03-02-2005 02:09 AM
I have configured two ISDN numbers for the ISDN backup but it keeps on dial on the first number after both B-channels of the first nubmer has established the connection. The ISDN call is initiated from a PRI to BRI and both of them are configured as PPP multilink. Could you help me on this? Debug output is attached. Thank you very much.
Call initiating router
interface Serial1/0:23
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type primary-dms100
ppp authentication chap
ppp multilink
!
interface Dialer1
ip address 194.11.69.185 255.255.255.252
encapsulation ppp
load-interval 30
dialer pool 1
dialer remote-name szxro010
dialer idle-timeout 300
dialer string 00778675525153918
dialer string 00778675525153418
dialer load-threshold 1 either
dialer-group 1
ppp authentication chap
ppp multilink
ppp multilink links minimum 4
Call receiving router
interface BRI1/6
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
no cdp enable
ppp authentication chap
ppp multilink
!
interface BRI1/7
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
no cdp enable
ppp authentication chap
ppp multilink
!
interface Dialer1
description Dialer group controlling the BRIs
ip address 194.11.69.186 255.255.255.252
encapsulation ppp
load-interval 30
dialer pool 1
dialer remote-name hkgro080
dialer-group 1
no cdp enable
ppp authentication chap
ppp multilink
03-02-2005 08:56 AM
By default, router will dialout on 1st dialer string always using top down order. It will go to the next one once the connection fails at isdn layer.
Since you have PRI line AND load threshold 1 AND ppp multilink min 4, it will try to add alteast 4 lines.
I can see from the debugs that it dialed 00778675525153418 3 times. 1st 2 times, the links added to bundle and 3rd time the connection failed because of may be user busy etc.
So by this time, you should have all the 4 channels connected to remote routers. Do you see total 4 channels conneted or not? "show users" will confirm that
03-02-2005 08:04 PM
Thanks for your reply.
No, there were only two channels connected. The receiving side (receiving ISDN calls) is using BRI, so the calling side (initiating ISDN calls) need to dial the second the number but it is not in this case.
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