From: Richard Foltz (ccie2b@xxxxxxxxxx)
Date: Tue Oct 23 2001 - 15:35:40 GMT-3
It caused by the redistribution of the isdn link network into eigrp or igrp.
you can fix this one of two way. put a distribute list to block the router
for the isdn network going into ospf, or put no peer neighbor-route on both
side of the isdn link. either should fix it.
Richard Foltz, CCNP-Voice, CCDP, MCSE+I, Network+, A+
Sr. Network Engineer
ZettaWorks LLP.
3rd Attemp @ RTP 11/2-3
----- Original Message -----
From: "Paul Young" <tsungdapaulyoung@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, October 23, 2001 1:20 PM
Subject: ECP1 Excercise 3 ISDN up down problem
> Hi Group:
>
> I ran into some problems when doing ECP1 excercise
> 3 on ISDN between R1 and R2 which are both connected
> with Frame relay as well as ISDN DDR. The purpose is
> to configure R2's ISDN to backup its frame connection
> to R1 in case of link failure. R2's ISDN is
> configured with dialer profile and dialer-list
> protocol ip permit statment as well as ip ospf demand
> circuit. OSPF is running on both R1 & R2 as well as
> for the ISDN interfaces (network 172.16.12.0 0.0.0.255
> ara 0).
> The ISDN link on R2 initially comes up and establishes
> connection with R1 to do OSPF exchange. OSPF neighbor
> relationship was established between R1 & R2 via ISDN
> interface.
> However, when the dialer-idle timeout expires and the
> link disconnects, the link automatically restablish it
> self again (this happens over & over). Show dialer
> indicates it's initiated by R2's ISDN BRI interface
> 172.16.12.2 and the reason is 224.0.0.5 (which
> indicates the OSPF hello caused R2 to dial), but why
> didn't ip ospf demand circuit prevent this from
> happening? I'm having trouble keep the ISDN line
> quiet after initial connection. I've elminated
> possiblity of authentication issues already. When I
> disconnect R2's serial interface, ISDN works fine
> without this up and down and up symptom which leads me
> to believe maybe redistribution between OSPF & EIGRP
> on another router (R3) is causing this.
> Please help, thanks.
>
>
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