Configuring Switch Port Speed and Duplex Setting



Refer to Displaying Port Information for information on displaying port speed, duplex, autonegotiation, and flow control settings.
ExtremeXOS supports the following port types:
  • 10 Gbps ports
  • 40 Gbps ports
  • 100 Gbps ports
  • 10/100/1000 Mbps copper ports
  • 10/100/1000 SFPs
  • 10/100/1000 Mbps copper ports with Power over Ethernet (PoE)—only on the G48Tc, G48Te2, and 8900-G48T-xl with PoE daughter card modules installed in the BlackDiamond 8800 series switch, and the Summit X440-24p, X460-24p, X460-48p, X460G2-24p, and X460G2-48p switches
  • 1 Gbps small form factor pluggable (SFP) fiber ports
  • 100 FX SFPs, which must have their speed configured to 100 Mbps
  • Wide area network (WAN) PHY port—only on the Summit X480 series switches
  • 10 Gbps stacking ports (Summit family switches only)
  • 10 Gbps small Form Factor pluggable+ (SFP+) fiber ports. These should be configured to 10 Gbps auto off if an SFP+ optic is inserted; they should be configured to 1G auto on (or auto off) if 1G SFP optic is inserted.


Stacking ports always use the same type of connector and copper PHY, which are built in to the Summit family switches. You cannot configure stacking port parameters such as port speed, duplex, and link fault signal. You also cannot configure data port features such as VLANs and link aggregation. Stacking links provide the same type of switch fabric that is provided in a BlackDiamond 8800 series switch or BlackDiamond X8 series switch.

Autonegotiation determines the port speed and duplex setting for each port (except 10 and 40 Gbps ports). You can manually configure the duplex setting and the speed of 10/100/1000 Mbps ports.

The 10/100/1000 Mbps ports can connect to either 10BASE-T, 100BASE-T, or 1000BASE-T networks. By default, the ports autonegotiate port speed. You can also configure each port for a particular speed (either 10 Mbps or 100 Mbps).



With autonegotiation turned off, you cannot set the speed to 1000 Mbps.

In general, SFP gigabit Ethernet ports are statically set to 1 Gbps, and their speed cannot be modified.

However, there are two SFPs supported by Extreme that can have a configured speed:

The 10 Gbps ports always run at full duplex and 10 Gbps. The 40 Gbps ports always run at full duplex and 40 Gbps.

ExtremeXOS allows you to specify the medium as copper or fiber when configuring Summit switches with combination ports. 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.


For switches that do not support half-duplex, 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.

To configure port speed and duplex setting , use the following command:

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

To configure the system to autonegotiate, use the following command:

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



The keyword medium is used to select the configuration medium for combination ports. If 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.

ExtremeXOS does not support turning off autonegotiation on the management port.

Support for Autonegotiation on Various Ports

The following table lists the support for autonegotiation, speed, and duplex setting for the various types of ports.

Port Autonegotiation Speed Duplex
100 Gbps Off 100000 Mbps Full duplex
10 Gbps Off 10000 Mbps Full duplex
40 Gbps Off 40000 Mbps Full duplex
1 Gbps fiber SFP On (default)Off 1000 Mbps Full duplex
100 FX SFP On (default)Off 100 Mbps Full duplex
10/100/1000 Mbps On (default)Off 10 Mbps100 Mbps Full/half duplexFull/half duplex
10/100 Mbps On (default)Off 10 Mbps100 Mbps Full/half duplexFull/half duplex
10 Gbps SFP+ Off 10000 Mbps Full duplex


The following products do not support half-duplex operation: Summit X450-G2, X460-G2, BDXA-10G48T, and BDXA-G48T.

Flow control on Gigabit Ethernet ports is enabled or disabled as part of autonegotiation (see IEEE 802.3x). If autonegotiation is set to Off on the ports, flow control is disabled. When autonegotiation is On, flow control is enabled.

With Extreme Networks devices, the 1 Gbps ports and the 10 Gbps ports implement flow control as follows:

  • 1 Gbps ports
    • Autonegotiation enabled
      • Advertise support for pause frames
      • Respond to pause frames
    • Autonegotiation disabled
      • Do not advertise support for pause frames
      • Do not respond to pause frames
  • 10 Gbps ports for the Summit X460, X460G2, X480, X670, X670G2, and X770 series switches, SummitStack, and on modules for the BlackDiamond X8 series switches and the BlackDiamond 8800 series switch:
    • Autonegotiation always disabled
    • Do not advertise support for pause frames
    • Respond to pause frames