From: Ya Wen (ywen@xxxxxxxxxxxxxxxxxxxxxx)
Date: Thu Feb 08 2001 - 22:39:55 GMT-3
Hi,all:
Just right at the time that I think I already knew EIGRP pretty well, I
got confused again and have the following two questions regarding of
EIGRP:
(1). What is poison advertise from EIGRP point of view? From debug info, I
found out the classful route was "poison advertised" out of the interface
which has a different subnet mask in the same classful network. But the
classful network route never get applied to the routing table of other
routers in the same EIGRP domain.
(2). When exactly will EIGRP generate a summary route of a classful
network pointing to NULL 0 and inject it into the EIGRP domain? Let's
assume that auto summary is by default enabled here. I understand if all
the interfaces on the router belong to the same classful network with or
without the same subnet masks, there will be no summary route created,
cause there is no "network boundary", but what if the router has three
interfaces, one belongs to a class B network with a /24 subnet,the other
two interfaces belong to a different class B network with /27 subnet mask.
Will EIGRP generate two classful network routes pointing to NULL0 in this
case? I would expect so, but in my test lab, I saw sometimes it occured,
but sometimes it did not, I am trying to figure out what's the rule here.
This is very important when we are doing summarization and redistribution
between multiple protocols.
Thanks!
-Ya
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