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Implementing Multicast Routing on Cisco IOS XR Software
Command or Action
Step 4
core-tree-protocol rsvp-te group-list name
Example:
RP/0/RP0/CPU0:router(config-mcast-default-ipv4)#
core-tree-protocol rsvp-te group-list acl1
Step 5
commit
Configuration Examples for Implementing Multicast Routing on
Software
This section provides the following configuration examples:
MSDP Anycast RP Configuration on Cisco IOS XR Software: Example
Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and to act
as hot backup routers for each other. MSDP is the key protocol that makes Anycast RP possible.
In Anycast RP, two or more RPs are configured with the same IP address on loopback interfaces. Configure
the Anycast RP loopback address with a 32-bit mask, making it a host address. Configure all downstream
routers to "know" that the Anycast RP loopback address is the IP address of the local RP. IP routing
automatically selects the topologically closest RP for each source and receiver.
As a source may register with one RP and receivers may join to a different RP, a method is needed for the
RPs to exchange information about active sources. This information exchange is done with MSDP.
In Anycast RP, all the RPs are configured to be MSDP peers of each other. When a source registers with one
RP, a Source-Active (SA) message is sent to the other RPs, informing them that there is an active source for
a particular multicast group. The result is that each RP knows about the active sources in the area of the other
RPs. If any of the RPs fails, IP routing converges and one of the RPs becomes the active RP in more than one
area. New sources register with the backup RP, and receivers join the new RP.
Note that the RP is usually needed only to start new sessions with sources and receivers. The RP facilitates
the shared tree so that sources and receivers can directly establish a multicast data flow. If a multicast data
flow is already directly established between a source and the receiver, an RP failure does not affect that session.
Anycast RP ensures that new sessions with sources and receivers can begin at any time.
The following Anycast RP example configures Router A and Router B as Anycast RPs. The Anycast RP IP
address assignment is 10.0.0.1.
Router A
interface loopback 0
ipv4 address 10.0.0.1/32
no shutdown
interface loopback 1
Configuration Examples for Implementing Multicast Routing on Software
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
Purpose
Enters the core-tree-protocol configuration
mode.
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