From: Lekan Magbagbeola (lekkyl@xxxxxxxxxxx)
Date: Wed Jul 17 2002 - 02:50:15 GMT-3
Initially Clicked on send button by mistake. Here is the full text.
By default, Cisco IOS installs host routes on a point-to-point link when
PPP IPCP is being negotiated between two peers (in this case your ISDN
routers). This creates a potential problem in an ISDN environment:
Assume you have two routers R1 and R2 connected in the following scenario
IGRP domain)R1<==OSPF==>R2
10.1.1.0/24 10.1.2.0/24
both R1 and R2 installs a host route (10.1.2.2/32 and 10.1.2.1/32
respectively) for each connected peer, and you redistribute IGRP domain
into OSPF on R1. Since IGRP is a classful network, this is redistributed
as 10.0.0.0 classful network into OSPF and so router R2 assume that IGRP
owns this network.
With ospf demand circuit configured bewteen this routers, when the link
between this peers goes down as a result of ospf demand circuit
configured between them, the host routes (/32s)disappears and OSPF sees
this as a topology change, consequentlly, the ISDN interfaces are brought
up and connected. This keeps going on and on and keeps the BRI interfaces
from staying quiet.
So to avoid this in an OSPF demand circuit environment, you would want to
put the command "no peer neighbor-route" on the BRI interfaces of the two
routers.
'Just my two cents.
Lekan
>From: todd123@ms1.hinet.net >Reply-To: todd123@ms1.hinet.net >To:
ccielab@groupstudy.com >Subject: no peer neighbor-route question ! >Date:
Wed, 17 Jul 2002 09:39:43 +0800 (CST) > >[demime could not interpret
encoding binary - treating as plain text] > Hi, > > I saw some bri
interface config with " no peer neighbor-route " > command. Anybody know
what is peer neighbor-route behavior ? > > Thanks! > > Todd Hsieh
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