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BLADEOS 6.5.2 Application Guide
BMD00220, October 2010 Chapter 18: Internet Group Management Protocol 255
IGMP Querier
IGMP Querier allows the switch to perform the multicast router (Mrouter) role and provide Mrouter
discovery when the network or virtual LAN (VLAN) does not have a router.
When IGMP Querier is enabled on a VLAN, the switch acts as an IGMP querier in a Layer 2
network environment. The IGMP querier periodically broadcasts IGMP Queries and listens for
hosts to respond with IGMP Reports indicating their IGMP group memberships. If multiple
Mrouters exist on a given network, the Mrouters elect one as the querier, which performs all
periodic membership queries. The election process can be based on IPv4 address or MAC address.
Note – When IGMP Querier is enabled on a VLAN, the switch performs the role of IGMP querier
only if it meets the IGMP querier election criteria.
Follow this procedure to configure IGMP Querier.
1. Enable IGMP and configure the source IPv4 address for IGMP Querier on a VLAN.
2. Enable IGMP Querier on the VLAN.
3. Configure the querier election type and define the address.
4. Verify the configuration.
RS G8124(config)# ip igmp enable
RS G8124(config)# ip igmp querier vlan 2 source-ip 10.10.10.1
RS G8124(config)# ip igmp querier vlan 2 querier
RS G8124(config)# ip igmp querier vlan 2 election-type ipv4
RS G8124# show ip igmp querier vlan 2
Current IGMP snooping Querier information:
IGMP Querier information for vlan 2:
Other IGMP querier - none
Switch-querier enabled, current state: Querier
Switch-querier type: Ipv4, address 10.10.10.1,
Switch-querier general query interval: 125 secs,
Switch-querier max-response interval: 100 'tenths of secs',
Switch-querier startup interval: 31 secs, count: 2
Switch-querier robustness: 2
IGMP configured version is v3
IGMP Operating version is v3