Dell PowerConnect PC7048P Livre blanc technique - Page 18
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Stacking Dell PowerConnect 7000 Series Switches
Adding a Stack Member with Minimal Interruption
When adding a new member to a stack, make sure that only the stack cables and no host-facing
network cables are connected before powering up the new unit. Make sure the end-user links are not
connected to any ports on the unit being added and the new member is powered off. This is important
because if STP is enabled and any links are UP, then Spanning Tree Protocol (STP) re-convergence will
take place as soon as the link is detected.
After the stack cables on the new member are connected to the stack, connect the switch power. Do
not connect another switch to the stack until the existing members are powered up. Also, do not
connect two functional, powered-up stacks together. If two functional, powered-up stacks are
connected together or connect a powered-up new member to the stack, then master re-election takes
place, which causes the stack that no longer has a master to reboot. See "Merging Two Operational
Stacks" for more details.
An "unassigned unit" is a switch that is preconfigured to be a member of a stack, but has not been
physically connected to the stack. If there are any unassigned units already configured on the stack,
remove them prior to adding a new unit to stack. This is important because when there is any
preconfigured unit and the master holds some configuration for that unit, as soon as the new unit is
detected, the configuration is applied, which might trigger the re-convergence or startup of many
other protocols. However, it is possible to intentionally pre-configure a unit. The
preconfigured/unassigned units can be viewed by using the show switch CLI command shown below.
The following example shows how to view the units in the stack and remove an unassigned unit:
console#show switch
Management Standby
SW
Status
Status
--- ---------- --------- ------------- ------------- ------------- ----------
1
Mgmt Sw
2
Unassigned
console#configure
console(config)#stack
console(config-stack)#no member 2
console(config-stack)#exit
console(config)#exit
Preconfig
Plugged-in
Model ID
Model ID
PCT7048P
PCT7028P
PCT7028P
Switch
Code
Status
Version
OK
4.0.0.6
Not Present
0.0.0.0
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