E1 PRI Back to Back Layer2 cannot be established

Answered Question
Apr 7th, 2008
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Hi,

I have a problem about connecting two routers with E1 pri back to back.


The Layer 1 is Ok

but the Layer 2 is not OK. and there is no alarm

It always receive bad frame.


What can be the error ?


this is my configuration :

==========

First router :


isdn switch-type pri-net5

controller E1 1/0

framing NO-CRC4

pri-group timeslots 1-31


interface Serial1/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable



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

The second router :


controller E1 0/1/1

framing NO-CRC4

clock source internal

pri-group timeslots 1-31 service mgcp

!


interface Serial0/1/1:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bind-l3 ccm-manager

no cdp enable



Correct Answer by paolo bevilacqua about 9 years 1 month ago

On one router, you need:

isdn protocol-emulate network.


Hope this helps, please rate post if it does!

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Correct Answer
paolo bevilacqua Mon, 04/07/2008 - 08:46
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On one router, you need:

isdn protocol-emulate network.


Hope this helps, please rate post if it does!

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