46 Installing the Nortel Ethernet Routing SwitchConnecting cascade cables1. Base Unit2. Cascade Cable (connected from Base Unit Cascade Down connectorto Unit 2 Cascade Up connector)3. Cascade Cable (connected from Unit 2 Cascade Down connector toBase Unit Cascade Up Connector)Initial installation unit number assignmentWhen you install the stack, the software automatically determines thephysical order of all units in the stack according to the position of the baseunit within the stack. Thereafter, the individual units maintain their originalunit numbering, even if you change the position of one or more units inthe stack.For example, when you initially power the stack, the base unit becomes unit1 and the unit that the base unit connects to (across the Cascade Downcable) becomes unit 2. The next unit is designated as unit 3, and so on, untilthe maximum stack configuration (up to eight units) is reached. If anotherunit in the stack is designated as the base unit, the new base unit keepsits originally designated unit number in the stack.Stack MAC addressWhen a switch participates in a stack configuration, a stack MAC address isautomatically assigned during stack initialization. The stack MAC address isthe base unit MAC address plus 1. If another unit in the stack is assignedNortel Ethernet Routing Switch 4500 SeriesInstallation GuideNN47205-300 02.01 Standard5.0 23 February 2007Copyright © 2007, Nortel Networks Nortel Networks Confidential.
