Dell Z9500 Configuration Manual page 570

Rate Limiting IGMP Join Requests
If you expect a burst of IGMP Joins, protect the IGMP process from being overload by limiting that rate at which new groups
can be joined.
Hosts whose IGMP requests are denied will use the retry mechanism built into IGMP so that they're membership is delayed
rather than permanently denied.
• Limit the rate at which new groups can be joined.
INTERFACE mode
ip igmp group-join-limit
To view the enable status of this failure, use the show ip igmp interface command from EXEC Privilege mode.
Preventing a PIM Router from Forming an Adjacency
To prevent a router from participating in PIM (for example, to configure stub multicast routing), use the following command.
• Prevent a router from participating in PIM.
INTERFACE mode
ip pim neighbor-filter
Preventing a Source from Registering with the RP
To prevent the PIM source DR from sending register packets to route processor (RP) for the specified multicast source and
group, use the following command. If the source DR never sends register packets to the RP, no hosts can ever discover the
source and create a shortest path tree (SPT) to it.
• Prevent a source from transmitting to a particular group.
CONFIGURATION mode
ip pim register-filter
In the following example, 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 570