Cisco XR12000 Series Configuration Manual page 94

Controlling Source Information on MSDP Peer Routers
When receiving SA messages you can do the following:
• Filter all incoming SA messages from an MSDP peer
• Specify an extended access list to pass certain source/group pairs
• Filter based on match criteria in a route map
In addition, you can use time to live (TTL) to control what data is encapsulated in the first SA message for
every source. For example, you could limit internal traffic to a TTL of eight hops. If you want other groups
to go to external locations, you send those packets with a TTL greater than eight hops.
By default, MSDP automatically sends SA messages to peers when a new member joins a group and wants
to receive multicast traffic. You are no longer required to configure an SA request to a specified MSDP peer.
SUMMARY STEPS
1. configure
2. router msdp
3. sa-filter {in | out} {ip-address | peer-name} [list access-list-name] [rp-list access-list-name]
4. cache-sa-state [list access-list-name] [rp-list access-list-name]
5. ttl-threshold ttl-value
6. exit
7. ipv4 access-list name [sequence-number] permit source [source-wildcard]
8. Use the commit or end command.
DETAILED STEPS
Command or Action
Step 1
configure
Example:
RP/0/0/CPU0:router# configure
Step 2 router msdp
Example:
RP/0/0/CPU0:router(config)# router
msdp
Step 3 sa-filter {in | out} {ip-address | peer-name}
[list access-list-name] [rp-list
access-list-name]
Example:
RP/0/0/CPU0:router(config-msdp)#
sa-filter out router.cisco.com list
Cisco IOS XR Multicast Configuration Guide for the Cisco XR12000 Series Router, Release 5.1.x
84
Implementing Multicast Routing on Cisco IOS XR Software
Purpose
Enters global configuration mode.
Enters MSDP protocol configuration mode.
Configures an incoming or outgoing filter list for messages received from
the specified MSDP peer.
• If you specify both the list and rp-list keywords, all conditions must
be true to pass any source, group (S, G) pairs in outgoing
Source-Active (SA) messages.
• You must configure the ipv4 access-list command in
85.
Step 7, on page
OL-30405-02