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:
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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.
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Chain—The following occurs:
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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).
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When the stacking cable is reconnected to reform the chain:
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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.
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The switches in the Inactive fragment reboot and assume their new roles in the reformed chain.
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