Limiting The Source-Active Messages From A Peer; Preventing Msdp From Caching A Local Source - Dell S4820T Configuration Manual

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
229.0.50.2 24.0.50.2
229.0.50.3 24.0.50.3
229.0.50.4 24.0.50.4
Dell#ip msdp sa-cache rejected-sa
MSDP Rejected SA Cache
3 rejected SAs received, cache-size 32766
UpTime GroupAddr
00:33:18 229.0.50.64
00:33:18 229.0.50.65
00:33:18 229.0.50.66

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.
632
RPAddr LearnedFrom
200.0.0.50 10.0.50.2
200.0.0.50 10.0.50.2
200.0.0.50 10.0.50.2
SourceAddr RPAddr
24.0.50.64 200.0.1.50
24.0.50.65 200.0.1.50
24.0.50.66 200.0.1.50
Expire UpTime
73 00:13:49
73 00:13:49
73 00:13:49
LearnedFrom Reason
10.0.50.2 Rpf-Fail
10.0.50.2 Rpf-Fail
10.0.50.2 Rpf-Fail
Multicast Source Discovery Protocol (MSDP)