Removing A Switch From The Stack - Dell PowerConnect 8024 User Configuration Manual

After the stack cables on the new member are connected to the stack, you can
connect the power. Do not connect a new member to the stack after it is
powered up. Also, do not connect two functional, powered-up stacks together.
Hot insertion of units into the stack is not supported.
If a new switch is added to a stack of switches that are powered and running
and already have an elected stack master, the newly added switch becomes a
stack member rather than the stack master. In this situation, the firmware of
the new unit may be overwritten based on the configuration of the stack
master. The running configuration of the newly added unit is overwritten
with the stack master configuration. Stack port configuration is always stored
on the local unit and may be updated with preconfiguration information from
the stack master when the unit joins the stack.
You can preconfigure information about a stack member and its ports before
you add it to the stack. The preconfiguration takes place on the stack master.
If there is saved configuration information on the stack master for the newly
added unit, the stack master applies the configuration to the new unit;
otherwise, the stack master applies the default configuration to the new unit.

Removing a Switch from the Stack

The main point to remember when you remove a unit from the stack is to
disconnect all the links on the stack member to be removed. Also, be sure to
take the following actions:
• Remove all the STP participating ports and wait to stabilize the STP.
• Remove all the member ports of any Port-Channels (LAGs) so there will
not be any control traffic destined to those ports connected to this member.
• Statically re-route any traffic going through this unit.
When a unit in the stack fails, the stack master removes the failed unit from
the stack. No changes or configuration are applied to the other stack
members; however, the dynamic protocols will try to reconverge 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.
If you remove a unit and plan to renumber the stack, issue a no member
command in Stack Configuration mode to delete the removed switch from
the configured stack member information.
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Managing a Switch Stack
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