660 BigIron RX Series Configuration Guide53-1002253-01Configuring IP multicast traffic reduction23• Passive – When passive IGMP mode is enabled, the device listens for IGMP GroupMembership reports but does not send IGMP queries. The passive mode is sometimes called“IGMP snooping”. Use this mode when another device in the network is actively sendingqueries.To enable active IGMP, enter the following command.BigIron RX(config)# ip multicast activeBigIron RX(config)# write memoryBigIron RX(config)# endBigIron RX# reloadSyntax: [no] ip multicast active | passiveTo enable passive IGMP, enter the following command.BigIron RX(config)# ip multicast passiveBigIron RX(config)# write memoryBigIron RX(config)# endBigIron RX# reloadModifying the query intervalIf IP Multicast Traffic Reduction is set to active mode, you can modify the query interval, whichspecifies how often a BigIron RX enabled for active IP Multicast Traffic Reduction sends GroupMembership queries.NOTEThe query interval applies only to the active mode of IP Multicast Traffic reduction.To modify the query interval, enter a command such as the following.BigIron RX(config)# ip multicast query-interval 120Syntax: [no] ip multicast query-interval The parameter specifies the interval between queries. You can specify a value from 10 –600 seconds. The default is 60 seconds.Modifying the age intervalWhen the device receives a Group Membership report, the device makes an entry in the IGMPgroup table for the group in the report. The age interval specifies how long the entry can remain inthe table without the device receiving another Group Membership report.To modify the age interval, enter a command such as the following.BigIron RX(config)# ip multicast age-interval 280Syntax: [no] ip multicast age-interval The parameter specifies the interval between queries. You can specify a value from 10 –1220 seconds. The default is 260 seconds.Filtering multicast groupsBy default, the BigIron RX forwards multicast traffic for all valid multicast groups. You can configurea BigIron RX to filter out all multicast traffic for groups other than the ones for which the device hasreceived Group Membership reports.
