From: Annu Roopa (annu_roopa@xxxxxxxxx)
Date: Fri Jun 28 2002 - 11:10:50 GMT-3
Folks,
First of all thanks to all who took time to reply.Here
is what i observed.There are two ways to do it.Both do
the same thing.
The second way works and the backdoor STILL IS NOT
WORKING AS EXPECTED.THE IOS verison is 12.1(5)T on all
routers.
1.Use the BGP back door on R2 using 'backdoor
175.10.10.0' on r2. This is preferred way.
This command tells BGP to force the preferred BGP path
of 172.16.1.0 to AD=200 and considers the iGRP path
with 100.But this is also considers the network 175.10
as local and does not advertise it....assume a router
connected to R10 with Ebgp.this router will not use
this IGP link thru R2/R12 and instaed use the R10-r12
link which is what is expected. Look into doyle 2 for
more details.
2.Use the Network command under BGP process as 'net
175.10.10.0' on R2 as some said.This too works but
unlike the above it advertises this path to R10 and
its ext neighbors and they could be using the r2-r12
IGP path which is not preferred. Refer Doyle II.
Bcoz 175.10 is in the R2 BGP table it advertises it
with network command and sets the Ad to 200 and
prefers the IGRP path over eBGP path.
Hope that helps. I have tried rebooting and
re-intializing BGP no luck.MAYBE this is a bug or ???
Anyone else with ideas.
=====
Thanks in advance for ur time and replies.
Annu.
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