Reference Guide

Multicast Features | 683
Prevent 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.
IPv6 Multicast Policies
IPv6 Multicast Policies is available only on platform: e
• Limit the Number of IPv6 Multicast Routes on page 683
• Prevent an IPv6 Neighbor from Forming an Adjacency on page 684
• Prevent an IPv6 Source from Registering with the RP on page 684
• Prevent an IPv6 PIM Router from Processing an IPv6 Join on page 684
Limit the Number of IPv6 Multicast Routes
You can limit the total number of IPv6 multicast routes on the system. The maximum number of multicast
entries allowed on each line card is determined by the CAM profile. Multicast routes are stored in the
IN-V6-McastFib CAM region, which has a fixed number of entries. Any limit configured via the CLI is
superseded by this hardware limit. The opposite is also true; the CAM might not be exhausted at the time
the CLI-configured route limit is reached.
Note: Dell Force10 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.
Task Command Syntax Command Mode
Limit the total number of IPv6 multicast routes on the
system.
ipv6 multicast-limit
Range: 1-50000
Default: 15000
CONFIGURATION