Nortel 425-24T, Configuration Manual, Page: 89 / 488

Chapter 1 About Ethernet Switches 325 and 425 89
System Configuration Guide
For example, when you initially power up the stack, the base unit becomes unit 1
and the unit that the base unit connects to becomes unit 2 (and the next unit is unit
3 and so on), until the maximum stack configuration (up to 8 units) is reached. If
you change the base unit to another unit in the stack, the new base unit keeps its
original unit number in the stack.
Stack MAC address
When the switch is participating in a stack configuration, a stack MAC address is
automatically assigned during the stack initialization. The base unit’s MAC
address, with a software offset, is used for the stack MAC address.
For example, if the base unit’s MAC address is 00-00-82-99-44-00, and the stack
software offset is
1F,
then the stack MAC address becomes:
00-00-82-99-44-1F
If another unit in the stack is assigned as the base unit, the MAC address of the
new base unit (with offset) now applies to the stack configuration. The original
stack IP address still applies to the new base unit.
Removing a unit from the stack
If a unit is removed from the stack (therefore operating in standalone mode), the
following switch configuration settings revert back to the settings configured
before the unit became a member of the stack:
• IP address
• Console password
• Telnet password
• SNMP community strings
Note:
Before you can add a new switch to an existing stack, you must
set the spanning tree mode on the switch to match the spanning tree
mode on the stack.