Cisco 2960 (WS-C2960-8TC-L) with SFP (GLC-FE-100FX) duplex issues

Answered Question
Feb 8th, 2010

Hi There,

We have 2 Cisco 2960's (WS-C2960-8TC-L) trunked together via interface Gi0/1 on each switch using SFP's (GLC-FE-100FX). Switch Version 12.2(50)SE3

Although the link is up and operational it is only running at half-duplex (a-half a-100) and we are unable to force speed or duplex changes on interface Gi0/1.

Gi0/1 .1Q TRK to SW2  connected 1 a-half  a-100  100BaseFX-FE SFP

Should this configuration set-up run at a-full a-100 or do we need a different IOS image.

Thanks in advance

Jim.

Correct Answer by Jon Marshall about 7 years 1 week ago

argyll-bute wrote:

Hi There,

We have 2 Cisco 2960's (WS-C2960-8TC-L) trunked together via interface Gi0/1 on each switch using SFP's (GLC-FE-100FX). Switch Version 12.2(50)SE3

Although the link is up and operational it is only running at half-duplex (a-half a-100) and we are unable to force speed or duplex changes on interface Gi0/1.

Gi0/1 .1Q TRK to SW2  connected 1 a-half  a-100  100BaseFX-FE SFP

Should this configuration set-up run at a-full a-100 or do we need a different IOS image.

Thanks in advance

Jim.

Jim

Under the gigabit interfaces add this -

int gi0/1

media-type sfp

then you should be able to configure duplex/speed settings.

Jon

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Correct Answer
Jon Marshall Mon, 02/08/2010 - 09:20

argyll-bute wrote:

Hi There,

We have 2 Cisco 2960's (WS-C2960-8TC-L) trunked together via interface Gi0/1 on each switch using SFP's (GLC-FE-100FX). Switch Version 12.2(50)SE3

Although the link is up and operational it is only running at half-duplex (a-half a-100) and we are unable to force speed or duplex changes on interface Gi0/1.

Gi0/1 .1Q TRK to SW2  connected 1 a-half  a-100  100BaseFX-FE SFP

Should this configuration set-up run at a-full a-100 or do we need a different IOS image.

Thanks in advance

Jim.

Jim

Under the gigabit interfaces add this -

int gi0/1

media-type sfp

then you should be able to configure duplex/speed settings.

Jon

Jim Bell Tue, 02/09/2010 - 02:05

Jon,

That has worked now allows me to alter the duplex setting (speed cannot be altered due to to fixed rate of SFP).

Thanks for your help

Jim.

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