Nortel 4524GT Installation Manual

Also see for 4526FX: Overview-System Configuration Configuration Installation Product information

Contents

Nortel 4524GT Installation Manual Manual pdf 57 page image

Nortel Ethernet Routing Switch 4500 series stacking 573. 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 assignedas the base unit, the new stack MAC address is the MAC address of thenew base unit plus 1. The original stack IP address still applies to the newbase unit.Temporary base unitIf an assigned base unit fails, the next unit in the stack order automaticallybecomes the new temporary base unit. The LED display on the front panelof the temporary base unit changes to a steady amber state to indicate thechange. When this happens, use the Unit Select switch to designate thetemporary base unit as the base unit until you repair or replace the failedbase unit.You must designate a base unit because the automatic failover is onlya temporary safeguard and, if the original unit rejoins the stack, it doesnot resume base unit status. Also, if the stack configuration loses power,the temporary base unit does not resume base unit status when poweris restored.ATTENTIONIf the temporary base unit is not assigned as the new base unit, and the temporarybase unit fails, the next unit in the stack order becomes the temporary baseunit. This process continues after successive failures until only two units are leftin the stack.Nortel Ethernet Routing Switch 4500 SeriesInstallation GuideNN47205-300 (322811-B) 03.01 Standard5.1 19 November 2007Copyright © 2007, Nortel Networks.