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Cannot Establish Gigabit Link Between Catalyst Switches and GSR Router

admin_2
Level 3
Level 3

‎06-24-2002 02:28 PM - edited ‎03-01-2019 10:24 PM

The GSR Gigabit interface is configured for no negotiation auto and the line protocol goes up when connected to the Catalyst switch.

The Catalyst switch port remains unconnected even when it is physically attached to the GSR router.

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Not applicable

‎06-24-2002 02:28 PM

The flow control settings must match on both sides for the link to come up. It is highly recommended that you configure auto-negotiation to on for both devices. (Auto-negotiation is enabled by default on all Catalyst switches.) Otherwise, if you have a layer 1 problem, the link remains up and a unidirectional link will result.

The initial software releases that support Gigabit Ethernet on the GSR router do not support gigabit auto-negotiation.

The following command configures gigabit auto-negotiation on the Catalyst 6000/6500:

set port negotiation module/port disable|enable

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