Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

User cannot get a Gigabit Ethernet link up between a Cisco switch and a non-Cisco device due to auto-negotiation incompatibility


If the cable between the devices is known to be good and is the correct type, yet the link does not light up, one of these commands may need to be issued on the Cisco Gigabit interface:

Be sure to disable auto-negotiation on the connected device as well.

An alternative to disabling auto-negotiation is to contact the vendor for a software or hardware upgrades for IEEE 802.3z Gigabit auto-negotiation support.

For more information, refer to the Gigabit Auto-Negotiation (No Link to Connected Device) section of Troubleshooting Cisco Catalyst Switches to NIC Compatibility Issues.

Port LED status

Not lit

Device connected to switch

Non Cisco

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 03:40 PM
Updated by:
Labels (1)