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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
The default limit is 100K.
If the total number of sources received from the peer is already larger than the limit when this
configuration is applied, those sources are not discarded. To enforce the limit in such a situation, first
clear the SA cache.
Preventing MSDP from Caching a Local Source
You can prevent MSDP from caching an active source based on source and/or group. Because the
source is not cached, it is not advertised to remote RPs.
1. OPTIONAL: Cache sources that are denied by the redistribute list in the rejected SA cache.
CONFIGURATION mode
ip msdp cache-rejected-sa
2. Prevent the system from caching local SA entries based on source and group using an extended ACL.
CONFIGURATION mode
ip msdp redistribute list
Multicast Source Discovery Protocol (MSDP)
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