Stack Configurations - Avaya 4500 Series Installation Manual

to match the software running on the stack. In addition, when a like-for-like replacement of
a failed unit occurs, any port-specific configuration is restored .
1. Remove the failed switch from the stack.
2. Obtain a like-for-like replacement switch.
3. With the new unit turned off, physically insert the new unit in the stack and reconnect
4. Turn on the new unit. Depending on the software load on the replacement switch,
5. Check the log file on the stack to ensure that the replacement unit correctly joined
If you replace the base unit, remember that the stack has elected a temporary base unit and
the new unit does not automatically assume the base unit status. Configure the new unit as
the base unit, using the Unit Select switch, and reset the Unit Select switches of the other stack
members to nonbase units.
Remove a stack unit
If you remove a unit from the stack (to operate in stand-alone mode), the following switch
configuration settings revert to those configured before the unit became a member of the stack:
• IP address
• Web, Telnet, and SNMP passwords
• SNMP community strings

Stack configurations

Because stack parameters are associated with the base unit, the physical stack order depends
on the base unit position and whether you configure the stack cascade up (stack up) or cascade
down (stack down). This designation depends on the stack cabling arrangement. Avaya
recommends that you use Cascade Down configuration. See
Cascade down
In a cascade down configuration, the base unit is located at the top of the stack. The system
automatically numbers the physical units based on the designated base unit (unit 1). The cable
connected to the Cascade Down connector of the base unit terminates in the Cascade Up
connector on the next unit in the stack, which is located below the base unit. This next unit is
designated unit 2. The stack is wired downward through the units and the system continues
Installation
the stack cables.
it can automatically restart one or two times before joining the stack as a fully
operational member.
the stack. The log file displays AUR information messages.
Stack configurations
Cascade down on page 59.
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