Reference Guide

Multicast Features | 631
Preventing a PIM Router from Processing a Join
Permit or deny PIM Join/Prune messages on an interface using an extended IP access list. Use the
command
ip pim join-filter to prevent the PIM SM router from creating state based on multicast source and/
or group.
Note: Dell recommends that you do not use the ip pim join-filter command on an interface between a
source and the RP router. Use of this command in this scenario could cause problems with the PIM-SM
source registration process resulting in excessive traffic being sent to the CPU of both the RP and PIM DR
of the source.
Excessive traffic is generated when the join process from the RP back to the source is blocked due to a
new source group being permitted in the join-filter. This results in the new source becoming stuck in
registering on the DR and the continuous generation of UDP-encapsulated registration messages
between the DR and RP routers which are being sent to the CPU.