Chapter 41 Configuring Ip Multicast Traffic Reduction - Dell PowerConnect B-RX Configuration Manual

Configuring IP Multicast Traffic Reduction
The BigIron RX forwards all IP multicast traffic by default based on the Layer 2 information in the
packets. Optionally, you can enable the device to make forwarding decisions in hardware, based on
multicast 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 and
forward the packet only on the ports from which the device has received Group Membership
reports for that group, instead of forwarding all multicast traffic to all ports. The device sends traffic
for other groups out all ports.
When you enable IP Multicast Traffic Reduction, you also can configure the following features:
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Furthermore, when you enable IP Multicast Traffic Reduction, the device forwards all IP multicast
traffic by default but you can enable the device to do the following:
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The following sections describe how to configure IP multicast traffic reduction and PIM SM Traffic
Snooping parameters on a BigIron RX.
NOTE
IP multicast traffic reduction and PIM SM Traffic Snooping is available on the BigIron RX.
BigIron RX Series Configuration Guide
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IGMP mode – When you enable IP Multicast Traffic Reduction, the device passively listens for
IGMP Group Membership reports by default. If the multicast domain does not have a router to
send IGMP queries to elicit these Group Membership reports, you can enable the device to
actively send the IGMP queries.
Query interval – The query interval specifies how often the device sends Group Membership
queries. 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 group
table without the device receiving a Group Membership report for the group. If the age interval
expires before the device receives another Group Membership report for the group, the device
removes the entry from the table. The default is 140 seconds. You can change the interval to
a value from 10 – 1220 seconds.
Forward IP multicast traffic only for groups for which the device has received a Group
Membership report.
Drop traffic for all other groups.
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