Member Numbers; Member Priority Values - Cisco Catalyst 2975 Software Configuration Manual

Understanding Stacks

Member Numbers

The member number (1 to 9) identifies each member in the stack. The member number also determines
the interface-level configuration that a member uses.
A new, out-of-the-box switch (one that has not joined a stack or has not been manually assigned a
member number) ships with a default member number of 1. When it joins a stack, its default stack
member number changes to the lowest available member number in the stack.
Members in the same stack cannot have the same member number.
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See the following sections for information about stack member configuration:
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Member Priority Values

A high priority value for a member increases the chance that it will be elected master and keep its
member number. The priority value can be 1 to 15. The default priority value is 1.
We recommend that you assign the highest priority value to the switch that you want to be the stack
Note
master. The switch is then re-elected as master if a re-election occurs.
The new priority value takes effect immediately but does not affect the current master until the current
master or the stack resets.
Catalyst 2975 Switch Software Configuration Guide
6-6
If you manually change the member number by using the switch current-stack-member-number
renumber new-stack-member-number global configuration command, the new number goes into
effect after that member resets (or after you use the reload slot stack-member-number privileged
EXEC command) and only if that number is not already changed.
You can also change the stack member number is by using the SWITCH_NUMBER environment
variable.
If the number is being used by another member in the stack, the switch selects the lowest available
number in the stack.
If you manually change the member number and no interface-level configuration is associated with
that number, that member resets to its default configuration.
You cannot use the switch current-stack-member-number renumber new-stack-member-number
global configuration command on a provisioned switch. If you do, the command is rejected.
If you move a stack member to a different switch stack, the stack member keeps its number only if
the number is not being used by another member in the stack. If it is being used by another member
in the stack, the switch selects the lowest available number in the stack.
The procedure to change a member number, see the
page 6-19.
The SWITCH_NUMBER environment variable, see the
section on page 3-21.
Member numbers and configurations, see the
Merging stacks, see the "Stack Membership" section on page
Chapter 6
"Assigning a Member Number" section on
"Controlling Environment Variables"
"Stack Configuration Files" section on page
6-3.
Managing Switch Stacks
6-13.
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