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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 Remote Source

To prevent MSDP from caching a remote source, use the following commands.

  1. OPTIONAL: Cache sources that the SA filter denies in the rejected SA cache. CONFIGURATION mode ip msdp cache-rejected-sa
  2. Prevent the system from caching remote sources learned from a specific peer based on source and group. CONFIGURATION mode ip msdp sa-filter list out peer list ext-acl

Example of Verifying the System is not Caching Remote Sources

As shown in the following example, R1 is advertising source 10.11.4.2. It is already in the SA cache of R3 when an ingress SA filter is applied to R3. The entry remains in the SA cache until it expires and is not stored in the rejected SA cache.
[Router 3]
                                 R3_E600(conf)#do show run msdp
                                 !
                                 ip multicast-msdp
                                 ip msdp peer 192.168.0.1 connect-source Loopback 0
                                 ip msdp sa-filter in 192.168.0.1 list myremotefilter
                                 R3_E600(conf)#do show run acl
                                 !
                                 ip access-list extended myremotefilter
                                 seq 5 deny ip host 239.0.0.1 host 10.11.4.2
                                 R3_E600(conf)#do show ip msdp sa-cache
                                 MSDP Source-Active Cache - 1 entries
                                 GroupAddr  SourceAddr  RPAddr       LearnedFrom  Expire  UpTime
                                 239.0.0.1  10.11.4.2   192.168.0.1  192.168.0.1  1       00:03:59
                                 R3_E600(conf)#do show ip msdp sa-cache
                                 R3_E600(conf)#
                                 R3_E600(conf)#do show ip msdp peer
                                 
                                 Peer Addr: 192.168.0.1
                                 Local Addr: 0.0.0.0(639) Connect Source: Lo 0
                                 State: Listening Up/Down Time: 00:01:19
                                 Timers: KeepAlive 30 sec, Hold time 75 sec
                                 SourceActive packet count (in/out): 0/0
                                 SAs learned from this peer: 0
                                 SA Filtering:
                                 Input (S,G) filter: myremotefilter
                                 Output (S,G) filter: none
                              

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