Specifications
Distribution Layer April 2014
58
To form a VSS pair, each switch in the pair must have a matching domain ID assigned. To support the
interconnection of multiple VSS pairs, the domain ID selected for the pair should be unique. In this example, the
domain number is 105. Each switch is also given a unique identifier within the domain, switch 1 or switch 2.
Figure 23 - VSS domain
Virtual Switch Domain
VSL 10GbE
EtherChannel
Switch #1 Switch #2
2107
On the standalone switch #1:
VSS-Sw1(config)#switch virtual domain 105
VSS-Sw1(config-vs-domain)# switch 1
On the standalone switch #2:
VSS-Sw2(config)#switch virtual domain 105
VSS-Sw2(config-vs-domain)# switch 2
Step 2: Configure the Virtual Switch Link (VSL).
The VSL is a critical component of the Virtual Switching System. For each physical switch you must select a
unique port-channel number identifying the same VSL. This allows the switch to maintain a separate identity for
the interfaces used when making traffic forwarding decisions. This example uses port-channel number 63 on
switch 1 and port-channel number 64 on switch 2. The PortChannel interface numbers are arbitrary and should
be adapted to best suit your deployment. The chosen values reflect the highest values supported across all
VSS platforms validated in this release. You must configure channel-group mode on for the VSL port channel
because it is an infrastructure link actively managed withing the VSS using Virtual Switch Link Protocol (VSLP).
On standalone switch #1:
VSS-Sw1(config)#interface port-channel 63
VSS-Sw1(config-if)#switchport
VSS-Sw1(config-if)#switch virtual link 1
VSS-Sw1(config-if)#no shutdown
VSS-Sw1(config)#interface range tengigabit 1/30-31
VSS-Sw1(config-if)#shutdown
VSS-Sw1(config-if)#channel-group 63 mode on
VSS-Sw1(config-if)#no shutdown
On standalone switch #2:
VSS-Sw2(config)#interface port-channel 64
VSS-Sw2(config-if)#switchport
VSS-Sw2(config-if)#switch virtual link 2
VSS-Sw2(config-if)#no shutdown
VSS-Sw2(config)#interface range tengigabit 1/30-31
VSS-Sw2(config-if)#shutdown
VSS-Sw2(config-if)#channel-group 64 mode on
VSS-Sw2(config-if)#no shutdown