Cisco Catalyst 4500 series Administration Manual page 259

Chapter 5 Configuring Virtual Switching Systems
Configuring a VSL
To configure a port channel to be a VSL, perform this task:
Command
Step 1
Switch(config)# interface port-channel channel_num
Step 2
Switch(config-if)# switch virtual link switch_num
We recommend that you configure the VSL prior to converting the switch into a VSS.
Note
This example shows how to configure the VSL:
Switch-1(config)# interface port-channel 10
Switch-1(config-if)# switch virtual link 1
Switch-1(config-if)# no shutdown
Switch-1(config)# interface tenGigabitEthernet 5/1
Switch-1(config-if)# channel-group 10 mode on
Switch-1(config-if)# no shutdown
Switch-2(config)# interface port-channel 25
Switch-2(config-if)# switch virtual link 2
Switch-2(config-if)# no shutdown
Switch-2(config-if)# interface tenGigabitEthernet 5/2
Switch-2(config-if)# channel-group 25 mode on
Switch-2(config-if)# no shutdown
Adding and Deleting a VSL Port After the Bootup
At any time, you can add and delete VSL ports from a port-channel to increase the nunber of links in the
VSL, to move the port from one port to another, or to remove it from VSL.
Before adding or deleting VSL ports, do the following:
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Ensure all ports are physically connected to the peer switch. The peer port must also be configured
for VSL.
Shutdown the port before configuring VSL. When both ports on the link are configured for VSL,
unshut them.
Spread VSL ports across multiple modules.
While deleting a port, retain at least one "active" VSL port pair. Else, a dual-active operation could
occur.
To save link flap and high CPU, shutdown the ports before VSL is unconfigured.
After adding, deleting, or modifying VSL ports, write the config to nvram (that is, startup-config).
If you need to move ports to another port, account for the bandwidth requirement of VSL. You
should add an additional VSL link in the channel, move ports and remove additional links in the
channel.
Purpose
Enters configuration mode for the specified port
channel.
Assigns the port channel to the virtual link for the
specified switch.
(If the port is admin shutdown)
(If the port is admin shutdown)
(If the port is admin shutdown)
(If the port is admin shutdown)
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
Configuring a VSS
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