Users Guide

vlan121 Forward/Sparse 13:07:53/Never
(101.1.1.10, 225.1.1.1), uptime 13:07:51, expires 00:06:09, flags: T
Incoming interface: vlan103, RPF neighbor 2.1.1.1
Outgoing interface list:
vlan121 Forward/Sparse 13:07:50/Never
Supported
Releases
10.4.3.0 or later
show ip rpf
Displays reverse path forwarding (RPF) information.
Syntax
show ip rpf [vrf vrf-name] [summary]
Parameters
● vrf vrf-name—Enter the keyword vrf, then the name of the VRF.
● summary—RPF summary.
Default None
Command Mode EXEC
Usage
Information
PIM uses unicast routing to check the multicast source reachability. PIM examines the distance of each
route. The route with the shortest distance is the one that PIM selects for reachability.
Example
OS10# show ip rpf
RPF information for 101.1.1.10
RPF interface: vlan103
RPF neighbor: 2.1.1.1
RPF route/mask: 101.1.1.0/255.255.255.0
RPF type: Unicast
RPF information for 171.1.1.1
RPF interface: vlan105
RPF neighbor: 3.1.1.1
RPF route/mask: 171.1.1.0/255.255.255.0
RPF type: Unicast
Supported
Releases
10.4.3.0 or later
Anycast RP using PIM
PIM Anycast RP provides load balancing and redundancy capabilities for Rendezvous Point (RP) routers in a multicast domain.
This feature allows you to configure two or more RPs with same IP address (RP address) in a multicast group. The shared RP
address is advertised in Interior Gateway Protocol (IGP). The RP routers that share the same RP address form an Anycast RP
set. Each router in the Anycast RP set is configured with two IP addresses: a shared RP address on the Loopback interface and
a separate, unique IP address. The unique IP address is used for communication between the RPs. The Loopback address must
be reachable to all PIM routers in the multicast domain. This configuration allows the RPs to share the load for source
registration and to act as back-up routers for each other.
PIM enables multiple RPs to inform each other about active sources. When a source registers with an RP, that RP sends a PIM
register message to all other members of the RP set informing that there is a new active source. Thus, each RP in the multicast
domain knows about the active sources of the other RPs.
IGP protocols such as OSPF routes the sources and receivers to the RPs with the best route. Packets sent to the RP address
are delivered to the nearest RP with this address. When an RP with the best route fails, IGP automatically recalculates the best
route and takes the sources and receivers to the closest operating RP. This failover mechanism ensures that connectivity is
maintained, and traffic disruption is minimal.
NOTE: PIM Anycast RP is not supported on the S3048-ON switch.
Multicast 1081