Reference Guide

• Dell Networking OS resets all the units in the losing stack; they all become stack members.
• If there is no unit numbering conflict, the stack members retain their previous unit numbers.
Otherwise, the stack manager assigns new unit numbers, based on the order that they come online.
• The stack manager overwrites the startup and running config on the losing stack members with its
own to synchronize the configuration on the new stack members.
Split an S-Series Stack
To split a stack, unplug the desired stacking cables.
You may do this at any time, whether the stack is powered or unpowered, and the units are online or
offline. Each portion of the split stack retains the startup and running configuration of the original stack.
For a parent stack that is split into two child stacks, A and B, each with multiple units:
• If one of the new stacks receives the master and the standby management units, it is unaffected by
the split.
• If one of the new stacks receives only the master unit, that unit remains the stack manager, and Dell
Networking OS elects a new standby management unit.
• If one of the new stacks receives only the standby unit, it becomes the master unit of the new stack,
and Dell Networking OS elects a new standby unit.
• If one of the new stacks receives neither the master nor the standby management unit, the stack is
reset so that a new election can take place.
S-Series Stacking Configuration Tasks
The following are configuration tasks for the S-Series.
• Assigning Unit Numbers to Units in an S-Series Stack
• Creating a Virtual Stack Unit on an S-Series Stack
• Displaying Information about an S-Series Stack
• Influencing Management Unit Selection on an S-Series Stack
• Managing Redundancy on an S-Series Stack
• Resetting a Unit on an S-Series Stack
• Recover from Stack Link Flaps
Assigning Unit Numbers to Units in an S-Series Stack
Each unit in the stack has a stack number that is either assigned by you or Dell Networking OS.
Units are numbered from 0 to 11, however, you can only stack six S4820T units. Stack numbers are stored
in NVRAM and are preserved upon reload.
• Assign a stack-number to a unit.
EXEC Privilege mode
stack-unit renumber
Renumbering the stack manager triggers the whole stack to reload, as shown in the message below.
When the stack comes back online, the master unit remains the management unit.
Renumbering master unit will reload the stack.
WARNING: Interface configuration for current unit will be lost!
Proceed to renumber [confirm yes/no]: yes
Stacking
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