) of bridge is DOWN //This port is disconnected

Port spanning tree protocol: enabled

Port role: Disabled Port

Port path cost: 200000

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc26-437c






BPDU sent: 8


BPDU received: 5166


Port 3 (Ethernet0/3) of bridge is Forwarding //Change to Forwarding state



Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc22-6fda






BPDU sent: 9


BPDU received: 5343


Connect switch B with switch C again, and port ethernet0/2 of switch C will changethe forwarding state again, and the port ethernet0/3 of switch C will be blocked again.

1.4.3 Two Work Modes of RSTP

The RSTP (Rapid STP) realized by Quidway Ethernet switch is the optimized versionof STP. The work modes of RSTP include two types: RSTP mode, andSTP-compatible mode. By default, the RSTP works in the RSTP mode. If all devicesin the network run the RSTP, the switch that runs the RSTP will work in the RSTPmode. If some devices run STP and others run RSTP in the network, it isrecommended to set the switch of RSTP to work in the STP-compatible mode.

Modify the configuration of switch C, and make it work in the STP-compatible mode.The command is:

[SwitchC]stp mode stp

Display the port information of switch C. Verify the interworking between the STPwork mode and the RSTP work mode.

Check the STP information:


Protocol mode: IEEE compatible STP //Work in the STP modeThe bridge ID (Pri.MAC): 32768.00e0-fc26-437c



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Root bridge ID(Pri.MAC): 32768.00e0-fc17-c484 //The root switch is stillSwitchBRoot path cost: 400


Timeout factor: 3



Port path cost: 200

Port priority: 128







BPDU sent: 13


BPDU received: 5185


Port 3 (Ethernet0/3) of bridge is Discarding


Port role: Alternate Port

Port path cost: 200

Port priority: 128

Designated bridge ID(Pri.MAC): 32768.00e0-fc22-6fda






BPDU sent: 9


BPDU received: 5634


As shown above, the root switch is still Switch B. The shape of the spanning treedoes not change. The port ethernet0/2 of switch C is still in the forwarding state. Theethernet 0/3 is still in the discarding state.

1.4.4 Other Configuration

Finally, there are some key parameters about STP, e.g., use the command stppriority { number } to modify the preference of switches, so as to configure thepriority of a specified bridge. Further, you can use the command stproot primaryand the command stp root secondary to specify the root switch and backup rootswitch directly; use the command stpcost {number } to modify the cost value of theport to affect the selection of root port of the spanning tree; or use the command stpedged-port { enable | disable } to configure the edge port. During recalculation ofthe spanning tree, the edge port can be transitioned to the forwarding state directly,thus avoiding the unnecessary transition time.

The STP implemented by the Quidway S-series switches also includes many otherparameters. By configuring such parameters, the switch performance can be exertedto a better extent, thus improving the network reliability. The learners can experiencethis in the lab.


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1.5 FAQ

Q: When I enable debugging to check the debugging information, the informationkeeps updating, and the screen keeps scrolling down, which is not stoppable. Whatshould I do?

A: You have to use the command undo debugging all to disable the debugginginformation and stop the output of information. When inputting the command, theoutput information may submerge the command characters that you have input. Justinput the complete command characters and press Enter. In addition, you can use themouse to select some of the information, and screen will stop scrolling down.

1.6 Configuration Reference

1.6.1 Starting up RSTP

[SwitchA]stp enable

[SwitchB]stp enable

[SwitchC]stp enable

1.6.2 Check the Configured STP Information

[SwitchA]display stp

[SwitchB]display stp

[SwitchC]display stp

[SwitchA]display stp interface ethernet0/1 ethernet0/3

[SwitchB]display stp interface ethernet0/1 ethernet0/2


1.6.3 Check the Received/Transmitted BPDU Message of Port After the PortState Transition


terminal debugging

1.6.4 Set the STP-Compatible Mode

[SwitchC]stp mode stp



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Chapter 2 MSTP Configuration Additional task

2.1 Networking and Service Description

Switch A

Switch C

Switch B

Switch D

Permit :VLAN 10, 20

Permit :VLAN 10, 20

Permit :VLAN 20, 30

Permit :VLAN 20, 30

Permit :all VLAN

Permit :VLAN 20, 40

Switch A

Switch C

Switch B

Switch D

Permit :VLAN 10, 20

Permit :VLAN 10, 20

Permit :VLAN 20, 30

Permit :VLAN 20, 30

Permit :all VLAN

Permit :VLAN 20, 40

Figure 2-1

4 Quidway S3900 switches; 1 PC, 6 standard network cables, and 1 console cable

2.2 Command Line List

The configuration commands in the system view are:

Operation Command

Enter MSTP region view stp region-configuration

Configuration commands in the MST region view:

Operation Command

Specify region name region-namename

Specify revision level revision-levellevel

Spanning tree instance instanceinstance-idvlanvlan-list

Active region configuration active region-configuration

Display and Debug STP

Operation Command

Display STP configuration information about the localswitch and the specified ports

display stp

Display Spanning tree instance configuration information display stp instance instance-id[ interface

interface-list][ brief]Display MSTP region configuration information display stp region-configuration

Reset stp reset stp [ interfaceinterface-list]

Turn on RSTP debugging switch debugging stp [ interfaceinterface-list] { packet |event }


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2.3 Configuration flow

Vlan configuration

MSTI configuration

Active region

Run MSTP

Vlan configuration

MSTI configuration

Active region

Run MSTP

Figure 2-1

2.4 Configuration procedure

1) Vlan configuration

All the switches configure vlan 1, 2, 3, 4 and set the link between each switch as trucktype.

2) Run MSTPIn the system view, enable STP by default as MSTP mode.3) MST configurationAll switches belong to the same MST region. Configure every MSTI for every vlan.Configure MST attributes.

4) Active region configurationManually activate the MST region configuration

2.5 Result Verification

After finishing configuration, until network is stable, we can check all switches portsstatus.

[SWA]display stp brief

MSTID Port Role STP State Protection

0 Ethernet1/0/1 DESI FORWARDING NONE

0 Ethernet1/0/2 ROOT FORWARDING NONE



1 Ethernet1/0/2 ROOT FORWARDING NONE1 Ethernet1/0/3 DESI FORWARDING NONE




[SWB]display stp brief


0 Ethernet1/0/1 ALTE DISCARDING NONE




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[SWC]display stp brief









[SWD]display stp brief











Note:

The first column MSTID indicates the instance of the port. If its value is 0, it means CIST.

The third column Role indicates the role that the port acts as on the instance. Different instancescalculate separately.

The fourth column STP State indicates the status of the port. Because SWC has the smallest MAC address, it is the root bridge. So the states and the roles are

the same.

From the information above you can know the role of each port. You can also look upthe whole information about STP.

[SWA]dis stp

-------[CIST Global Info][Mode MSTP]-------

CIST Bridge :32768.00e0-fc58-271dBridge Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20

CIST Root/ERPC :32768.00e0-fc49-0d31 / 0CIST RegRoot/IRPC :32768.00e0-fc49-0d31 / 199999CIST RootPortId :128.2BPDU-Protection :disabled

TC or TCN received :22

Time since last TC :0 days 0h:3m:58s

----[Port1(Ethernet1/0/1)][FORWARDING]----Port Protocol :enabled

Port Role :CIST Designated Port

Port Priority :128Port Cost(Dot1T) :Config=auto / Active=199999Desg. Bridge/Port :32768.00e0-fc58-271d / 128.1

Port Edged(Admin) :disabled

Point-to-point :Config=auto / Active=true

Transit Limit :3 packets/hello-time

Protection Type :None

Num of Vlans Mapped :1

PortTimes :Hello 2s MaxAge 20s FwDly 15s RemHop 0

BPDU Sent :2358

TCN: 0, Config: 0, RST: 0, MST: 2358


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BPDU Received :996


----[Port2(Ethernet1/0/2)][FORWARDING]----

Port Protocol :enabled

Port Role :CIST Root Port

Port Priority :128

Port Cost(Dot1T) :Config=auto / Active=199999

Desg. Bridge/Port :32768.00e0-fc49-0d31 / 128.2







BPDU Sent :14


BPDU Received :3591


----[Port3(Ethernet1/0/3)][FORWARDING]----Port Protocol :enabled

Port Role :CIST Designated Port

Port Priority :128

Port Cost(Dot1T) :Config=auto / Active=199999

Desg. Bridge/Port :32768.00e0-fc58-271d / 128.3







BPDU Sent :2353


BPDU Received :1272


2.6 Configuration Reference

2.6.1 Configure Vlan

I. Configure Switch A

[SWA]vlan 10

[SWA]vlan 20

[SWA]vlan 30

[SWA]vlan 40

[SWA]interface Ethernet 1/0/1

[SWA-Ethernet1/0/1]port link-type trunk

[SWA-Ethernet1/0/1]port trunk permit vlan all


[SWA-Ethernet1/0/2]port link-type trunk

[SWA-Ethernet1/0/2]port trunk permit vlan 10 20


[SWA-Ethernet1/0/3]port link-type trunk[SWA-Ethernet1/0/3]port trunk permit vlan 20 30

II. Configure Switch B

[SWB]vlan 10

[SWB]vlan 20

[SWB]vlan 30

[SWB]vlan 40

[SWB]interface Ethernet 1/0/1


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[SWB-Ethernet1/0/1]port link-type trunk

[SWB-Ethernet1/0/1]port trunk permit vlan all



[SWB-Ethernet1/0/4]port trunk permit vlan 10 20



[SWB-Ethernet1/0/5]port trunk permit vlan 20 30

III. Configure Switch C

[SWC]vlan 10

[SWC]vlan 20

[SWC]vlan 40

[SWC]interface Ethernet 1/0/2

[SWC-Ethernet1/0/2]port link-type trunk

[SWC-Ethernet1/0/2]port trunk permit vlan 10 20







IV. Configure Switch D[SWD]vlan 20

[SWD]vlan 30

[SWD]vlan 40

[SWD]interface Ethernet 1/0/3

[SWD-Ethernet1/0/3]port link-type trunk

[SWD-Ethernet1/0/3]port trunk permit vlan 20 30







2.6.2 Starting up MSTP

[SWA]stp enable

[SWB]stp enable

[SWC]stp enable

[SWD]stp enable

2.6.3 Configure MST

I. Configure Switch A

[SWA]stp region-configuration

[SWA-mst-region]region-name test

[SWA-mst-region]revision-level 0

[SWA-mst-region]instance 1 vlan 1



II. Configure Switch B

[SWB]stp region-configuration

[SWB-mst-region]region-name test

[SWB-mst-region]revision-level 0

[SWB-mst-region]instance 1 vlan 1




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III. Configure Switch C

[SWC]stp region-configuration

[SWC-mst-region]region-name test

[SWC-mst-region]revision-level 0

[SWC-mst-region]instance 1 vlan 1



IV. Configure Switch D

[SWD]stp region-configuration

[SWD-mst-region]region-name test

[SWD-mst-region]revision-level 0

[SWD-mst-region]instance 1 vlan 1



2.6.4 Active region configuration

[SWA-mst-region]active region-configuration

[SWB-mst-region]active region-configuration

[SWC-mst-region]active region-configuration

[SWD-mst-region]active region-configuration

Documents

Odl010006 Stp-rstp-mstp Laboratory Exercise Guide Issue 1