10-08-2007 02:36 AM - edited 03-05-2019 06:56 PM
Hi Experts,
Any body can see it and give right rejoin.
Can we create sub-interfaces on serials? if yes how and what is the use by creating sub-interfaces on serials.
Regards,
Naidu.
10-08-2007 05:02 AM
Yes we can, here is an example
Router(config)#int s0/0
Router(config-if)#no shut
Router(config-if)#int s0/0.1 point-to-point
Router(config-subif)#ip add x.x.x.x
Regards,
~JG
10-08-2007 05:43 AM
Hi Naidu,
These sub interfaces can be used in frame relay environment.You can create a point to point or point to multipoint sub interface to connect to your remote sites using FR.
Regards
Nambi.
10-08-2007 05:57 AM
Naidu
To add a little to the explanation from Nambi: certain encapsulations like Frame Relay do support configuration of subinterfaces. But other serial encapsulations like PPP or HDLC do not support configuration of subinterfaces.
The main use of subinterfaces in Frame Relay is to be able to separate out various PVCs that are assigned over the serial link. If you have a Frame Relay connection over a serial interface you might have 4 PVCs from the provider on that link. Without subinterfaces all PVCs would operate on the physical interface in a multipoint mode. If you configure subinterfaces then you could create 4 separate point to point subinterfaces and assign a PVC to each subinterface which would operate in point to point mode rather than multipoint mode. There are sometimes advantages to operating in point to point mode such as the operation of split horizon.
HTH
Rick
10-08-2007 09:04 PM
Hi all,
Thanks to JG, Nambi and Rick for their good explaination.
As Rick told PPP or HDLC do not support on serial subinterfaces when using Frame Relay Technology then which encapsulation will do support for FR.
Regards,
Naidu.
10-09-2007 03:41 AM
Naidu
You can not do Frame Relay over an encapsulation like PPP or HDLC. Frame Relay is a separate encapsulation.
HTH
Rick
10-09-2007 03:54 AM
Hi Rick,
Apologize to my misread.
Yes I understand your prior post thanks a lot.
Regards,
Naidu.
10-09-2007 04:39 AM
Hi,
Adding to Rick's comment that you can run PPP over Frame-relay for the purpose of Authentication since Frame-relay by default doesnt support features like (Authentication,Link Quality,Reliable transmission).
Running PPP over FR could enable these features.
Regards,
Mohamed Sobair
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