Stack Member Numbers - Cisco WS-C3750-48PS-S Software Configuration Manual

Understanding Switch Stacks

Stack Member Numbers

The stack member number (1 to 9) identifies each member in the switch stack. The member number also
determines the interface-level configuration that a stack member uses. You can display the stack member
number by using the show switch user EXEC command.
A new, out-of-the-box switch (one that has not joined a switch stack or has not been manually assigned
a stack member number) ships with a default stack member number of 1. When it joins a switch stack,
its default stack member number changes to the lowest available member number in the stack.
Stack members in the same switch stack cannot have the same stack member number. Every stack
member, including a standalone switch, retains its member number until you manually change the
number or unless the number is already being used by another member in the stack.
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As described in the hardware installation guide, you can use the switch port LEDs in Stack mode to
visually determine the stack member number of each stack member.
Catalyst 3750 Switch Software Configuration Guide
5-6
If you manually change the stack 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 stack member resets (or after you use the
reload slot stack-member-number privileged EXEC command) and only if that number is not
already assigned to any other members in the stack. For more information, see the
Stack Member Number" section on page
by changing the SWITCH_NUMBER environment variable, as explained in the
Environment Variables" section on page
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 number of a stack member and no interface-level configuration is
associated with that new member number, that stack member resets to its default configuration. For
more information about stack member numbers and configurations, see the
Configuration Files" section on page
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 retains 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.
If you merge switch stacks, the switches that join the switch stack of a new stack master select the
the lowest available numbers in the stack. For more information about merging switch stacks, see
the "Switch Stack Membership" section on page
5-17. Another way to change the stack member number is
4-14.
5-12.
5-3).
Chapter 5 Managing Switch Stacks
"Assigning a
"Controlling
"Switch Stack
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