Duplex Mismatch error on the ports connected to UCM Server

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Jun 24th, 2009
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We have fixed the UCM server NIC Speed to 100 and Duplex to full and configured the connecting Cisco switch port Speed to 100 and Duplex to full..But still, the Cisco switch is reporting Duplex mismacth..

UCM Server details:

MCS7835H2-K9-CMC1 - HW/SW MCS 7835-H2 Unified CM 7.0 Appliance

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Overall Rating: 5 (2 ratings)
parshah Wed, 06/24/2009 - 09:33
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Can you set the port speed and duplex to auto on UCM and switch port? If after that you still get the same error, it could be a switch port issue or a bad NIC on the server.


rravish Wed, 06/24/2009 - 10:12
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We tried that and it did not work..Initially both the switch port and the UCM NIC were in AUTO mode. After encountering duplex mismatch issue, we fixed the port speed and duplex at both end.


exonetinf1nity Thu, 06/25/2009 - 07:40
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I know it's a silly question but have you rebooted the server following the change to the onboard NIC?


rravish Fri, 06/26/2009 - 02:29
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Many thanks..It is indeed a bug.. We managed to resolve this issue by disabling the CDP on the switch ports..


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