Lenovo RackSwitch G8264 Application Manual page 234

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G8264 Application Guide for ENOS 8.4
VLAG with IGMPv3
Consider the following when using VLAG with IGMPv3:
 To maintain synchronization of the groups and sources states on the VLAG
peers, traffic received on vLAG trunks is processed by the primary and then
forwarded to the secondary. The secondary forwards the packets to the peer
when it receives traffic on a vLAG and processes them when received from the
peer.
Traffic received on non‐vLAG ports but on an ISL VLAN is first processed by the

receiving vLAG switch and then forwarded to the peer, which will synchronize
them on the ISL trunk.
 The querier enabled option is supported. After querier election, when one of the
peers is elected as querier, it will generate queries when required.
When the secondary comes up after a reboot or ISL and health‐check fail, the

information on the primary will be considered valid and synchronized with the
secondary.
 PIM and IGMPv3 are not supported to work together on VLAG.
 When configuring VLAG with IGMPv3, the same version of IGMP needs to be
set on both VLAG switches.
 The number of IGMPv3 groups with VLAG depends on the number of included
and excluded sources.
 The total number of supported groups is the same as the number of groups the
switch can learn with VLAG disabled.
All other scenarios will have a behavior similar to IGMPv2 on VLAG.