Restoring operation after disconnecting a stacking cable
If a stacking cable becomes disconnected from one of the switches in the stack, the effect depends on the stacking topology that is being used:
Mesh—The stack topology is temporarily changed to a ring. To recover, simply reconnect the stacking cable; the mesh topology and the previous stack configuration is restored.
Ring—There is little effect. The stack topology is temporarily changed to a chain topology. To recover, simply reconnect the stacking cable; the ring topology and the previous stack configuration is restored.
- Chain—The following occurs:
The smaller section (fragment) of the stack that results from the disconnection becomes
Inactive
(theStack Status
value shown in the output of the show stacking command isInactive
.If the two resulting fragments are the same size, the fragment that contains the Commander will be
Active
, and the other fragment becomesInactive
.Both fragments will have a Commander and a Standby selected (if there is more than one switch in each fragment).
- When the stacking cable is reconnected to reform the chain:
The Commander and Standby of the Active fragment retain those roles for the resulting stack. If the original Commander was not in that fragment, then the stack will have a new Commander when the stack is reformed.
The switches in the Inactive fragment reboot and assume their new roles in the reformed chain.