Configure an MLDS Switch as a Querier

You can configure an MLDS switch as a querier on a particular VLAN. When you do this, the switch starts sending general queries at regular time intervals. The querier message sent by the switch will not take part in querier election. If the switch receives a query from any other router, the switch will stop acting as a querier.

In this example, VLAN 4 is the VLAN for which the switch is configured as a querier.

1. Configure the MLDS switch as a querier for a specific VLAN.

   SEFOS# configure terminal
   SEFOS(config)# vlan 4
   SEFOS(config-vlan)# ipv6 mld snooping querier
   SEFOS(config-vlan)# end

   The switch sends general queries on the member ports of VLAN 4 every 125 seconds.

2. View the configuration.

   SEFOS# show ipv6 mld snooping
    
   Snooping VLAN Configuration for the VLAN 4
     MLD Snooping enabled
     MLD Operating version is V1
     Fast leave is disabled
     Snooping switch is configured as Querier
     Snooping switch is acting as Non-Querier
     Query interval is 125 seconds

   The MLDS switch stops acting as a querier on reception of general queries and resumes its querier functionality when there are no MLD routers in the network.

   The MLDS switch continues acting as a querier on reception of router control messages (PIM/OSPF). The switch further continues its query when the router port is not operating and there are no router ports in the switch.