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

[harold.morales]

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)#

[bansal.ojasvi]

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

[harold.morales]

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

[Mohamad Qayoom]

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

Thanks,

Mohamad

[harold.morales]

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

[Mohamad Qayoom]

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

[bansal.ojasvi]

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.

[harold.morales]

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

[harold.morales]

no, don't is fiber is utp pair twister

[Mohamad Qayoom]

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

[harold.morales]

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)#

[Leo Laohoo]

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.

[hobbe · Accepted solution]

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

[harold.morales]

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

[Mohamad Qayoom · Accepted solution]

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

Mohamad