configure ports auto on

configure ports port_list {medium [copper|fiber]} auto on {[{speed speed} {duplex [half | full]}] | [{duplex [half | full]} {speed speed}]}


Enables autonegotiation for the particular port type.

Syntax Description

port_list Specifies one or more ports or slots and ports.
medium Specifies the medium as either copper or fiber. Note: This parameter applies to combo ports.
speed Specifies the port speed as either 10, 100, 1,000 (1 Gigabit), 2,500 (2.5 Gigabit), 5,000 (5 Gigabit), 10,000 (10 Gigabit), 25,000 (25 Gibabit), 40,000 (40 Gigabit), 50,000 (50 Gigabit), or 100,000 (100 Gigabit) Mbps ports.
duplex [half] Specifies half duplex; transmitting and receiving data one direction at a time.
duplex [full] Specifies full duplex; transmitting and receiving data at the same time.


Auto on for 1G and 10G copper ports.

Auto off for 25G, 40G, 50G, and 10,00G ports.

Usage Guidelines

The type of ports enabled for autonegotiation are 802.3u for 10/100 Mbps ports or 802.3z for gigabit Ethernet ports.

Flow control on gigabit Ethernet ports is enabled or disabled as part of autonegotiation. If autonegotiation is set to off, flow control is disabled. When autonegotiation is turned on, flow control is enabled. See the ExtremeXOS 31.7 User Guide for more detailed information on flow control on Extreme Networks devices.

When configuring combo ports you can specify the medium as copper or fiber. If the medium is not specified for combination ports then the configuration is applied to the current primary medium. The current primary medium is displayed in the Media Primary column of the show ports configuration command output.



The keyword medium is used to select the configuration medium for combination ports. If the port_list contains any non-combination ports, the command is rejected.

When upgrading a switch running ExtremeXOS 12.3 or earlier software to ExtremeXOS 12.4 or later, saved configurations from combo ports (copper or fiber) are applied only to combo ports fiber medium. When downgrading from ExtremeXOS 12.4 or later to ExtremeXOS 12.3 or earlier, saved configurations from combo ports (copper or fiber) are silently ignored. Therefore, you need to reconfigure combo ports during such an upgrade or downgrade.



For switches that do not support half-duplex (the ExtremeSwitching X450-G2, X460-G2, 5520-12MW-36W multi-rate ports), the copper switch ports must have auto negotiation disabled and full duplex enabled when connecting 10/100/1000 Mbps devices that do not auto negotiate. If the switch attempts and fails to auto negotiate with its partner, it will fail to link up. A non-negotiating connected device must also be manually configured for full duplex or packet loss and port errors will occur each time it detects a collision.


1G auto negotiation is not supported in 5420-YE and 5420-XE ports.


10G auto negotiation is supported in 5420 switches while using SFP+ passive copper cables.


For ExtremeSwitching X695 series switches, autonegotiation is not supported at 1G and 10G ports.


The following example configures the switch to autonegotiate for port 2, with copper medium at a port speed of 100 Mbps at full duplex:

# configure ports 2 medium copper auto on speed 100 duplex full


This command was first available in ExtremeXOS 10.1.

The speed and duplex parameters were added in ExtremeXOS 11.6.

The medium parameter was added in ExtremeXOS 12.4.

Platform Availability

This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, and 5520 series switches.