Users Guide

Specifying Source-Active Messages
To specify messages, use the following command.
• Specify the forwarding-peer and originating-RP from which all active sources are accepted without regard
for the RPF check.
CONFIGURATION mode
ip msdp default-peer ip-address list
If you do not specify an access list, the peer accepts all sources that peer advertises. All sources from RPs
that the ACL denies are subject to the normal RPF check.
Example of the ip msdp default-peer Command and Viewing Denied Sources
Dell(conf)#ip msdp peer 10.0.50.2 connect-source Vlan 50
Dell(conf)#ip msdp default-peer 10.0.50.2 list fifty
Dell(conf)#ip access-list standard fifty
Dell(conf)#seq 5 permit host 200.0.0.50
Dell#ip msdp sa-cache
MSDP Source-Active Cache - 3 entries
GroupAddr SourceAddr RPAddr LearnedFrom Expire UpTime
229.0.50.2 24.0.50.2 200.0.0.50 10.0.50.2 73 00:13:49
229.0.50.3 24.0.50.3 200.0.0.50 10.0.50.2 73 00:13:49
229.0.50.4 24.0.50.4 200.0.0.50 10.0.50.2 73 00:13:49
Dell#ip msdp sa-cache rejected-sa
MSDP Rejected SA Cache
3 rejected SAs received, cache-size 32766
UpTime GroupAddr SourceAddr RPAddr LearnedFrom Reason
00:33:18 229.0.50.64 24.0.50.64 200.0.1.50 10.0.50.2 Rpf-Fail
00:33:18 229.0.50.65 24.0.50.65 200.0.1.50 10.0.50.2 Rpf-Fail
00:33:18 229.0.50.66 24.0.50.66 200.0.1.50 10.0.50.2 Rpf-Fail
Limiting the Source-Active Messages
from a Peer
To limit the source-active messages from a peer, use the following commands.
1 OPTIONAL: Store sources that are received after the limit is reached in the rejected SA cache.
CONFIGURATION mode
ip msdp cache-rejected-sa
2 Set the upper limit for the number of sources allowed from an MSDP peer.
CONFIGURATION mode
ip msdp peer peer-address sa-limit
Multicast Source Discovery Protocol (MSDP) 688