Alcatel-Lucent 6600 manual Stack Overview, Stack Composed of Four OmniSwitch 6648 Switches

Managing OmniSwitch 6600 Family Stacks Stack Overview

Stack Overview

By default, OmniSwitch 6600 Family switches operate in stand-alone mode. You can also configure two to eight OmniSwitch 6600 Family switches (in any combination of OmniSwitch 6624, 6600-U24, 6600- P24, 6648, 6602-24, and 6602-48 switches) into one large virtual chassis known as a stack. With stacks, you can easily expand your switching capacity simply by adding additional switches. For example, you can start with a stack composed of two switches and add switches (up to eight) as network demands increase.

Note on Terminology. In the user guides provided with your OmniSwitch 6600 Family switch, the terms switch, slot and NI (Network Interface) refer to individual OmniSwitch 6600 Family units in stand-alone mode or within a stack. The term CMM (Chassis Management Module) refers to OmniSwitch 6600 Family units operating in a stack in a primary or secondary CMM role. (OmniSwitch 6600 Family switches operating in an idle CMM role would normally be referred to as a switch, slot, or, NI.)

Stacks also provide enhanced resiliency and redundancy features. If a switch in a stack goes down or is offline, the stack will continue to operate without user intervention. In addition, when a switch auto- synchronizes at boot-up or if you manually synchronize the switches (see “Synchronizing Switches in a Stack” on page 4-17for more information) switch operating software and configuration parameters are backed up on all switches in the stack. Therefore if software is corrupted or damaged the original operat- ing software and parameters can be recovered.

Switches are connected to each other in a stack with stacking modules. (See Chapter 2, “OmniSwitch 6600 Family Chassis and Hardware Components,” in this manual for more information.) These stacking modules provide high-speed, dual-redundant links between switches in a stack. The figure below shows an example of a stack composed of four switches. Every switch in a stack is connected to other switches in a stack in a dual-redundant “daisy-chain” manner.

This stack is composed of four OmniSwitch 6648 switches. All switches in this stack are connected together in a dual-redundant “daisy-chain” manner.

	66	24
	itch
OmniSw
CONSOLE
	SEL
	66	24
	itch
Om	niSw
	E
CONSOL
	SEL
	66	24
	itch
Om	niSw
	E
CONSOL
	SEL
	66	24
	itch
Om	niSw
	E
CONSOL

	NSI	ON
EXPA
	NSI	ON
EXPA
	NSI	ON
EXPA
	SIO	N
EXPAN

				CKIN	G
			/STA
	NSI	ON
EXPA
				CKIN	G
			/STA
	NSI	ON
EXPA
				KIN	G
	NSI	ON	/STAC
EXPA

				CKIN	G
			/STA
	NSI	ON
EXPA

SEL

A Stack Composed of Four OmniSwitch 6648 Switches

OmniSwitch 6600 Family Hardware Users Guide September 2006 page 4-3