Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 449
Rate Limit IGMP Join Requests, Prevent a PIM Router from Forming an Adjacency, Prevent a Source
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Rate Limit IGMP Join Requests If you expect a burst of IGMP Joins, protect the IGMP process from overload by limiting that rate at which new groups can be joined using the command ip igmp group-join-limit from INTERFACE mode. Hosts whose IGMP requests are denied will use the retry mechanism built-in to IGMP so that they're membership is delayed rather than permanently denied. View the enable status of this feature using the command show ip igmp interface from EXEC Privilege mode. Prevent a PIM Router from Forming an Adjacency To prevent a router from participating in Protocol Independent Multicast (PIM) (for example, to configure stub multicast routing), use the ip pim neighbor-filter command from INTERFACE mode. Prevent a Source from Registering with the RP Use the command ip pim register-filter from CONFIGURATION mode to prevent a source from transmitting to a particular group. This command prevents the PIM source DR from sending register packets to RP for the specified multicast source and group; if the source DR never sends register packets to the RP, no hosts can ever discover the source and create an SPT to it. In Figure 23-3, Source 1 and Source 2 are both transmitting packets for groups 239.0.0.1 and 239.0.0.2. R3 has a PIM register filter that only permits packets destined for group 239.0.0.2. An entry is created for group 239.0.0.1 in the routing table, but no outgoing interfaces are listed. R2 has no filter, so it is allowed to forward both groups. As a result, Receiver 1 receives only one transmission, while Receiver 2 receives duplicate transmissions. Multicast Features | 449
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