VSX solution requirements

All VSX switches in your environment must have identical settings for the following:

• The VLAN membership for all VSX trunk ports.

• The loop-protection configuration on a VSX VLAN. VSX VLANs are VLANS that have a VSX LAG as a member.

IGMP-snooping and VSX VLANs: IGMP-snooping must be turned off on a VSX VLAN for each VSX switch.

Modes for 8320 series switches: All switches must be either in mode 3 or in mode 4.

Spanning tree support: Spanning tree is not supported with VSX.

Support for Inter-Switch links (ISLs): VSX LAG does not support layer 3 processing, such as a routed port; however, multiple virtual switch interfaces can be configured on the switch in association with the VLANs carried over the given VSX LAG.

Support for Layer 3: A VSX LAG as a route only port is not supported. You can add VSX LAGs to a switch virtual interface to enable Layer 3.

VLAN support: The same VLAN must be supported on both switches because the ISL is automatically made a member of all VLANs created on the switch, except the peer-keepalive VLAN. The VSX solution synchronizes the VLANs on the secondary VSX switches.

VSX switches and software versions: Both VSX peer switches must use the same software version.