From: Paul Young (tsungdapaulyoung@xxxxxxxxx)
Date: Tue Oct 23 2001 - 15:20:40 GMT-3
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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