BigIron RX Series Configuration Guide 104953-1001810-01Chapter41Configuring IP Multicast Traffic ReductionIn this chapter• Enabling IP multicast traffic reduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 1050• PIM SM traffic snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1055• Displaying IP multicast information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1060The BigIron RX forwards all IP multicast traffic by default based on the Layer 2 information in thepackets. Optionally, you can enable the device to make forwarding decisions in hardware, based onmulticast group by enabling the IP Multicast Traffic Reduction feature.When this feature is enabled, the device examines the MAC address in an IP multicast packet andforward the packet only on the ports from which the device has received Group Membershipreports for that group, instead of forwarding all multicast traffic to all ports. The device sends trafficfor other groups out all ports.When you enable IP Multicast Traffic Reduction, you also can configure the following features:• IGMP mode – When you enable IP Multicast Traffic Reduction, the device passively listens forIGMP Group Membership reports by default. If the multicast domain does not have a router tosend IGMP queries to elicit these Group Membership reports, you can enable the device toactively send the IGMP queries.• Query interval – The query interval specifies how often the device sends Group Membershipqueries. This query interval applies only to the active IGMP mode. The default is 60 seconds.You can change the interval to a value from 10 – 600 seconds.• Age interval – The age interval specifies how long an IGMP group can remain in the IGMP grouptable without the device receiving a Group Membership report for the group. If the age intervalexpires before the device receives another Group Membership report for the group, the deviceremoves the entry from the table. The default is 140 seconds. You can change the interval toa value from 10 – 1220 seconds.Furthermore, when you enable IP Multicast Traffic Reduction, the device forwards all IP multicasttraffic by default but you can enable the device to do the following:• Forward IP multicast traffic only for groups for which the device has received a GroupMembership report.• Drop traffic for all other groups.The following sections describe how to configure IP multicast traffic reduction and PIM SM TrafficSnooping parameters on a BigIron RX.NOTEIP multicast traffic reduction and PIM SM Traffic Snooping is available on the BigIron RX.
