Reference Guide

• 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 FTOS 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 FTOS
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 FTOS.
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
Creating a Virtual Stack Unit on an S-Series Stack
Use virtual stack units to configure ports on the stack before adding a new unit.
• Create a virtual stack unit.
CONFIGURATION mode
stack-unit provision
Displaying Information about an S-Series Stack
To display information about the S-Series stack, use the following command.
• Display for stack-identity, status, and hardware information on every unit in a stack.
EXEC Privilege mode
show system
777