Stack MAC address
When a switch participates in a stack configuration, stack initialization automatically assigns a stack
MAC address. 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.
Temporary base unit
If an assigned base unit fails, the next unit in the stack order automatically becomes the new
temporary base unit. The LED display on the front panel of the temporary base unit changes to a
steady amber state to indicate the change. When this happens, use the Unit Select switch to
designate the temporary base unit as the base unit until you repair or replace the failed base unit.
You must designate a base unit because the automatic failover is only a temporary safeguard and, if
the original unit rejoins the stack, it does not resume base unit status. Also, if the stack configuration
loses power, the temporary base unit does not resume base unit status when power is restored.
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 continues
after successive failures until only two units are left in the stack.
Redundant cascade stacking
You can stack up to eight units into a dual-path cascade stack. If any single unit fails, or if a cable is
accidently disconnected, other units in the stack remain operational.
In addition to increasing bandwidth, the software uses the cables to provide two paths between
units. If one path is interrupted, the data travels over the remaining path at half the normal
interswitch bandwidth.
The following figure shows a typical example of a stack configuration reacting to a failed connection
in the stack configuration.
Installing the Avaya Ethernet Routing Switch
August 2016 Installing Avaya ERS 4800 Series 38
Comments on this document? infodev@avaya.com
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