Specifications

Distribution Layer April 2014
50
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 100. Each switch is also given a unique identifier within the domain, switch 1 or switch 2.
Figure 21 - VSS domain
Virtual Switch Domain
VSL 10GbE
EtherChannel
Switch #1 Switch #2
2107
On the standalone switch #1:
VSS-Sw1(config)#switch virtual domain 100
VSS-Sw1(config-vs-domain)# switch 1
On the standalone switch #2:
VSS-Sw2(config)#switch virtual domain 100
VSS-Sw2(config-vs-domain)# switch 2
Step 3: 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).
This example uses the 10-Gigabit Ethernet interfaces on the supervisor of a Cisco Catalyst 6500 Series switch
for the EtherChannel member ports of the VSL.
On standalone switch #1:
VSS-Sw1(config)#interface port-channel 63
VSS-Sw1(config-if)#switch virtual link 1
VSS-Sw1(config-if)#no shutdown
VSS-Sw1(config)#interface range tengigabit 5/4-5
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)#switch virtual link 2
VSS-Sw2(config-if)#no shutdown
VSS-Sw2(config)#interface range tengigabit 5/4-5
VSS-Sw2(config-if)#channel-group 64 mode on
VSS-Sw2(config-if)#no shutdown