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7.8.1.0 - Force10 Networks

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Rate Limit IGMP Join Requests<br />

If you expect a burst of IGMP Joins, protect the IGMP process from overload by limiting that rate at which<br />

new groups can be joined using the command ip igmp group-join-limit from INTERFACE mode. Hosts<br />

whose IGMP requests are denied will use the retry mechanism built-in to IGMP so that they’re<br />

membership is delayed rather than permanently denied.<br />

View the enable status of this feature using the command show ip igmp interface from EXEC Privilege<br />

mode.<br />

Prevent a PIM Router from Forming an Adjacency<br />

To prevent a router from participating in Protocol Independent Multicast (PIM) (for example, to configure<br />

stub multicast routing), use the ip pim neighbor-filter command from INTERFACE mode.<br />

Prevent a Source from Transmitting to a Group<br />

Use the command ip pim register-filter from CONFIGURATION mode to prevent a source from<br />

transmitting to a particular group. This command prevents the PIM source DR from sending register<br />

packets to RP for the specified multicast source and group; if the source DR never sends register packets to<br />

the RP, no hosts can ever discover the source and create an SPT to it.<br />

FTOS Configuration Guide, version <strong>7.8.1.0</strong> 503

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