07-07-2008 08:16 PM - edited 03-06-2019 12:03 AM
Is there any way to block the duplex mismatch errors from CDP from being logged? I have a cisco switch which connects to a non-cisco switch which then connects to a number of devices including a Cisco ATA that does not support full duplex. On the cisco switch the port is autonegotiating to 100/Full, and so is the non-cisco.
When the ATA sends out its CDP packets it tells the cisco switch that it is using 10/half. The cisco switch enterprets that as being an error and logs it as:
%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/6 (not half duplex), with SEP... Port 1 (half duplex).
It would be handy if I could prevent these from getting logged (or at least rate limit them)
Thanks in advance,
Peter
Solved! Go to Solution.
07-07-2008 11:22 PM
Hi,
Disabling CDP will solve this issue. If you need CDP, but not this messages, try "no cdp advertise-v2".
07-07-2008 11:22 PM
Hi,
Disabling CDP will solve this issue. If you need CDP, but not this messages, try "no cdp advertise-v2".
07-08-2008 03:01 PM
Thanks,
That looks like it should solve the problem. All I lose is the native VLAN detection and VTP management domain - a small price to pay to get rid of the annoying messages in my logs.
Regards,
Peter
03-15-2010 04:39 AM
This breaks Cisco Voice. Any other workarounds?
07-11-2019 08:26 AM
You can disable it at the port level usually, for example:
interface fa0/1
description <device name>
switchport access vlan 30
switchport mode access
no cdp enable
end
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