Replacing Or Removing Stacked Switches; Removing A Switch From The Stack; Installing The New Switch Or Healing The Topology - Lenovo Flex System Fabric CN4093 Application Manual

Replacing or Removing Stacked Switches

Removing a Switch from the Stack

1. Make sure the stack is configured in a ring topology.
2. If removing a Master switch, make sure that a Backup switch exists in the stack,
then turn off the Master switch.
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.

Installing the New Switch or Healing the Topology

1. Make sure the new switch meets the stacking requirements on page
2. Place the new switch in its determined place according to the CN4093 10Gb
Converged Scalable Switch Installation Guide.
3. Connect to the ISCLI of the new switch (not the stack interface)
4. Enable stacking:
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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.
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.
This will force the Backup switch to assume Master operations for the stack.
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:
CN4093(config)# boot stack enable
202.
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Chapter 14: Stacking