Bandwidth upgrade

Unanswered Question
Jul 17th, 2007

We're in the process of upgrading a circuit from 256 Mb to a t-1. I've verified that the hardware is fine (though we will be upgrading hw at a later time), but have a question on the config. The only thing I would need to change on the config is serial interface, bandwidth to 1536, correct? The router is 1751, IOS 12.2(11)T10.



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froggy3132000 Tue, 07/17/2007 - 09:35

the bandwidth command will not change the speed of the interface. Please post the relevant info from your config.

christopher_hal... Tue, 07/17/2007 - 09:43

Here's our current serial interface:

interface Serial0/0

description cir: 34.HCGS.416547

bandwidth 256

no ip address

encapsulation frame-relay IETF

no fair-queue

service-module t1 timeslots 1-4

frame-relay lmi-type ansi


interface Serial0/0.100 point-to-point

description lexington to host

bandwidth 256

ip address

no cdp enable

frame-relay interface-dlci 100 IETF



mohammedmahmoud Tue, 07/17/2007 - 10:19

Hi Chris,

No, the bandwidth command is used by routing protocols, QoS and other tools, it doesn't control the physical speed of the interface, the CSU/DSU connected to this interface controls the speed, i guess your provider will do this for you.


Mohammed Mahmoud.

sundar.palaniappan Tue, 07/17/2007 - 10:35

The only change required to use the full T1 is to enable the service module t1 timeslots all command.

int s0/0

service-module t1 timeslots all



mohammedmahmoud Tue, 07/17/2007 - 10:41


You are totally correct, i've missed that this is a channelized interface, and Chris please make sure that your provider has modified the T.S configuration on the CSU/DSU to match yours.


Mohammed Mahmoud.


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