> LISP is different from GRE and L3VPN because it pulls mapping information to 
> itself. By contrast, GRE mapping information is generally configured 
> statically. L3VPN mapping information is pushed by BGP. Therefore, LISP must 
> deal with the problems of stale mapping information and cache misses. Also, 
> LISP must deal with the problem of egress encapsulation node liveness.

Ron, I have to keep you honest here. It doesn't matter if you pull or push, ANY 
information that is distributed can be stale. 

If a route changes in BGP and there is a congested path and the Update is 
continually being retransmitted by TCP to get to the BGP peer, that BGP peer 
has stale information.

Dino

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