CCIE Pursuit Blog

October 17, 2007

show interfaces transceiver properties

Occasionally I’ll stumble across a command that I’ve never seen before.  I recently had that experience with “show interfaces transceiver properties”.  The command is buried in the command guide under the voluminous “show interfaces” command:

(Optional) Display the physical properties of a CWDM1 or DWDM2 small form-factor (SFP) module interface. The keywords have these meanings:

•detail—(Optional) Display calibration properties, including high and low numbers and any alarm information.
•properties—(Optional) Display speed, duplex, and inline power settings on an interface.

While it’s supposed to be specific to SFP interfaces, it will work just fine with normal FastEthernet interfaces as well (I’m using a 3560 for this example):

sw1#show interfaces transceiver properties
Name : Fa0/1
Administrative Speed: auto
Administrative Duplex: auto
Administrative Auto-MDIX: on
Administrative Power Inline: N/A
Operational Speed: auto
Operational Duplex: auto
Operational Auto-MDIX: on

Name : Fa0/2
Administrative Speed: auto
Administrative Duplex: auto
Administrative Auto-MDIX: on
Administrative Power Inline: N/A
Operational Speed: auto
Operational Duplex: auto
Operational Auto-MDIX: on
—output truncated—

You can see that if we change some default settings on an interface, this command will show them:

interface FastEthernet0/3
 speed 10
 duplex half
 no mdix auto

sw1#show interfaces transceiver properties | b Fa0/3
Name : Fa0/3
Administrative Speed: 10
Administrative Duplex: half
Administrative Auto-MDIX: off
Administrative Power Inline: N/A
Operational Speed: 10
Operational Duplex: half
Operational Auto-MDIX: off

There is nothing really exciting in the output that I can’t get with “show interface fa0/3 status”, except for the MDIX information.  In a previous post, I wrote:

Note:The only command that I know of that will show the auto-MDIX state of an interface (other than looking at the running-configuration of the interface) is the rather verbose “show controllers ethernet-controller fax/x phy | include MDIX” command.

“show interfaces transceiver properties” accomplishes this as well and is slightly easier to type.  :-)

IPexpert: Free Voice CCIE Training This Friday

IPexpert is presenting two free Voice CCIE  vLectures in the next few days.  On Friday there will be a lecture on Unity and next Wednesday’s lecture will be on Dial Plans: 

Oct 19 5:00 PM EST  Online 
Instructor: Vik Malhi
Topic: Unity
Track: Voice

Oct 24 8:00 PM EST  Online 
Instructor: Mark Snow
Topic: Dial Plan
Track: Voice

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