Users Guide

Dell Networking OS Behavior: When you add a switch to a stack
• If you congure the new unit with a stack number that is already assigned to a stack member, the stack avoids a numbering conict by
assigning the new switch the rst available stack number.
• If the stack has been provisioned for the stack number that is assigned to the new unit, the pre-congured provisioning must match
the switch type. If there is a conict between the provisioned switch type and the new unit, a mismatch error message is displayed.
Merge Two Stacks
You may merge two stacks while they are powered and online.
To merge two stacks, connect one stack to the other using user port cables from the front end user portusing the mini-SAS cables from
the stacking ports.
• Dell Networking OS selects a master stack manager from the two existing managers based on the priority of the stack.
• Dell Networking OS resets all the units in the losing stack; they all become stack members.
• If there is no unit numbering conict, 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 cong on the losing stack members with its own to synchronize the
conguration on the new stack members.
Split a 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 oine. Each portion of the split stack
retains the startup and running conguration 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 unaected 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.
Stacking Conguration Tasks
Following are the stacking conguration tasks:
• Assigning Unit Numbers to Units in a Stack
• Creating a Virtual Stack Unit in a Stack
• Displaying Information About a Stack
• Inuencing Management Unit Selection on a Stack
• Managing Redundancy on a Stack
• Resetting a Unit on a Stack
• Recover from Stack Link Flaps
Assigning Unit Numbers to Units in an Stack
Each unit in the stack has a stack number that is either assigned by you or Dell Networking OS.
Units are numbered from 1 to 6. Stack numbers are stored in NVRAM and are preserved upon reload.
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Stacking