From: Martin, Chris (chris@xxxxxxxxxxxx)
Date: Tue Oct 23 2001 - 15:49:13 GMT-3
Hi Paul:
I took ECP I and how i prevented this was in my dialer-list 1 i
assigned a access-list blocking ospf hello packets (224.0.0.5) This kept the
link down until the serial interface was shutdown (In which the exercise
requests the bri come up when serial is down) and everything worked fine. I
did have some issues with the authentication but thanks to Rick my
instructor i was able to iron out the issues...
anyway HTH
-C
----- Original Message -----
From: "Paul Young" <tsungdapaulyoung@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, October 23, 2001 11:20 AM
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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