Juniper Networks EX2500 - Manual (Page 91)

IGMP Querier „ 77
Chapter 7: IGMP
The IGMP version is set for each VLAN, and cannot be configured separately for
each Mrouter.
2. Verify the configuration.
ex2500(config)# show ip igmp mrouter
IGMP Querier
When a network or VLAN does not have a router to handle the Mrouter role and
provide Mrouter discovery on switches, the IGMP Querier feature allows the
EX2500 switch to perform that function.
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.
Follow this procedure to configure IGMP Querier.
1. Configure IGMP Snooping on a VLAN interface.
ex2500(config)# ip igmp snoop source-ip vlan 2 10.10.10.1
2. Enable IGMP Querier on the VLAN.
ex2500(config)# ip igmp querier vlan 2 querier
ex2500(config-vlan)# enable
3. Configure the querier election type and define the address.
ex2500(config-vlan)# ip igmp querier vlan 2 querier-type ipv4 20.20.20.1
ex2500(config-vlan)# exit
4. Verify the configuration.
ex2500(config)# show ip igmp querier vlan 2
Current IGMP snooping Querier information:
IGMP Snooping information for vlan 100:
IGMP querier none
Switch-querier enabled, currently running
Switch-querier type: IPv4, address 10.10.10.1,
Switch-querier query interval: 125 secs,
Switch-querier startup interval: 3 secs, count: 4
Switch-querier robustness: 2
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.