IBM RackSwitch G8000, Application Manual

Page: 163 / 362

© Copyright IBM Corp. 2011 Chapter 13. Stacking
161
Replacing or Removing Stacked Switches
Stack switches may be replaced or removed while the stack is in operation.
However, the following conditions must be met to avoid unnecessary disruption:
•
If removing an active Master switch, make sure that a valid Backup exists in the
stack.
• It is best to replace only one switch at a time.
• If replacing or removing multiple switches in a ring topology, when one switch has
been properly disconnected (see the procedures that follow), any adjacent
switch can also be removed.
• Removing any two, non-adjacent switches in a ring topology will divide the ring
and disrupt the stack.
Use the following procedures to replace a stack switch.
Removing a Switch from the Stack
1. Make sure the stack is configured in a ring topology.
Note: When an open-ended daisy-chain topology is in effect (either by design or
as the result of any failure of one of the stacking links in a ring topology),
removing a stack switch from the interior of the chain can divide the chain
and cause serious disruption to the stack operation.
2. If removing a Master switch, make sure that a Backup switch exists in the
stack, then turn off the Master switch.:
This will force the Backup switch to assume Master operations for the stack.
3. Remove the stack link cables from the old switch only.
4. Disconnect all network cables from the old switch only.
5. Remove the old switch from the chassis.
Installing the New Switch or Healing the Topology
If using a ring topology, but not installing a new switch for the one removed, close
the ring by connecting the open stack links together, essentially bypassing the
removed switch.
Otherwise, if replacing the removed switch with a new unit, use the following
procedure:
1. Make sure the new switch meets the stacking requirements on
page 148 .
2. Place the new switch in its determined place according to the RackSwitch
G8000 Installation Guide .
3. Connect to the ISCLI of the new switch (not the stack interface)
4. Enable stacking:
RS G8000(config)#
boot stack enable