Avaya 4500 Series Installation Manual page 56

Installing the Avaya Ethernet Routing Switch
Figure 18: Connecting cascade cables
1. Base Unit
2. Cascade Cable (connected from Base Unit Cascade Down connector to Unit 2
3. Cascade Cable (connected from Unit 2 Cascade Down connector to Base Unit
Initial installation unit number assignment
When you install the stack, the software automatically determines the physical order of all units
in the stack according to the position of the base unit within the stack. Thereafter, the individual
units maintain their original unit numbering, even if you change the position of one or more
units in the stack.
For example, when you initially power the stack, the base unit becomes unit 1 and the unit that
the base unit connects to (across the Cascade Down cable) becomes unit 2. The next unit is
designated as unit 3, this continues until the maximum stack configuration (up to eight units)
is reached. If another unit in the stack is designated as the base unit, the new base unit keeps its
originally designated unit number in the stack.
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
56 Installation
Cascade Up connector)
Cascade Up Connector)
November 2010