Alvin,
If I'm not mistaken you BRI circuits should have two(2) channels.
Why not simply set R1 to dial the core on the
1st channel and R2 on the 2nd. Of course you would have to change the
configuration on your core router for to support Dialer Profiles
so you could receive both calls simultaneously If made the config
additions you'll need below. I don't know what routing protocol
you're using if any so I'd suggest using floating statics so as long as the
primary path is down the ISDN circuit will
be the default path out of the network. If there's a dynamic routing
protocol(I'm thinking based on the "broadcast" keyword in the BRI config)
already running between the "core" router and R1 and R2, I'm assuming the
ISDN isn't configured based on you're use of the "backup interface"
command. Anyway, just some thoughts and things to consider... NOTE: ***
You could look at creating a loopback interface on the core router
and using the "ip unnumbered loopback" command under the dialer profiles
for each connection this way you maintain the existing IP scheme.
The configs for R1 and R2 should stay pretty much the same except R1 will
use the # for BRI line 1 on the CORE router and R2 will use the 2nd..
Router_CORE
interface BRI4/0
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
ppp authentication chap
hold-queue 75 in
interface Dialer1
dialer string
dialer-group 1
dialer pool 1
isdn switch-type basic-net3
ppp authentication chap
hold-queue 75 in
b
interface Dialer1
dialer string
dialer-group 2
dialer pool 1
isdn switch-type basic-net3
ppp authentication chap
hold-queue 75 in
dialer-list 1 protocol ip permit
dialer-list 2 protocol ip list 101
access-list 101 permit ip any any
----- Original Message -----
From: "Alvin Chong"
To:
Sent: Thursday, September 13, 2001 10:41 PM
Subject: ISDN backup problem [7:19894]
> Hi all,
>
> I have a core router connected to 2 other regional
> routers, with only 1 ISDN backup. The config is as
> below:
>
> Unfortunately these 2 regional routers down at the
> same time and both keep trying to dial up the ISDN
> line. The result is both of them unable to get the
> connection. What should I do at the very first step?
> Pls advice. Thanks
>
> Router1
>
> interface Serial0/0
> backup delay 0 10
> backup interface BRI0/0
> ip address 172.200.100.50 255.255.255.252
> no ip mroute-cache
> service-policy output llq
> ip rtp header-compression
> !
> interface BRI0/0
> ip address 172.200.95.3 255.255.255.240
> encapsulation ppp
> dialer map ip 172.200.95.1 name Router_CORE broadcast
> 12345678
> dialer load-threshold 20 outbound
> dialer-group 1
> isdn switch-type basic-net3
> ppp authentication chap
>
>
> Router2
>
> interface Serial0/0
> backup delay 0 10
> backup interface BRI0/0
> ip address 172.200.100.54 255.255.255.252
> no ip mroute-cache
> service-policy output llq
> ip rtp header-compression
> !
> interface BRI0/0
> ip address 172.200.95.2 255.255.255.240
> encapsulation ppp
> dialer map ip 172.200.95.1 name Router_CORE broadcast
> 12345678
> dialer load-threshold 20 outbound
> dialer-group 1
> isdn switch-type basic-net3
> ppp authentication chap
>
>
> Router_CORE
>
> interface BRI4/0
> ip address 172.200.95.1 255.255.255.240
> encapsulation ppp
> dialer map ip 172.200.95.2 name Router1 broadcast
> dialer map ip 172.200.95.3 name Router2 broadcast
> dialer-group 1
> isdn switch-type basic-net3
> ppp authentication chap
> hold-queue 75 in
>
>
> regards
> alvin chong
>
>
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