Users Guide

• If there is no unit numbering conflict, the stack members retain their previous unit numbers. Otherwise,
the stack master assigns new unit numbers, based on the order in which they come online.
• The new stack master uses its own startup and running configurations to synchronize the configurations
on the new stack members.
NOTE: Adding a new unit that is powered on and has stack groups configured is the same as merging two
stacks (refer to Adding a Stack Unit). If the new unit is configured with a higher priority than the current
stack master, it becomes the new stack master and the stack reloads. If the new unit does not have a
higher priority than the master switch, it reboots and is added as a member switch.
Split a Stack
To split an S5000 stack, unplug the port cables between member units at any time: while the stack is
powered on or off and when the units are online or offline.
Each portion of the split stack retains the startup and running configuration of the original stack.
For a stack that is split into two smaller stacks, each with multiple units:
• If one of the new stacks receives the master and standby units, it is unaffected by the split.
• If one of the new stacks receives only the master unit, the master switch retains its role and a new
standby is elected.
• If one of the new stacks receives only the standby unit, it becomes the master in the new stack and Dell
Networking OS elects a new standby.
• If one of the new stacks does not receive either the master or the standby unit, the stack is reset so that
a new election takes place.
Managing Redundant Stack
Management
To manage the redundancy behavior in a stack, use the following redundancy commands.
• Reset the current stack master and make the standby unit the new master.
EXEC Privilege mode
redundancy force-failover stack-unit
A new standby is elected. When the previous stack master comes back online, it becomes a member unit.
• Prevent the stack master or stack unit from rebooting after a failover.
CONFIGURATION mode
redundancy disable-auto-reboot stack-unit
This command does not affect a forced failover, manual reset, or a stack-link disconnect.
• Display redundancy information.
EXEC Privilege mode
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