01-06-2010 01:56 PM - edited 03-19-2019 12:14 AM
Hello I am getting a CDP duplex miss match error on my core switch from one of my UC Presentation servers and I would like to enable auto negotiation. The current settings of the server is 100 full but the switch is set to auto ( I would like to get a gig). From a ssh shell I can issue the command:
set network nic eth0 auto en
I get a warning that I will lose connectivity but it still comes back at auto disabled.
Am I missing a parameter?
Thank you,
John
Solved! Go to Solution.
01-07-2010 09:46 AM
here is the bug:
as long as you set both to match, you should be fine. Just turn off CDP for that port and ignore the warnings.
01-07-2010 05:54 AM
The "duplex mismatch" is a false alarm. You'll find it on certain version of CUCM, CUPS, CER. Just turn off CDP on that specific port.
Michael
01-07-2010 07:44 AM
John,
Your set network nic command looks correct. Not sure why it's not taking.
If your CUP server is set to 100/full and the switch is auto/auto then you'll get a duplex mismatch. Autonegotiation is a passive process and while passively detecting speed is easy, detecting duplex is not. So the auto side will configure to 100/half (half duplex being the default), thus your mismatch.
You'll need to either set both sides to 100/full or auto/auto. I would recommend hard coding both sides to 100/full instead of auto/auto.
-mike
01-07-2010 09:46 AM
here is the bug:
as long as you set both to match, you should be fine. Just turn off CDP for that port and ignore the warnings.
01-07-2010 09:51 AM
Thank you, I know this sounds like a basic problem but I wasn't getting the expected behavior. I have solved this problem and CDP is now happy on the core switch. Thank you all for taking the time to respond.
John
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