81
CONFIDENTIAL
26-Jan-04
© 2002 Procket Networks, Inc. All rights reserved.
RPF Check Example
AS1
AS 2
AS3
MSDP/eMBGP mesh-peering
MSDP SA
BGP Table
Destination       Next Hop     Path
* 172.16.0.2/32   >172.16.3.1    1 i
  172.16.0.2/32    172.16.4.1    3 1 i
3.1
4.2
4.1
2.1
MSDP Peers router B
MSDP Peer      State
172.16.3.1     Established
172.16.4.1     Established
Who is the BGP peer adverting this route
BGP Neighbours router B
Neighbor     AS                                       172.16.3.1   1
172.16.4.1   3
RPF Failure!
RP
RPF rule when MSDP == MBGP peer
Is the AS of the sending MSDP peer  == First AS in RP route?
A
C
B
ip pim rp-address 172.16.0.2
Src