Users Guide

2. Configure an Ethernet interface. This command enables INTERFACE configuration mode.
OS10(config)# interface ethernet 1/1/1
3. Configure a filter that applies the previously created ACL (pim_nbr_filter) to the PIM interface.
OS10(conf-if-eth1/1/1)# ip pim neighbor-filter pim_nbr_filter
PIM register filters
The PIM register filter prevents the PIM source Designated Router (DR) from sending register packets to a Rendezvous Point
(RP) for the specified multicast source and group. When the register packets are blocked, the RP cannot learn (S,G) and
therefore cannot pull the traffic from the source and forward it to downstream routers and receivers. Thus, the unauthorized
groups and sources are prevented from registering with an RP router.
You can apply register message filters on an FHR (DR) to control outgoing register messages or apply them on an RP to control
incoming register messages. When the register filter is applied on the FHR or RP node, it does not affect the Shortest Path Tree
(SPT) created using the IGMPv3 joins.
To configure register filter for IPv4 PIM, use the following command:
ip pim [vrf <vrf-name>] register-filter <acl-name>
To view details of the configured PIM register filters, use the following command:
show ip pim [vrf <vrf-name>] register-filter <group address> <source address>
Configure PIM register filters
Before you configure a PIM register filter, enable multicast routing globally and establish PIM neighborship between routers.
To configure an ACL that is used for a register filter:
1. Configure an ACL in CONFIGURATION mode. You can specify the ACL name up to 140 characters.
OS10# configure terminal
OS10(config)# ip access-list pim_reg_filter
OS10(config-ipv4-acl)# permit ip 10.10.10.2/32 any
The PIM register filter uses both source and group information from the access-list for filtering register messages.
2. Configure a register filter that applies the previously created ACL (pim_reg_filter) in the default or nondefault VRF.
OS10(config)# ip pim vrf vrf_dell register-filter pim_reg_filter
In this example, the register filter is configured in a nondefault VRF named vrf_dell.
PIM commands
clear ip pim rp-mapping
Clears group-to-RP mapping entries from the RP mapping cache.
Syntax
clear ip pim [vrf vrf-name] rp-mapping [ip-address]
Parameters
● vrf vrf-name—Enter vrf, then the name of the VRF to clear the PIM RP mapping entries
corresponding to that VRF.
If you do not specify the VRF name, the system clears the entries from the default VRF.
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