Enabling IGMP snooping querier election

To avoid traffic interruption caused by the failure of a single querier in a VLAN or VSI, configure multiple queriers in the VLAN or VSI and enable querier election. When the elected querier fails, the device starts a new querier election to ensure multicast forwarding. The mechanism for IGMP snooping querier election is the same as that for IGMP querier election. For more information about IGMP querier election, see "Configuring IGMP."

Before you enable IGMP snooping querier election, you must complete the following tasks:

• Enable the IGMP snooping querier for a VLAN or VSI. For more information about enabling the IGMP snooping querier, see "Enabling the IGMP snooping querier."

• Configure the source IP address for IGMP general queries as an IP address different from 0.0.0.0 and the local querier IP address. An IGMP snooping querier performs querier election only if the source IP address of a received IGMP general query is not 0.0.0.0 or its own IP address.

• Make sure the candidate IGMP snooping queriers run the same IGMP snooping version. To specify the IGMP snooping version, use the igmp-snooping version command.

1. Enter system view.

   system-view

2. Enter VLAN view.

   vlan vlan-id

3. Enable IGMP snooping querier election for the VLAN.

   igmp-snooping querier-election

   By default, IGMP snooping querier election is disabled for a VLAN.

1. Enter system view.

   system-view

2. Enter VSI view.

   vsi vsi-name

3. Enable IGMP snooping querier election for the VSI.

   igmp-snooping querier-election

   By default, IGMP snooping querier election is disabled for a VSI.