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Configuring Gigabit Ethernet Autonegotiation

Configuring Gigabit Ethernet Autonegotiation with Remote Fault

To configure explicit autonegotiation and remote fault, include the auto-negotiation statement and the remote-fault option at the [edit interfaces ge-fpc/pic/port gigether-options] hierarchy level.

[edit interfaces ge-fpc/pic/port gigether-options](auto-negotiation | no-auto-negotiation) remote-fault <local-interface-online | local-interface-offline>

Configuring Flow Control

To enable flow control, include the flow-control statement at the [edit interfaces ge-fpc/pic>/port gigether-options] hierarchy level. For more information, see Configuring Flow Control.

Configuring Autonegotiation Speed on MX Series Routers

MX Series routers with Combo Line Rate DPCs and Tri-Rate Copper SFPs support autonegotiation of speed. The autonegotiation specified interface speed is propagated to CoS, routing protocols, and other system components. Half-duplex mode is not supported.

MX Series routers with IQ2 PICs connected to other devices require matching auto-negotiation configurations for both the PIC and for the device in order to achieve link up.

To specify the autonegotiation speed, use the speed (auto | 1Gbps | 100Mbps | 10Mbps) statement at the [edit interfaces ge-fpc/pic/port] hierarchy level.

To set port speed negotiation to a specific rate, set the port speed to 1Gbps, 100Mbps, or 10Mbps. If the negotiated speed and the interface speed do not match, the link will not be brought up.

If you set the autonegotiation speed auto option, then the port speed is negotiated.

You can disable auto MDI/MDIX using the no-auto-mdix statement at the [edit interfaces ge-fpc/pic/port gigether-options] hierarchy level.

Use the show interfaces ge-fpc/pic/port brief command to display the auto negotiation of speed and auto MDI/MDIX states.

Displaying Autonegotiation Status

To display Gigabit Ethernet interface details, including the autonegotiation status, use the operational mode command show interfaces ge- fpc/pic/port extensive.

Table 1 and Table 2 provide information about the autonegotiation status on local and remote routers with fiber interfaces. The status of the link and LED can vary depending on the level of autonegotiation set and the transmit and receive fiber status.

Table 1: Mode and Autonegotiation Status (Local)

Transmit	Receive	Mode	LED	Link	Autonegotiation Status
ON	ON	Default	Green	UP	Complete
ON	OFF	Default	Red	DOWN
OFF	ON	Default	Red	DOWN
OFF	OFF	Default	Red	DOWN
ON	ON	Default	Red	DOWN
ON	ON	Default	Green	UP	No-autonegotiation
ON	OFF	Default	Red	DOWN
OFF	OFF	Default	Red	DOWN
ON	ON	Default	Green	UP
ON	ON	Default	Red	DOWN
ON	ON	No-autonegotiation	Green	UP	Incomplete
ON	OFF	No-autonegotiation	Red	DOWN
OFF	ON	No-autonegotiation	Green	UP
OFF	OFF	No-autonegotiation	Red	DOWN
ON	ON	No-autonegotiation	Red	DOWN
ON	ON	Explicit	Green	UP	Complete
ON	OFF	Explicit	Red	DOWN
OFF	ON	Explicit	Red	DOWN
OFF	OFF	Explicit	Red	DOWN
ON	ON	Explicit	Red	DOWN
ON	ON	Explicit	Green	UP	No-autonegotiation
ON	OFF	Explicit	Red	DOWN
OFF	ON	Explicit	Green	UP
OFF	OFF	Explicit	Red	DOWN
ON	ON	Explicit	Red	DOWN
ON	ON	Explicit+RFI-Offline	Green	UP	Complete
OFF	ON	Explicit+RFI-Offline	Red	DOWN
OFF	OFF	Explicit+RFI-Offline	Red	DOWN
ON	ON	Explicit+RFI-Offline	Red	DOWN
ON	ON	Explicit+RFI-Offline	Green	UP	No-autonegotiation
ON	OFF	Explicit+RFI-Offline	Red	DOWN
OFF	ON	Explicit+RFI-Offline	Green	UP
OFF	OFF	Explicit+RFI-Offline	Red	DOWN
ON	ON	Explicit+RFI-Offline	Red	DOWN
ON	ON	Explicit+RFI-Offline	Red	DOWN	Complete
ON	OFF	Explicit+RFI-Offline	Red	DOWN
OFF	ON	Explicit+RFI-Online	Red	DOWN
OFF	OFF	Explicit+RFI-Online	Red	DOWN
ON	ON	Explicit+RFI-Online	Red	DOWN
ON	ON	Explicit+RFI-Online	Green	UP	No-autonegotiation*
ON	OFF	Explicit+RFI-Online	Red	DOWN
OFF	ON	Explicit+RFI-Online	Green	UP
OFF	OFF	Explicit+RFI-Online	Red	DOWN
ON	ON	Explicit+RFI-Online	Green	UP
ON	ON	Explicit+RFI-Online	Red	DOWN
ON	ON	Explicit+RFI-Online	Red	DOWN	Complete
ON	OFF	Explicit+RFI-Online	Red	DOWN
OFF	ON	Explicit+RFI-Online	Red	DOWN
OFF	OFF	Explicit+RFI-Online	Red	DOWN
ON	ON	Explicit+RFI-Online	Red	DOWN
ON	ON	Explicit+RFI-Online	Green	UP	Complete

Table 2: Mode and Autonegotiation Status (Remote)

Transmit	Receive	Mode	LED	Link	Autonegotiation Status
ON	ON	Default	Green	UP	Complete
ON	ON	Default	Red	DOWN
ON	OFF	Default	Red	DOWN
OFF	ON	Default	Red	DOWN
OFF	OFF	Default	Red	DOWN
ON	ON	No-autonegotiation	Green	UP	Incomplete
ON	ON	No-autonegotiation	Red	DOWN
ON	OFF	No-autonegotiation	Red	DOWN
OFF	ON	No-autonegotiation	Green	UP
OFF	OFF	No-autonegotiation	Red	DOWN
ON	ON	Explicit	Green	UP	Complete
ON	ON	Explicit	Red	DOWN
ON	OFF	Explicit	Red	DOWN
OFF	ON	Explicit	Red	DOWN
OFF	OFF	Explicit	Red	DOWN
ON	ON	Explicit	Red	DOWN	Complete
ON	OFF	Explicit	Red	DOWN
OFF	ON	Explicit	Red	DOWN
OFF	OFF	Explicit	Red	DOWN
ON	ON	Explicit+RFI-Offline	Red	DOWN	Complete
ON	OFF	Explicit+RFI-Offline	Red	DOWN
OFF	ON	Explicit+RFI-Offline	Red	DOWN
OFF	OFF	Explicit+RFI-Offline	Red	DOWN
ON	ON	Explicit+RFI-Online	Green	UP	Complete
ON	ON	Explicit+RFI-Online	Red	DOWN
ON	OFF	Explicit+RFI-Online	Red	DOWN
OFF	ON	Explicit+RFI-Online	Red	DOWN
OFF	OFF	Explicit+RFI-Online	Red	DOWN

TechLibrary

Supported Platforms

Related Documentation

Configuring Gigabit Ethernet Autonegotiation

Configuring Gigabit Ethernet Autonegotiation with Remote Fault

Configuring Flow Control

Configuring Autonegotiation Speed on MX Series Routers

Displaying Autonegotiation Status

Related Documentation

Published: 2013-08-01

Supported Platforms

Related Documentation

Published: 2013-08-01