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Ali Nezhad
Routing and Switching
CNET 311
Centennial College
Inter-VLAN Routing Week #11
Ch6. Wayne Lewis
Ali Nezhad
Routing and Switching
CNET 311
2
One-router-interface-per-VLAN Method#1
Traditional way
Multiple router interfaces connected to
Multiple physical switch ports.
Switch ports in access mode
Each switch port connected to the router
assigned to a different static VLAN
A router interface assigned to each VLAN.
Ali Nezhad
Routing and Switching
CNET 311
3
One-router-interface-per-VLAN
Ali Nezhad
Routing and Switching
CNET 311
4
Router-on-a-stick Method#2
Our focus
Uses only one router interface and one
switch port.
The switch-router link is a trunk.
Router uses virtual subinterfaces.
S/W entities associated with an interface .
Ali Nezhad
Routing and Switching
CNET 311
5
Router-on-a-stick
Ali Nezhad
Routing and Switching
CNET 311
6
L3 Switch Method#3
A L3 switch acting as a switch as
well as a router.
Explained in CH3 as SVI.
Switch must have IP routing enabled.
Modern way but beyond our scope.
Ali Nezhad
Routing and Switching
CNET 311
7
L3 Switch
Ali Nezhad
Routing and Switching
CNET 311
8
Configuring InterVLAN Routing
Ali Nezhad
Routing and Switching
CNET 311
9
One-router-interface-per-VLAN
Ali Nezhad
Routing and Switching
CNET 311
10
One-router-interface-per-VLAN 1- Configure the switch
Create VLANs.
Configure interfaces as access ports.
Assign ports to VLANs.
Ali Nezhad
Routing and Switching
CNET 311
11
One-router-interface-per-VLAN 2- Configure the router
Each router interface in use will be the default gateway for all devices in the corresponding VLAN.
Assign an IP-add in the appropriate VLAN to each router-connected interface .
Activate the interface.
Ali Nezhad
Routing and Switching
CNET 311
12
One-router-interface-per-VLAN
3- Verify
Examine routing table
Examine IP addresses
on the router
command: show run
Verify interVLAN
connectivity.
Ping PC to PC.
Ali Nezhad
Routing and Switching
CNET 311
13
Router-on-a-stick
Similar to previous method but with sub-if’s.
Enable/disable the physical interface on the
router to enable/disable subinterfaces.
Ali Nezhad
Routing and Switching
CNET 311
14
Router-on-a-stick
Ali Nezhad
Routing and Switching
CNET 311
15
Router-on-a-stick 1- Configure the switch
Create VLANs.
Configure the interface as a trunk.
Note: The router does not use DTP. therefore, you cannot use the commands: sw mode dynamic auto or sw mode dynamic desirable.
Ali Nezhad
Routing and Switching
CNET 311
16
Router-on-a-stick 2- Configure the router
Create a sub-if for each VLAN.
Configure encapsulation for that sub-if.
Assign it an IP-add in its VLAN.
Activate the physical interface.
Ali Nezhad
Routing and Switching
CNET 311
17
Router-on-a-stick 3- Verify
Examine routing table
Examine IP addresses
on the router
command: show run
Verify interVLAN
connectivity.
Ping PC to PC.
Ali Nezhad
Routing and Switching
CNET 311
18
Troubleshooting Switch Config Issues
Switch port and router-if: must be in the same VLAN
Switch port mode
Access for method#1
Trunk for method#2
Inactive trunk for method#2
show int <interface> switchport
Router Config Issues
Wrong interface-VLAN association
encap dot1q <vlan-id>
sh int and sh run
IP Addressing Issues
Ali Nezhad
Routing and Switching
CNET 311
19
Questions?