The errdisable status indicates that the port was automatically disabled by the switch operating system software because of an error condition encountered on the port. Check the EtherChannel configuration on both switches. If one side is configured for EtherChannel in the On mode, the peer ports must also be in On mode or they will go to errdisable. Reference: https://community.cisco.com/t5/networking-documents/port-status-is-errdisable-due- to-etherchannel-misconfiguration/ta-p/3131226fic.