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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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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

DellEMC(conf)#ip msdp peer 10.0.50.2 connect-source Vlan 50
DellEMC(conf)#ip msdp default-peer 10.0.50.2 list fifty

DellEMC(conf)#ip access-list standard fifty
DellEMC(conf)#seq 5 permit host 200.0.0.50

DellEMC#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

DellEMC#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

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