Stack Configurations - Avaya 4826GTS Installing Manual

Installing the Avaya Ethernet Routing Switch
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 the
stack cables.
4. Turn on the new unit. Depending on the software load on the replacement switch, it can
automatically restart one or two times before joining the stack as a fully operational member.
5. Check the log file on the stack to ensure that the replacement unit correctly joined the stack.
The log file displays AUR information messages.
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.
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 to number in this manner
throughout the stack. In this configuration, the base unit discovers the stack in a cascade down
August 2016 Installing Avaya ERS 4800 Series
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