Router Hardware Management Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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Router Hardware Management Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

Configure the breakout on a port

Updated: September 11, 2026

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This topic describes how to configure the breakout mode on an optics controller of a port so that the router splits the port into four independent and logical 10 Gigabit Ethernet subports.

Configure the breakout mode on the optics controller of a port to split the port into four 10 Gigabit Ethernet subports.

Procedure

  1. Enter global configuration mode.

    Example:

    Router# configure
Fri Oct 11 23:58:47.165 UTC

  2. Enter optics controller configuration mode for the target port.

    Example:

    Router(config)# controller optics 0/1/0/28

  3. Configure the 4x10 breakout on the optics controller.

    Example:

    Router(config-Optics)# breakout 4x10

  4. Commit the configuration and exit the configuration mode.

    Example:

    Router(config-Optics)# commit
Fri Oct 11 23:59:51.261 UTC
RP/0/RP0/CPU0:uut(config-Optics)# end
RP/0/RP0/CPU0:uut#

  5. Verify the breakout configuration on the optics controller and view the four 10 Gigabit Ethernet subinterfaces created by the breakout.

    Example:

    Router# show running-config controller optics 0/1/0/28
Sat Oct 12 00:11:33.962 UTC
controller Optics0/1/0/28
breakout 4x10
!

Router# show int br location 0/1/CPU0 | i Te
Sat Oct 12 00:11:38.609 UTC
       Te0/1/0/27/0          up          up               ARPA 10000   10000000
       Te0/1/0/27/1          up          up               ARPA 10000   10000000
       Te0/1/0/27/2          up          up               ARPA 10000   10000000
       Te0/1/0/27/3          up          up               ARPA 10000   10000000
       Te0/1/0/28/0          up          up               ARPA 10000   10000000
       Te0/1/0/28/1          up          up               ARPA 10000   10000000
       Te0/1/0/28/2          up          up               ARPA 10000   10000000
       Te0/1/0/28/3          up          up               ARPA 10000   10000000