Users Guide

CONFIGURATION mode
stack-unit 0 stack-group group-number
• stack-unit 0 denes the default ID unit-number in the initial conguration of a switch.
• stack-group group-number congures a group of 10 GbE ports or a single 40 GbE port for stacking.
5. Save the stacking conguration.
EXEC Privilege mode
write memory
6. Reload the switch. Dell networking OS automatically assigns a number to the new unit and adds it as member switch in the
stack.
EXEC Privilege mode
reload
The new unit synchronizes its running and startup congurations with the stack.
To add a standalone switch which has stack groups already congured to a stack, use the next steps.
7. Attach port cables to connect the ports in pre-congured stack groups to one or more switches in the stack.
8. Power on the switch. Dell networking OS automatically assigns a number to the new unit and adds it as member switch in the
stack.
The new unit synchronizes its running and startup congurations with the stack.
Dell Networking OS Behavior: When you add a new switch to a stack:
• When you add a unit to a stack, the management unit performs a system check on the new unit to ensure the hardware type
(S5000) is compatible. The Dell Networking OS version performs a similar check. If the stack is running 9.1(1.0) and a new unit is
running a dierent software version, the new unit is put into a card problem state. The new unit is then upgraded to use the
same Dell Networking OS version as the stack and is rebooted before joining the stack.
• If the new unit has been congured 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.
• After the new unit loads, it synchronizes its running and startup congurations with the stack.
Merging Two Stacks
You can merge two S5000 switch stacks while they are powered and online.
To merge two stacks, connect one stack to the other using port cables. After you connect the port cables, the two stacks merge:
• Dell networking OS selects a master switch for the merged stack from the existing masters in the two stacks.
To ensure that one of the two master switches wins the master election in the merged stack, use the stack-unit priority
command to congure the highest priority for the unit (refer to Assigning a Priority to Stacked Switches).
• All the units in the losing stack reboot and then merge with the winning stack that has the stack master.
• If there is no unit numbering conict, 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 congurations to synchronize the congurations on the new stack
members.
NOTE: Adding a new unit that is powered on and has stack groups congured is the same as merging two stacks (refer to
Adding a Stack Unit). If the new unit is congured 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.
Stacking
829