subinterface & frame relay dlci

Unanswered Question
May 23rd, 2008

how to change the type of a subinterface to point-to-point once configured as mulipoint or vice versa.

How to remove the "dlci x" from a subinterface once configured through the following configuration

"frame-rely interface-dlci x"

I have this problem too.
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Paolo Bevilacqua Fri, 05/23/2008 - 08:57

1. depending on IOS version, you can't. create a new subinterface instead

2 no frame-rely interface-dlci x

Richard Burts Fri, 05/23/2008 - 11:24

Muhammad

To supplement the answer from Paolo. I am not aware of any version of IOS where you can change the subinterface type directly. Once you have defined the subinterface type in the interface data structure and the IDB has been allocated you can not change the subinterface type. You would need to remove the subinterface, save the config, reboot the router, then you can configure the subinterface with the other type.

I agree with Paolo that the easy answer is to just configure a new subinterface.

HTH

Rick

Edison Ortiz Sat, 05/24/2008 - 07:07

how to change the type of a subinterface to point-to-point once configured as mulipoint or vice versa.

Use a different number on the multipoint interface unless is prohibited.

Rack1R1(config)#no inter s1/0.1 point-to-point

Not all config may be removed and may reappear after reactivating the sub-interface

Rack1R1(config)#inter s1/0.2 multipoint

Rack1R1(config-subif)#end

The interface number is arbitrary, in other words, it's locally significant.

HTH,

__

Edison.

Paolo Bevilacqua Sat, 05/24/2008 - 07:16

The interface number is arbitrary, in other words, it's locally significant.

Just like the DLCI number, that's why something you see them numbered the same for ease of identification.

rehan_uet Mon, 05/26/2008 - 03:04

As far as subinterface is concerned, i will create another one but the service provider has assigned me a DLCI number and I removed it from the previously configured subinterface and but when i assign the same DLCI to another subinterface it give me message 'this DLCI is already in use with another subinterface'. what should i do with it.

Giuseppe Larosa Mon, 05/26/2008 - 05:29

Hello,

as suggested by Rick you can reload the router to clean up the IDB table.

Have you removed the old subif as Edi has suggested ?

do you see the DLCI listed in the sh frame-rel pvc ?

Best Regards

Giuseppe

Amit Singh Mon, 05/26/2008 - 06:05

You can use the " no frame-relay interface-dlci X" command as suggested by Rick and then you will be able to put this config on the new interface. Otherwise you can also set the interface to default config by using command " default interface X " and then configure it from scratch. If your DLCI mapping still exists in the " show fr pvc " you might see that error. Try reloading the router as well after removing the interface-dlci.

HTH

-amit singh

rehan_uet Mon, 05/26/2008 - 09:31

thanks guys, 'default interface x' is a wonderful option, with this configuration i can assign the same dlci to the other subinterface without restarting my router.

with 'default interface x' the subinterface was removed from the configuration but could not change the type.

Giuseppe Larosa Mon, 05/26/2008 - 11:48

Hello,

it is good that you have provided a feedback.

I suppose that you have used default interface X where X is the physical serial interface (that has a default HDLC encapsulation) and this solved the problem of the DLCI without a reload.

Best Regards

Giuseppe

rehan_uet Mon, 05/26/2008 - 19:58

yes, it is true but only difference is encapsulation it was 'frame-relay' not HDLC.

thanks

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