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duplex mismatch cisco switches

How can I identify if any of my switches are causing duplex mismatch problems, is there a tool, cant seem to find a free one? These switches are trunked together.
Thanks.
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tolinrome
Asked:
tolinrome
1 Solution
 
SouljaCommented:
Usually looking at your cli can show you warning regarding where a duplex mismatch is coming from.

Logging console  - if connected by console.
Terminal monitor -  if telnet or ssh in

sh int status - look for half duplex
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bbaoIT ConsultantCommented:
i guess you need this document rather than a software tool. :-)

http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094781.shtml
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tolinromeAuthor Commented:
ports not connected are on auto, connected ports are "a-full". Thats a good doc but only really shows how to determine and set for auto neg etc, which is already set.
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SouljaCommented:
If the port are showing auto/full why do you think you have a duplex issue.?
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tolinromeAuthor Commented:
Didnt know they were auto full until i took the advice of the first post.
Any other troubleshooting steps?
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AkinsdNetwork AdministratorCommented:
look at the interface specified in the mismatch message
Go to both interfaces that connect (identified in the error message)
Type Duplex Full on both interfaces

The problem should go away
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