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Stacking Dell PowerConnect 7000 Series Switches
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console#show switch
Management 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 Unassigned PCT7048 Not Present 0.0.0.0
3 Mgmt Switch PCT7048 PCT7048 OK 4.0.0.6
4 Stack Mbr PCT7048 PCT7048 OK 4.0.0.6
When the failed unit resumes normal operation, the previous configuration that exists for that unit is
reapplied by the master unit.
Scenario 2
Consider the same example with a four-unit stack connected in daisy-chain fashion.
Figure 4. Stack Split
If the link between Switch 2 and Switch 3 is removed, the stack is split into two different stacks with
Switches 1 and 2 in one stack and Switches 3 and 4 in another.
The master unit for each stack is determined by the following criteria:
• Switch 3 was configured as master prior to the split, so it will continue to be the
master unit for Stack 2 (units 3 and 4).
• If Switch 2 is configured as the standby, it becomes the master for Stack 1 (units 1 and
2).
• If none of the units in Stack 1 are configured as master or standby, then Stack 1 will
have no master after the split. The election process will start on these two units, and
either Switch 1 or Switch 2 will come up as a master based on which switch has the
highest base MAC address.
In this specific example, there will not be any change in the configuration in Stack 2. Stack 1 will come
up with the previously saved configuration on the new master elected.
Note that stack splits are less likely when the switches are cabled in a ring. For example, if Switch 4
was connected to Switch 1 and the link between Switch 2 and Switch 3 was removed, all switches
would remain members of the single stack with Switch 3 continuing as the master.
Switch 1
Switch 2 Standby
Switch 3
Switch 4
Switch 1
Switch 2 Master
Switch 3
Switch 4
Stack 1
Stack 2