ISDN PRI connection issue

Unanswered Question

Hi all,

I have hub and spoke environment that is connected via point to point link. For back we have ISDN PRI line at Hub side and ISDN BRI line at spoke side. When ever a site lose P2P connection it automatically connect via ISDN. Now the issue is that when there is two or more spoke site are having issue with P2P link and they connect through ISDN the is connecting but the data is not passing through the line

means lot of data lose and ping lose is there

HUB is Cisco 2800

Spokes are Dlink routers

any suggestion please

I have this problem too.
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ohassairi Tue, 12/16/2008 - 01:30

your config file is incomplete?

have you configured a dialer-list?

Giuseppe Larosa Tue, 12/16/2008 - 04:42

Hello Bhargav,


interface Serial1/0:15

no dialer rotary-group 1

dialer pool-member 1

Hope to help


Giuseppe Larosa Wed, 12/17/2008 - 11:46

Hello Bharghav,

the rotary-group is an older method the first one I used years ago

the dialer pool is the one used now provides more flexibility allowing different dialer profiles to share a pool of B channels.

And your configuration under dialer 0 interface is the one that works well with dialer pool commands.


to test with dialer pool you need also to add

int dialer1

dialer pool 1

(this is needed also to use rotary groups)

Note in case of rotary groups config the following applies:

It is important that the dialer interface designator (in this case, 2) match the dialer rotary group

number. If these two numbers do not match, the configuration does not function properly.

Hope to help


ohassairi Tue, 12/16/2008 - 20:12

what about routing? how are you routing your packets? there is no "ip route" commands!!


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