Changing the Gbps fiber negotiation mode

The globally configured Gbps negotiation mode is the default mode for all Gbps fiber ports. You can override the globally configured default and set individual ports to the following:

• neg-full-auto—The port first tries to perform a handshake with the other port to exchange capability information. If the other port does not respond to the handshake attempt, the port uses the manually configured configuration information (or the defaults if an administrator has not set the information). This is the default.
  Note: The neg-full-auto mode is not supported on RUCKUS ICX 7K devices.
• auto-gig—The port tries to perform a handshake with the other port to exchange capability information.
• neg-off—The port does not try to perform a handshake. Instead, the port uses configuration information manually configured by an administrator.

To change the mode for individual ports, enter commands such as the following.

device(config)# interface ethernet 1/1/1 to 1/1/4
device(config-mif-1/1/1-1/1/4)# gig-default auto-gig

This command overrides the global setting and sets the negotiation mode to auto-Gbps for ports 1 - 4.

For Fiber ports, the configuration is considered invalid if the Gbps negotiation mode is enabled on one end of the link and Gbps negotiation mode is turned off at the other end.

The following tables provide a list of invalid configurations on fiber ports.