Dell 7000 Series Scenario 2

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, t he previous configuration that exists for that unit is

reapplied by the master unit.

Scenario 2

Consider the same example with a four-unit stack conn ected in daisy-chain fashion.

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 c riteria:

• 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 Sta ck 1 will

have no master after the split. The election process will start o n 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 cha nge in the configuration in Stack 2. Stack 1 wi ll 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 wa s removed, all switches

would remain members of the single stack with Switch 3 co ntinuing 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