From: Brian Postma (brpostma-gs@xxxxxxxxx)
Date: Thu Apr 05 2001 - 23:26:04 GMT-3
I think you have to be careful using the area range command to solve this issue
. It can be used to
do this but it is conditional.
If you use the area range command to summarize an area that is directly connect
ed to the ASBR, the
summarized route will not get "injected" into the RIP/IGRP domain. The ip rout
ing table will not
have the /24 routes, only the routes on the "other side" of the ABR will have t
he summarized
route. So if the summarized area is not directly connected to the ASBR then th
e ASBR router will
have the /24 route in the ip routing table and thus it will get injected into R
IP/IGRP.
The same holds true with "summary-address" command. This will also solve the p
roblem as long as
the command is applied to the ASBR and it has a external network LSA for a subs
et of the summarized
address. But if these conditions are not met, the command does nothing.
Right?
There are tons of messages about this topic in the archive. Anyone game to wri
ting a FAQ about
this?
brian postma
Ya Wen wrote:
> > Q3. The /28 and /30 networks are not being redistributed into RIP domain as
expected.
> > There are two ways I know to fix the problem.
> > a. Define a static route with /24 mask on R4 and redistribute static;
> > b. Pass a default a default route to RIP domain by using "default informati
on-originate"
> > under RIP configuration.
> >
> > Are there other way to do it?
>
> Both will work. Or you can summarize the /28 and /30 networks into /24
> subnets using area range command and then redistribute them into RIP
> domain.
>
> Hope it helps
>
> -Ya
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