Configuration of Serial interface

Unanswered Question
Aug 31st, 2007


I have a small query regarding the configuration of serial interface below as:

what is the difference between

serial 0/0


serial 0/0/0

kindly explain I am in dire need

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
mohammedmahmoud Fri, 08/31/2007 - 02:04


Using either serial 0, serial 0/0 or serial 0/0/0 depends on the router platform and how it numbers its interface for example a WIC1T serial on a 1721 is serial0, a WIC-2T is serial 0/0, while on a 2800 it is serial 0/0/0.

To ease it on your self, before configuring do a "show ip interface brief" and you'll know how your router numbers its interfaces.


Mohammed Mahmoud.

Calin Chiorean Fri, 08/31/2007 - 02:07

Naming notation for T3/E3 interfaces is rack/slot/module/port;

Naming notation for T1/E1/DS0 interfaces is rack/slot/module/port/t1-num:channel-group-number.

?rack: Chassis number of the rack.

?slot: Physical slot number of the modular services card or line card.

?module: Module number. A physical layer interface module (PLIM) is always 0. Shared port adapters (SPAs) are referenced by their subslot number.

?port: Physical port number of the T3 controller.

?t1-num: T1 or E1 channel number. T1 channels range from 0 to 23; E1 channels range from 0 to 30.

?channel-group-number: Time slot number. T1 time slots range from 1 to 24; E1 time slots range from 1 to 31. The channel-group-number is preceded by a colon and not a slash.

So, in your case I believe you have in the first case module/port (s0/0), and in the second case slot/module/port (s0/0/0)

I hope this is ok for you.


This Discussion