interface command

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Apr 9th, 2009
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What does the command "negotiation auto" do on a interface as opposed to "speed auto / duplex auto " . It seems you can have both on a interface . Can't find a reference when doing a search .

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Mohsin Barkat Thu, 04/09/2009 - 06:39
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negotiation auto


Enables/disables IEEE 802.3x autonegotiation on a Gigabit Ethernet interface.

Syntax: [no] negotiation auto

Description: Autonegotiation detects the capabilities of the device at the other end of the link and attempts to configure the highest performance mode of interoperability between the two devices.

Use the negotiation auto command to enable autonegotiation for this interface.

Use the no negotiation auto command to disable autonegotiation for this interface.

NOTE It is recommended that autonegotiation be enabled on the interface.

NOTE For the 1x10gbe interface flow control is symetric. Autonegotiation is not a function within the 10gbe specification.

Factory Default: Negotiation disabled.

Command Mode: Gigabit Ethernet interface configuration.

Example: In the following example:

The interface gbe command specifies a Gigabit Ethernet interface and changes the command mode to Interface configuration.

The negotiation auto command enables autonegotiation on the specified interface.

The show command displays the new configuration:

router#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

router(config)#interface gbe 1/34/1

router(config-if)#negotiation auto


interface gbe 1/1/1

negotiation auto

no shutdown

mpls traffic-engineering tunnels

ip address


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