Allied Telesis AT-8000GS/24, AT-8000GS/POE manual Stacking Overview, Stacking Ring Topology

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Chapter 3: Stacking

Stacking Overview

Stacking Ring Topology

Stacking provides multiple switch management through a single point as if all stack members are a single unit. All stack members are accessed through a single IP address through which the stack is managed. The stack can be managed using the following interfaces:

ˆWeb-based Interface

ˆSNMP Management Station

ˆCommand Line Interface (CLI)

Devices support stacking up to six units per stack, or can operate as stand-alone units. During the Stacking setup, one switch is selected as the Stacking Master and another stacking member can be selected as the Secondary Master. All other devices are selected as stack members, and assigned a unique Unit ID.

Switch software is downloaded separately for each stack member. However, all units in the stack must be running the same software version.

Switch stacking and configuration is maintained by the Stacking Master. The Stacking Master detects and reconfigures the ports with minimal operational impact in the event of:

ˆUnit Failure

ˆInter-unit Stacking Link Failure

ˆUnit Insertion

ˆRemoving a Stacking Unit

ˆThis section includes the following topics:

ˆ“Stacking Ring Topology,” next

ˆ“Stacking Chain Topology,” next

ˆ“Stacking Members and Unit ID,” next

ˆ“Removing and Replacing Stacking Members,” next

ˆ“Exchanging Stacking Members,” next

Stacked devices operate in a Ring topology. A Ring topology is where all devices in the stack are connected to each other forming a circle. Each stacked device accepts data and sends it to the device to which it is physically connected. The packet continues through the stack until it reaches the destination port. The system automatically discovers the optimal path on which to send traffic.

Most difficulties in Ring topologies occur when a device in the ring becomes non-functional, or a link is severed. In a stack, the system

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Contents Installation Guide Page Preface Safety Symbols Used in this Document Symbol Meaning DescriptionWhere to Find Web-based Guides Management Software Updates Contacting Allied TelesisContent Page Overview ChapterAT-8000GS Switch Series Features ˆ PVEIeee Standards ˆ Ieee 802.3 10Base-T ˆ Ieee 802.3u 100Base-TXˆ 2 Stacking Ports Two Hdmi connector stacking ports Model DescriptionsAT-8000GS/24POE Gigabit Ethernet Switch Front Panel 24POEAT-8000GS/48 Gigabit Ethernet Switch Front Panel Port Descriptions 10/100/1000 Base Gigabit Ethernet Ports SFP PortRJ-45 Console Port ATI Reference Vendors and PartsLED Definitions System LEDsStacking Port LEDs IndicationLED Indication Description SYSLED RJ-45 Port LEDs on AT-8000GS/24 & AT-8000GS/48 LED Description LED Indication Functional DescriptionPort LED LinkLED FDX RJ-45 Port LEDs AT-8000GS/ 24POE Description IndicationPOE Green Off No link is established on the port Stacking Port LEDs Overview Installation Reviewing Safety Precautions AT-8000GS Series Gigabit Ethernet Switch Installation Guide Please return damaged units for servicing Preparing for Installation Installation PrecautionsPackage Contents Site Requirements UnpackingPage Installing the Device Desktop or Shelf InstallationAttaching the Mounting Brackets Connecting the Device Connecting Switch to a TerminalAC Power Connection Stacking Stacking Overview Stacking Ring TopologyStacking Members Unit ID Removing Replacing Stacking Chain TopologyStacking Exchanging Stacking Members Configuring Stacking Page Stacking Initial Configuration Configuration Overview Configuration Static IP Address and Subnet MaskIllustrated in the following example Troubleshooting Cannot connect using Telnet, Web browser, or Snmp softwareDevice not operating correctly Forgot or lost the password Technical Specifications Physical SpecificationsWeight Environmental SpecificationsPower Specifications Power Supply for Non-POE modelCertifications Cable, Port, and Pinout InformationPin Connections for the 10/100/1000 Ethernet Interface RJ-45 Pin AllocationAppendix a Technical Specifications
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