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New Member

don't permit entry duplex full command in a gigabitethernet interface

I have in the network switches 2960 and 3560, but don't can type in CLI the duplex full, speed command.

the IOS in the switches is 12.2(35)SE5

thanks.

SW_NEIV_01(config)#inter gigabitEthernet 0/2

SW_NEIV_01(config-if)#

SW_NEIV_01(config-if)#

SW_NEIV_01(config-if)#du

SW_NEIV_01(config-if)#duplex?

% Unrecognized command

SW_NEIV_01(config-if)#duplex full

^

% Invalid input detected at '^' marker.

SW_NEIV_01(config-if)#speed

^

% Invalid input detected at '^' marker.

SW_NEIV_01(config-if)#

2 ACCEPTED SOLUTIONS

Accepted Solutions
Gold

Re: don't permit entry duplex full command in a gigabitethernet

There is only full duplex with gigabit.

There is no such thing as gig/half-duplex. No matter if it is copper ports or fiber ports.

HTH

Re: don't permit entry duplex full command in a gigabitethernet

Maybe it's the IOS. I was able to change duplex and speed on another switch which had a gigabit copper sfp.

Mohamad

20 REPLIES
New Member

Re: don't permit entry duplex full command in a gigabitethernet

I had the same issue on my 3750 and found out that a port in routed state can be configured for speed and duplex and a switchport cannot be. Let me know if you find more information.

OJ

New Member

Re: don't permit entry duplex full command in a gigabitethernet

this teh configuration in the interfaces:

SW_NEIV_01#sh run inter gigabitEthernet 0/1

Building configuration...

Current configuration : 59 bytes

!

interface GigabitEthernet0/1

switchport mode trunk

end

if you need more information, please tell me

Re: don't permit entry duplex full command in a gigabitethernet

Can you please post results from : "sh run int gi0/2"

Thanks,

Mohamad

New Member

Re: don't permit entry duplex full command in a gigabitethernet

only had configured this:

SW_NEIV_01#sh run inter gigabitEthernet 0/2

Building configuration...

Current configuration : 59 bytes

!

interface GigabitEthernet0/2

switchport mode trunk

end

Re: don't permit entry duplex full command in a gigabitethernet

What's you media-type? Are you using fiber SFP? If so, you can't specify duplex because it's full duplex by nature.

New Member

Re: don't permit entry duplex full command in a gigabitethernet

Here's the output from my switch.

Full-duplex, 100Mb/s, link type is auto, media type is 10/100/1000BaseTX SFP.

I think you can still change the speed/duplex if the port is routed and not switchport.

New Member

Re: don't permit entry duplex full command in a gigabitethernet

I don understand what is a port routed or how is the configuration for put a switch port routed?

New Member

Re: don't permit entry duplex full command in a gigabitethernet

no, don't is fiber is utp pair twister

Re: don't permit entry duplex full command in a gigabitethernet

Change it to a non trunk port and then change the speed and duplex.

New Member

Re: don't permit entry duplex full command in a gigabitethernet

i tried change this but still don't works

SW_NEIV_01#sh run inter giga 0/2

Building configuration...

Current configuration : 59 bytes

!

interface GigabitEthernet0/2

switchport mode trunk

end

SW_NEIV_01#conf ter

Enter configuration commands, one per line. End with CNTL/Z.

SW_NEIV_01(config)#inter giga0/2

SW_NEIV_01(config-if)#no switchport mode trunk

SW_NEIV_01(config-if)#

SW_NEIV_01(config-if)#duplex

^

% Invalid input detected at '^' marker.

SW_NEIV_01(config-if)#

Hall of Fame Super Gold

Re: don't permit entry duplex full command in a gigabitethernet

mqayoolsuhsc is right. Your media type shows that Gig 0/2 is using a GLC-TX. This SFP will NOT negotiate speed/duplex setting. GLC-TX SFP negotiates to speed 1000 and FULL Duplex, period.

Hope this helps.

Gold

Re: don't permit entry duplex full command in a gigabitethernet

There is only full duplex with gigabit.

There is no such thing as gig/half-duplex. No matter if it is copper ports or fiber ports.

HTH

New Member

Re: don't permit entry duplex full command in a gigabitethernet

i belive that the matter is for the IOS: 12.2(35)SE5

Re: don't permit entry duplex full command in a gigabitethernet

Maybe it's the IOS. I was able to change duplex and speed on another switch which had a gigabit copper sfp.

Mohamad

New Member

Re: don't permit entry duplex full command in a gigabitethernet

now our find the solution; the ports sfp are empty, we must connect gbic adapter, therefore, don't permit change trasmition mode (duplex or speed),we have connect utp ports so dont can entry the duplex and speed command.

Re: don't permit entry duplex full command in a gigabitethernet

harold.morales, did you really mean that my suggestions/comments were not helpful?

Hall of Fame Super Blue

Re: don't permit entry duplex full command in a gigabitethernet

Mohamad

I suspect there may be a mistake as the question was marked as resolving the issue. I have rated to try and compensate.

Jon

Re: don't permit entry duplex full command in a gigabitethernet

Oh, I see. A rating of 1 means that the comment was "not helpful."

New Member

Check by changing the media

Check by changing the media type. then try changing the speed / duplex

interface Gigabit0/0
 media-type rj45

New Member

This worked for me, we have

This worked for me, we have glc-fe-100lx-rgd SFP, accepted the command "duplex full", after specifying the media.

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