— Exhibit —
user@router> show system switchover
Graceful switchover: On
Configuration databasE. Ready
Kernel databasE. Version incompatible
Peer statE. Steady State

— Exhibit —
You have enabled graceful Routing Engine switchover (GRES). During verification, you switched
mastership and all interfaces went down.
Referring to the output shown in the exhibit, why did the interfaces go down?

A.
The synchronization failed because the Junos OS version on the backup is incompatible with
the version running on the master.

B.
The synchronization failed because the Junos OS version on the backup does not support
GRES.

C.
The synchronization failed because the Routing Engine models are different between the
master and backup.

D.
The synchronization failed because the master Routing Engine cannot communicate with the
backup Routing Engine.