[j-nsp] MSDP

Mohacsi Janos mohacsi at niif.hu
Thu Aug 11 10:12:57 EDT 2005

On Thu, 11 Aug 2005, Roberts, Michael J. (IATS) wrote:

> I have a multicast question for everyone.
> So I have two peering routers that are connected back to back over a
> GigE interface.  Each interface is configured with an IP address.  BGP
> is peering directly with the interfaces.  PIM is running on the
> interfaces, and the routers see each other as PIM neighbors.  Each
> router is configured with a loopback address.
> When MSDP is configured, should it be configured to peer with the
> neighbor's interface IP, or the loopback IP, or does it really make any
> difference?  Also, would it make a difference, if one side was
> configured to peer with the interface IP and the other side was
> configured to peer with the neighboring router's loopback?

Rule of thumb:
configure MSDP with the same address as you use for mBGP - except if you 
have non-congruent topology but beware MSDP RPF might fail....

See more:

and RFC 3618


Janos Mohacsi
Network Engineer, Research Associate
Key 00F9AF98: 8645 1312 D249 471B DBAE  21A2 9F52 0D1F 00F9 AF98

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