I’ve a trunk connection between two 6509 made with a RJ45 connector in the second port of the 720 supervisor. Now, I’ve the SFP connector. I’ve plugged one in the first port and it’s working, but in the second is different. When I try to change the media-type from RJ45 to SFP a message appears: “Please unbundle first.” and I can’t change it.

What’s the problem? why is it not possible to do it?


Resolution :

The trunk port is part of an EtherChannel.  Shut the port down, remove the EtherChannel configuration from the port and then change it.

Command to change media type under interface :

media-type rj45
or
media-type sfp