BigIron RX Series Configuration Guide 57753-1001986-01Changing IGMP V1 and V2 parameters 23Changing IGMP V1 and V2 parametersIGMP allows Brocade routers to limit the multicast of IGMP packets to only those ports on therouter that are identified as IP Multicast members.The router actively sends out host queries to identify IP Multicast groups on the networkThe following IGMP V1 and V2 parameters apply to PIM and DVMRP:• IGMP query interval – Specifies how often the BigIron RX queries an interface for groupmembership. Possible values are 1 – 3600. The default is 125.• IGMP group membership time – Specifies how many seconds an IP Multicast group can remainon a BigIron RX interface in the absence of a group report. Possible values are 1 – 7200. Thedefault is 260.• IGMP maximum response time – Specifies how many seconds the BigIron RX will wait for anIGMP response from an interface before concluding that the group member on that interface isdown and removing the interface from the group. Possible values are 1 – 10. The default is 10.To change these parameters, you must first enable IP multicast routing by entering the following CLIcommand at the global CLI level.BigIron RX(config)# ip multicast-routingSyntax: [no] ip multicast-routingNOTEYou must enter the ip multicast-routing command before changing the global IP Multicastparameters. Otherwise, the changes do not take effect and the software uses the default values.Also, entering no ip multicast-routing will reset all parameters to their default values.Modifying IGMP (V1 and V2) query interval periodThe IGMP query interval period defines how often a router will query an interface for groupmembership. Possible values are 1 – 3,600 seconds and the default value is 125 seconds.To modify the default value for the IGMP (V1 and V2) query interval, enter the following.BigIron RX(config)# ip igmp query 120Syntax: ip igmp query-interval <1-3600>Modifying IGMP (V1 and V2) membership timeGroup membership time defines how long a group will remain active on an interface in the absenceof a group report. Possible values are from 1 – 7200 seconds and the default value is 260seconds.To define an IGMP (V1 and V2) membership time of 240 seconds, enter the following.BigIron RX(config)# ip igmp group-membership-time 240Syntax: ip igmp group-membership-time <1-7200>
