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subinterfaces question

I've successfully created 2 subinterfaces for my serial 0 interface.

Now, I'd like to understand 2 things I'm missing about subinterfaces.

A)

Why, if do:

no interface serial 0.1

no interface serial 0.2

I can still see them but in "deleted" status?

Can I get the rid of them at all?

B) Let's say I've got a subinterface 0.1 point-to-point working fine.

Now, I'd like to switch it to multipoint. keeping all the other settings such as ip address and so on.

Can I just type:

interface serial 0.1 multipoint

or do I have to delete/recreate it from scratch?

Regards

2 ACCEPTED SOLUTIONS

Accepted Solutions

Re: subinterfaces question

Hi,

regarding A) - this is normal behaviour. You can only get rid of them completely after a reboot.

regarding B) - NO, because the interface type can not be changed. You could delete the interface, but according to A) it is still there as deleted and has still the type point-to-point. The two possibilities you have is either to take another subinterface number or to reload the router after deleting the subinterface.

Hope this helps

Martin

VIP Purple

Re: subinterfaces question

Hello,

you need to reboot the router in order to be able to use the same subinterface with a different link type). That is, once you typed ´no interface serial0.1´, you cannot configure the interface as e.g. multipoint. The router will give you the following message:

SERIAL-1-COM5(config)#int s0.1 multipoint

% Warning: cannot change link type

So, reboot the router and recreate the subinterface.

HTH,

GP

3 REPLIES

Re: subinterfaces question

Hi,

regarding A) - this is normal behaviour. You can only get rid of them completely after a reboot.

regarding B) - NO, because the interface type can not be changed. You could delete the interface, but according to A) it is still there as deleted and has still the type point-to-point. The two possibilities you have is either to take another subinterface number or to reload the router after deleting the subinterface.

Hope this helps

Martin

Re: subinterfaces question

Hi,

regarding A) - this is normal behaviour. You can only get rid of them completely after a reboot.

regarding B) - NO, because the interface type can not be changed. You could delete the interface, but according to A) it is still there as deleted and has still the type point-to-point. The two possibilities you have is either to take another subinterface number or to reload the router after deleting the subinterface.

Hope this helps

Martin

VIP Purple

Re: subinterfaces question

Hello,

you need to reboot the router in order to be able to use the same subinterface with a different link type). That is, once you typed ´no interface serial0.1´, you cannot configure the interface as e.g. multipoint. The router will give you the following message:

SERIAL-1-COM5(config)#int s0.1 multipoint

% Warning: cannot change link type

So, reboot the router and recreate the subinterface.

HTH,

GP

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