From: Phil (ciscostudent1@xxxxxxxxxxxx)
Date: Mon Feb 11 2002 - 15:14:44 GMT-3
I don't have the book here with me but I believe each domain belongs to a diff
erent main classful network. This solution wouldn't work it both IGRP and RIP a
re subnetting the same main classful network.
Phil.
Steven Weber <itweber@earthlink.net> escreveu: I was doing the configuration
exercises on page 739 in Doyle Vol. I and I came
across something very strange that he doesn't explain well and I was wondering
if someone could help me out. In exercise #1 they ask you to redistribute
between IGRP and RIP with different masks. So what I first thought to do was
to make static routes and redistribute those into the IGP's and that should do
it. To my surprise, the static routes never made it to the other routers so
they had no static routes to the other domain. But the really freaky part of
the whole thing is the solution Doyle himself gives. He suggests that you
change the subnet mask on one of the links on the redistributing router to
match the other protocol. To me this seemed very surprising. I never came
across a situation before where you would have two routers on the same link
with mismatched subnets. Anyway, his solution worked and I was wondering if
someone could offer me a simple explanation as to why ? And why if this works
do we always bother with summarizing addresses in the other domain so that the
classful protocol should understand them, this seems like a much more simple
solution?
Regards,
Steve
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