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.
commit
DETAILED STEPS
Purpose
Command or Action
configure
Step 1
Enters MSDP protocol configuration mode.
router msdp
Example:
RP/0/RP0/CPU0:router(config)# router
Step 2
msdp
Configures an incoming or outgoing filter list for messages received
from the specified MSDP peer.
sa-filter
{
in
|
out
} {
ip-address
|
peer-name
}
[
list access-list-name
] [
rp-list
access-list-name
]
Step 3
•
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.
Example:
RP/0/RP0/CPU0:router(config-msdp)#
•
You must configure the
ipv4 access-list
command in
Step 7, on
page 126
.
sa-filter out router.cisco.com list 100
•
If all match criteria are true, a
permit
from the route map passes
routes through the filter. A
deny
filters routes.
•
This example allows only (S, G) pairs that pass access list 100 to
be forwarded in an SA message to the peer named router.cisco.com.
Creates and caches source/group pairs from received Source-Active (SA)
messages and controls pairs through access lists.
cache-sa-state
[
list access-list-name
] [
rp-list
access-list-name
]
Example:
RP/0/RP0/CPU0:router(config-msdp)#
Step 4
cache-sa-state 100
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
125
Implementing Multicast Routing on Cisco IOS XR Software
Controlling Source Information on MSDP Peer Routers