[j-nsp] MSDP

[Leonard Giuliano]

Either can be made to work.  Just as in the case of BGP, the disadvantage 
of peering with the physical address is that if the interface goes down, 
so too will the session.  So you may want to follow the same rule of thumb 
used in BGP- internal peerings with loopback, external with physical 
interface.

The more important implication is for Peer-RPF, which will care which 
address you use.  Whatever address is used must satisfy the RPF rules.

Hope this helps,
Lenny

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?
-) 
-)  
-) 
-) Any input and justification for one way or the other would be really
-) appreciated.  Thx.
-) 
-)  
-) 
-) -mike
-) 
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