79
CONFIDENTIAL
26-Jan-04
© 2002 Procket Networks, Inc. All rights reserved.
RPF Check Example
AS1
MSDP/iMBGP mesh-peering
MSDP SA
MBGP Table router B
A Destination        Next hop        Path
* 172.16.0.2/32      >172.16.3.1     i
3.1
4.2
4.1
2.1
MSDP Peers router B
Peer Address    State/PfxRcd
172.16.3.1      1
172.16.4.1      1
Who is the iMBGP peer adverting this route?
In our example 172.16.3.1
Is the MSDP == MBGP peer?
RPF Failure!
Src
RP
A
C
B
RPF rule when MSDP peer == iMBGP peer
ip pim rp-address 172.16.0.2