Thereafter, the individual units maintain their original unit numbering, even if the position of
one or more units in the stack is changed.
For example, when the stack is initially powered, the base unit becomes unit 1 and the unit
that the base unit connects to (via the Cascade Down cable) becomes unit 2 (and the next unit
is unit 3 and so on), until the maximum stack configuration (up to eight units for a 5600 Series
stack) is reached. If the base unit is changed to another unit in the stack, the new base unit
keeps its original unit number in the stack.
When a switch participates in a stack configuration, a stack MAC address is automatically
assigned during stack initialization. The stack MAC address is the base unit MAC address plus
1. If another unit in the stack is assigned as the base unit, the new stack MAC address is the
MAC address of the new base unit plus 1. The original stack IP address still applies to the new
base unit.
If an assigned base unit fails, the next unit in the stack order automatically becomes the new
temporary base unit. This change is indicated by the Base LED on the temporary base unit
LED display panel moving to a steady amber state.
This automatic failover is a temporary safeguard only. If the stack configuration loses power,
the temporary base unit will not power up as the base unit when power is restored. Also, if the
original unit rejoins the stack, it will not resume base unit status. For this reason, always assign
the temporary base unit as the base unit until the failed unit is repaired or replaced.
Important:
If the temporary base unit is not assigned as the new base unit, and the temporary base unit
fails, the next unit in the stack order becomes the temporary base unit. This process will
continue after successive failures until only two units are left in the stack.
Regardless of stack configuration, the following applies:
• When power is applied to the stack the base unit initializes, typically within 60 seconds,
and the entire stack powers up as a single logical unit.
• A RS-232 communications cable can be attached to the console port of any switch in the
stack to establish a console connection.
• A software upgrade can be performed on the stack from any switch using the console
interface, a Telnet session, the Enterprise Device Manager interface, or any SNMP-based
management software.
• The stack can be managed using a Telnet session, Enterprise Device Manager interface,
or any SNMP-based management software through any stack switch port.
Cascade down
The system automatically numbers the physical units based on the designated base unit (Unit
1). In a cascade down configuration, the base unit is physically located as the top unit in the
stack. 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 physically located below the base
Installation fundamentals
20 Installing Avaya Ethernet Routing Switch 5000 Series December 2013
Comments? infodev@avaya.com
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