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Webcast-Catalyst9k
New Member

isdn connections

Hi all

Can anyone confirm that when connecting isdn, the other ends, dialler or BRI interface has to be in the same subnet ?

3 REPLIES

Re: isdn connections

Hi there,

For your ISDN to connect you don't need the ip's to match. HOWEVER!! If you want them to talk to eachother, then they DO need to be on the same subnet.

Hope that helps,

LH

Please rate all posts

Re: isdn connections

Hello,

in addition to the other post, there is a special case where both interfaces do not need to be on the same subnet, yet still can talk to each other. This setup uses IP unnumbered addressing for the BRI (or Dialer) interfaces. Check the following link for a sample configuration:

Configuring ISDN BRI Using the ip unnumbered Command

http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a0080094a14.shtml

HTH,

GNT

New Member

Re: isdn connections

Hey ,

All connenxns come up @ Layer 1 and layer 2 . It may be possible to have layer3 not up and rest working ..see the output no active calls made but isdn up

===========================

>>> sh isdn status<<<<

Global ISDN Switchtype = basic-net3

ISDN BRI0 interface

dsl 0, interface ISDN Switchtype = basic-net3

Layer 1 Status:

ACTIVE<<<<<<<

Layer 2 Status:

TEI = 97, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED<<<<

Layer 3 Status:

0 Active Layer 3 Call(s)<<<

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x80000003

Total Allocated ISDN CCBs = 0

Kindly rate if helps --

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