Today I was doing a port-channel turn up and the command Speed nonegotiate populated its self into the port-channel we thought maybe it was causing some DTP issues. It was not but there is another command with the nonegotiate syntax that does disable DTP.
Switchport nonegotiate:
When using the nonegotiate keyword, Dynamic Inter-Switch Link Protocol and Dynamic Trunking Protocol (DISL/DTP)-negotiation packets are not sent on the interface. The device trunks or does not trunk according to the mode parameter given: access or trunk. This command returns an error if you attempt to execute it in dynamic (auto or desirable) mode.
Speed nonegotiate:
The nonegotiate keyword is available only for SFP module ports. SFP module ports operate only at 1000 Mbps but can be configured to not negotiate if connected to a device that does not support autonegotiation.
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