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.
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.
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.