Reference Guide

The resulting ring topology allows the entire stack to function as a single switch with resilient fail-over
capabilities. If you do not connect the last switch to the first switch (Step 4), the stack operates in a daisy
chain topology with less resiliency. Any failure in a non-edge stack unit causes a split stack.
Accessing the Stack CLI
To configure a stack, access the CLI through the stack master using the console port or a VTY line.
• Console access: You can access the stack through an attached console connection to the master
switch to log in to the CLI. Console access to the stack CLI is available on the master. The console
port of the standby unit does not provide management capability; only a limited number of
commands are available.
• Remote access: You can access the stack CLI using the IP address of the dedicated management
Ethernet interfaces on the master switch through an SNMP, SSH, or Telnet connection.
Assigning a Priority to Stacked Switches
By default, each stack unit is assigned priority 0.
The switch with the highest priority number is elected master. The switch with the next highest priority
number is elected standby and takes over stack management if the master switch fails. The range of valid
priority values is from 1 to 14.
To configure or revert assigning stacked switch priority, use the following commands.
1. Configure a stack so that the roles are assigned according to pre-determined priorities instead of
using the highest MAC addresses.
Global Configuration mode
stack-unit priority
2. Revert the management priority of a stack unit to the default value of 0.
Global Configuration mode
no stack-unit unit-number priority number
NOTE: If you reconfigure the priorities of stacked switches in an existing S5000 stack, reload the
stack so that a new master and standby election performs.
Renumbering a Stack Unit
By default, each stack unit is assigned the unit-number 0.
When you renumber a stacked switch in an existing stack:
• If you renumber the master switch, you are prompted to reload the entire stack.
• If you renumber the standby switch, only the switch reloads and is replaced by a member switch that
is elected as the new standby.
• If you renumber a member switch, only the member switch reloads.
• If you renumber a switch to a number already assigned to another stack unit, an error message
displays.
• Renumber a stack unit to pre-configure the numbering of the master, standby, and member units.
EXEC Privilege mode
stack-unit renumber
914
Stacking