Replacing Or Adding A Stack Unit; Removing A Stack Unit; Checking Light Emitting Diode On The Switch - Avaya 4900 Series Installing

Replacing or adding a stack unit

Use the following procedure to replace a failed stack unit or insert a new unit into a stack.
Important:
Automatic Unit Replacement (AUR) for both configuration and software is enabled for all switch
platforms and software releases. This means that the agent code image, on a replacement unit,
is automatically upgraded or downgraded 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.
Procedure
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.

Removing a stack unit

If you remove a unit from the stack (to operate in standalone 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

Checking Light Emitting Diode on the switch

The figures and tables in the following sections describe the LEDs on the switch. The tables
describe LED operation for a switch that finishes the power-on self-test.
February 2016 Installing Avaya Ethernet Routing Switch 4900 Series
Comments on this document? infodev@avaya.com
Checking Light Emitting Diode on the switch
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