Dell 7000 Series Stack Member Failover , Failover Scenarios

Stacking Dell PowerConnect 7000 Series Switches
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If PoE is enabled on a switch port shortly before a master fai lover and the hardware status change had
not yet been communicated to the backup unit, the swi tch will continue to provide PoE power even
though PoE is not enabled for the port in the config uration 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 st ack. No changes or
configuration settings are applied to the other stack members; however, dynamic pro tocols will try to
re-converge as the topology could change because of the fai led unit. When there are no connected
ports on the failed unit, the stack will be intact witho ut any changes.
Failover Scenarios
This section describes examples of what happens when a sta ck 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 un expected failure, show switch gives
the following output:
Switch 1
Switch 2 Standby
Switch 3
Switch 4
Master