Configuration Guide for Cisco NCS 1014, IOS XR Releases 25.x.x

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Configuration Guide for Cisco NCS 1014, IOS XR Releases 25.x.x

Headless mode

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This section explains how headless mode enables uninterrupted traffic flow on the NCS 1014 during control plane disruptions.


A headless mode is a system operation mode that

  • enables Cisco NCS 1014 to continue forwarding traffic when the controller card is absent, failed, or being restarted

  • allows fault propagation for client and trunk ports, and

  • maintains errorless operation unless there is any line-level activity or the traffic is encrypted and the keys have expired beyond a predefined maximum duration.

During headless mode, the control plane will be unavailable. You cannot provision new configurations, view operational data, or perform performance monitoring without a functional controller.