duplex mismatch

alex goshtaei · ‎01-04-2010

Hi All,

there are UC520 and IAD devices. in IAD, fa interface has "duplex full" and in UC520, fa interface has "duplex auto". when I do "show interface fa 0/0" in UC520, I see "duplex half" and I am receiving lots of collision errors.

any suggestion would be very appreciated.

Alex

ansalaza · ‎01-04-2010

Hello Alex,

Both sides of a link should have auto-negotiation on, or both sides should have it off.

http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094781.shtml#when

HTH,

burleyman · ‎01-04-2010

You have a duplex mismatch.

Here is a guide http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af0.shtml

NIC - Auto.................Switchport - Auto GOOD

NIC - 100/Full

burleyman · ‎01-04-2010

Sorry My other post was incomplete.

Here is the link http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af0.shtml

See table 1

Based on that you have a duplex mismatch.

Please rate all posts that help.

Mike