Avaya 4000 Series - Stack health check; Stack Forced Mode

For accurate results, the internal loopback test must be run before the external loopback test.
The stack loopback tests can only be performed on a standalone unit with no traffic running
on the unit.
To run the test, first use the stack loopback-test internal command. To perform the
external loopback test, connect the stack uplink port with the stack downlink port. Use the
stack loopback-test external command.
For more detail regarding stack loopback testing, see Configuring System Monitoring on Avaya
Ethernet Routing Switch 4000 Series, NN47205-502.
Stack health check
Use this feature to run a high-level test to confirm stack operation and stack continuity. The
stack health check results give you information about the stacking state of the rear ports of
each switch, confirm the total number of switching units in the stack, confirm the number of
stacking cables used, and indicate which unit acts as base.
Use ACLI and Web-based management to inquire about the stack health status. This feature
is not available for standalone switching units.
For detailed information about stack health check, see Configuring System Monitoring on
Avaya Ethernet Routing Switch 4000 Series, NN47205-502.
Stack Forced Mode
The Avaya Ethernet Routing Switch 4000 Series may enter Stack Forced Mode (if configured
as such) after a stack of two units breaks into one or two standalone switches. The Stack
Forced Mode operation allows the standalone device that comes out of a broken stack of two
to be managed using the previous stack IP address. After a stack of two fails, you have access
to a device without the need of a standalone IP address.
The Stack Forced Mode applies to a standalone switch that was part of a stack of two units.
When functioning in this mode, the standalone switch keeps the previous stack IP settings (IP
address, netmask, gateway), which allows you to reach the device using an IP connection such
as Telnet, Web-based management, or Device Manager.
Stack Forced Mode can be configured for each device, regardless of stack or standalone mode.
If the Stack Forced Mode is enabled on a stack, it is enabled on all switches in that stack.
However, this mode only becomes active after a stack of two fails and one or both switches
become standalone.
Stack health check
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