Preventing User Plane Switchback

Use the following configuration to prevent the switchback of the new Standby UPF to Active state again due to Sx/N4 monitor failure in the new Active.

configure 
   context context_name 
      service-redundancy-protocol 
         monitor sx disallow-switchover-on-peer-monitor-fail timeout seconds  
         end 

Use either of the following CLIs to allow switchback of the new Standby UPF to Active state.


no monitor sx disallow-switchover-on-peer-monitor-fail 

Or


monitor sx disallow-switchover-on-peer-monitor-fail timeout 0 

NOTES:

  • no : Disables prevention of switchover.

  • disallow-switchover-on-peer-monitor-fail timeout seconds : Prevents the switchback of the UPF to Active state when the working status of the UPF to SMF link is unknown.

    timeout seconds: Timeout after which the switchback is allowed even if the Sx/N4 failure status is not reset in the Standby peer. The valid values range from 0 through 2073600 (24 days).

    Note
    Assigning 0 seconds as the timeout allows unplanned switchover.

    If timeout keyword is not specified, the Active chassis waits indefinitely for the Sx/N4 failure status to be reset in the Standby peer.

  • The default configuration is to allow unplanned switchover due to Sx/N4 monitor failure in all conditions.

    Note
    Manual planned switchover is allowed irrespective of whether this CLI is configured or not.