E1 ISDN - Group Channel Shutdown for overflow testing

[ccg-collab1]

Hi All,

Is it possible to shutdown the group-channel of E1 via CLI? ex. interface serial 0/0/0:15.1 and so on..

We are planning to test the overflow of the E1.

Our goal is, if the 30 channels are already used - it will fail over to the other E1. however we may need to simultaneously call the E1 line and filled the 30 channels for us to know if it will fail over. So is it possible that we shutdown certain channels lets say 25 channels and only 5 channels will retain and only 5 simultaneous calls will be allowed?

Hoping for your response.

Thank you 

[Terry Cheema]

Yes - Try the below:

int S01/0/0:15

isdn service b_channel 0-10 state 2

Here is the explanation from IOS itself:

R01(config)#int serial 0/2/0:15

R01(config-if)#isdn service b_channel ?
  <0-31>  B channel range or 0 for complete interface

R01(config-if)#isdn service b_channel 0-10 ?
  state  Specify the desired state.

R01(config-if)#isdn service b_channel 0-10 st
R01(config-if)#isdn service b_channel 0-10 state ?
  <0-2>  Valid states are 0=Inservice 1=Maint 2=Outofservice

-Terry

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[ccg-collab1]

Hi Terry,

Thank you for your response. May I know what would happen if the port state is setup as in service, Maintenance and Out of service?

and is this procedure is not valid to shut the channels?

ex. config#interface serial 0/0/0:15.1 - 0/0/0:15.30

config-sub#shutdown

[Terry Cheema]

You will not be able to access individual b-channel and if you shut down the d-channel, the whole line goes down.

I guess maintenance will not bring down any active call or something similar, out of service the channel will be taken out of service straight away.

-Terry

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[ccg-collab1]

Hi Terry,

So to meet my goal to retain only 5 channels and allowed only 5 simultaneous calls, this command should do it?

config#int serial 0/0/0:15

config-if#isdn service b_channel 0-25 state 2 (why starting from 0 not 1?)

Thank you 

[Terry Cheema]

Yes looks right.

Run - show ip int brief and you will find out the first channel is starting at 0: something like this Serial0/0/1:0.

Based on the command out of show ip interface brief - you can see how many channels you have got and work out things accordingly.

-tc

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