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Dell SmartFabric OS10 User Guide Release 10.5.3

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PIM join filters

The PIM join filter allows you to permit or deny PIM Join/Prune messages on an interface using an extended IP access list.

PIM router propagates (*, G) and (S,G) Join/Prune messages from its neighbors and creates multicast route to forward the traffic. This process can lead to PIM state explosion and high memory consumption when large numbers of PIM Join/Prune messages are forwarded to each router on the rendezvous point tree (RPT). Use PIM join filters to prevent the PIM-enabled routers from creating a multicast state and to limit multicast traffic in the network.

When the join filter is applied on the downstream interface, the effect on the outgoing interface happens at the maximum of Join/Prune-HoldTime value.

To configure join filter for IPv4 PIM-enabled interface, use the following command: 

ip pim join-filter <acl-name>

Configuration notes

  • Dell Technologies recommends not using the ip pim join-filter command on an interface between a source and the RP router. Using 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 generates 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 sent to the CPU.

  • Do not to configure a PIM join-filter on a source connected interface (IIF) on first hop router (FHR) node. Applying PIM join-filter with the rule, deny ip any any might block creation of the S,G entries.
  • When you configure a join filter, it applies for both incoming and outgoing joins. There is no option to specify in or out parameters while configuring a join filter.

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