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Stacking Dell PowerConnect 7000 Series Switches
Page 19
If PoE is enabled on a switch port shortly before a master failover and the hardware status change had
not yet been communicated to the backup unit, the switch will continue to provide PoE power even
though PoE is not enabled for the port in the configuration on the new master. The user can correct
this configuration mismatch by re-enabling PoE on the port.
Stack Member Failover
When a unit in the stack fails, the master unit removes the failed unit from the stack. No changes or
configuration settings are applied to the other stack members; however, dynamic protocols will try to
re-converge as the topology could change because of the failed unit. When there are no connected
ports on the failed unit, the stack will be intact without any changes.
Failover Scenarios
This section describes examples of what happens when a stack member or the master unit fails.
Scenario 1
In this example, the stack has four members that are connected through a daisy-chain.
When all four units are up and running, the show switch CLI command gives the following output:
console#show switch
Managemen Standby Preconfig Plugged-in Switch Code
Switch Status Status Model ID Model ID Status Version
------ ---------- ------------- --------- -------- ------------ --------
1 Stack Mbr Standby PCT7048 PCT7048 OK 4.0.0.6
2 Stack Mbr PCT7048 PCT7048 OK 4.0.0.6
3 Mgmt Sw PCT7048 PCT7048 OK 4.0.0.6
4 Stack Mbr PCT7048 PCT7048 OK 4.0.0.6
At this point, if Unit 2 is powered off or rebooted due to an unexpected failure, show switch gives
the following output:
Switch 1
Switch 2 Standby
Switch 3
Switch 4
Master