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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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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

Example of Verifying the System is not Caching Local Sources

When you apply this filter, the SA cache is not affected immediately. When sources that are denied by the ACL time out, they are not refreshed. Until they time out, they continue to reside in the cache. To apply the redistribute filter to entries already present in the SA cache, first clear the SA cache. You may optionally store denied sources in the rejected SA cache. 
R1_E600(conf)#do show run msdp
                                 !
                                 ip multicast-msdp
                                 ip msdp peer 192.168.0.3 connect-source Loopback 0
                                 ip msdp redistribute list mylocalfilter
                                 ip msdp cache-rejected-sa 1000
                                 R1_E600(conf)#do show run acl
                                 !
                                 ip access-list extended mylocalfilter
                                 seq 5 deny ip host 239.0.0.1 host 10.11.4.2
                                 seq 10 deny ip any any
                                 R1_E600(conf)#do show ip msdp sa-cache
                                 R1_E600(conf)#do show ip msdp sa-cache rejected-sa
                                 MSDP Rejected SA Cache
                                 1 rejected SAs received, cache-size 1000
                                 UpTime    GroupAddr  SourceAddr  RPAddr       LearnedFrom  Reason
                                 00:02:20  239.0.0.1  10.11.4.2   192.168.0.1  local        Redistribute

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