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Explorer

Command to show if ports are full/half duplex?

Hello,

Is there a summary command to show whether the ports on a switch are in half or full duplex and in 10/100/1000?

Thanks

6 REPLIES 6
Highlighted
Advisor

Hi,

sh interface status

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
Highlighted
Rising star

Hi

And you can also use the mode button on the switch.

That will most of the time tell you the information also.

Good luck

HTH

Highlighted
Participant

Hi Andy,

use

Network-Test#sh int status | inc Fa0/1

Port        Name               Status       Vlan       Duplex    Speed    Type

Fa0/1                        notconnect     108          auto         auto    10/100BaseTX

and also you can use sh interface f0/1

thanks

Highlighted
Beginner

Hi Andy

            # show interface status

or          # show int fa0/1

Thanks

Highlighted

show controller if available. if not check show log

sw4#show contr g0/3 | i ull
Device status = full-duplex, link up

showing output from only relevant section

sw4#show controllers g0/3

..

Register decodes:
Status : 0x80080783, FD, UP, 1000Mbps, Auto1000Mbps, PCI
Control register : 0x00000040, HD, SetLinkUP, 10Mbs
Control register ext: 0x00000000, Copper

Rxdescriptor addr=09594E00 len=00000000, stat=00000000
Txdescriptor addr=06CC5B87 cmd/len=0B00003C, stat=00000001
RX is enabled, TX is enabled
Device status = full-duplex, link up
PCI width = 32, PCI66=0, PCIX=0, PCIXSPD is 50-66MHz Device Speed = 1000Mbps

...

show interface status just says auto which is uselsss...

Highlighted

Hi all,

Nice answers. Another way to find out whether the ports on a switch are in half or full duplex is using CDP with the command show cdp neighbors detail

Please find below the output. It shows the neighbor duplex operation.

  • Duplex: full  //Neighbor connected to that port is operating in full duplex.
  • Duplex: half  //Neighbor connected to that port is operating in half duplex.
  • Duplex: half (Mismatch) //Neighbor connected to that port is in half duplex but the local port is in full duplex.
  • Duplex: full (Mismatch) //Neighbor connected to that port is in full duplex but the local port is in half duplex.

SW-L3-02#show cdp nei det
-------------------------
<output omitted>
Native VLAN: 1
Duplex: full  //shows the neighbor duplex operation.
Management address(es):
IP address: 192.168.1.10

Hope it helps.

Kind regards,

Carlos Acosta

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