Allied Telesis AT-GS950/8 manual Trunking Overview, Trunking Guidelines Trunking Algorithm

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Chapter 4: Trunking

Trunking Overview

Trunking Guidelines

Trunking Algorithm

A port trunk is an economical way for you to increase the bandwidth between the Ethernet switch and another networking device, such as a network server, router, workstation, or another Ethernet switch. A port trunk is a group of ports that have been grouped together to function as one logical path. A port trunk, therefore, increases the bandwidth between the switch and the other network device and is useful in situations where a single physical link between the devices is insufficient to handle the traffic load. The AT-S82 management software provides for four trunks with a maximum of two ports each.

Because network vendors employ different techniques to implement trunking, a trunk on one device might not be compatible with the same feature on a device from another manufacturer. Therefore, trunks are typically made only between devices from the same vendor.

If a port in a static trunk loses its link, the trunk’s total bandwidth is reduced until the lost link is reconfigured.

The following are guidelines for setting up trunking:

ˆTo ensure compatibility, set up trunks only between AT-GS950/8 devices.

ˆThe trunk always contains two ports, one of which is designated the master port.

ˆThe AT-S82 management software is preconfigured for you to select trunks 1, 2, 3, or 4, with ports preassigned to each trunk. Trunk 1 has ports 1 and 2, trunk 2 has ports 3 and 4, and so forth. You cannot alter either setting.

ˆBefore you create a trunk, examine the speed, duplex mode, and flow control settings of all the ports that will be in the trunk. Verify that the port settings are identical.

ˆAfter you create a trunk, do not change the speed, duplex mode, or flow control setting of any port in the trunk without making the same changes to the other ports.

ˆThe ports of the trunk must be members of the same VLAN.

ˆThe switch selects the lowest numbered port in the trunk to handle broadcast packets and packets of unknown destination. For example, in trunk 2 containing ports 3 and 4, port 3 is used for broadcast packets.

One of the steps in creating a trunk is the selection of a load distribution method, also known as the trunking (or load distribution) algorithm. This algorithm determines how the switch distributes the traffic load across the ports of the trunk. The AT-S82 management software provides three load

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Contents Management Software Page Contents Contents Figures Figures Preface Where to Find Web-based Guides Management Software Updates Contacting Allied TelesisPreface Getting Started ChapterStarting a Management Session Main Save Configuration Click Apply Saving ChangesQuitting a Management Session Getting Started Basic Switch Parameters Basic Switch Parameters AT-S82 Management Software User’s Guide Disabling or Enabling Ping Blocking EnabledDisabled Enabling or Disabling 802.1X Forwarding Control Changing the Administrator’s Password Rebooting the Switch Resetting the Switch and Retaining the IP Address Reset Click Apply Switch is resetAT-S82 Management Software User’s Guide Downloading New Firmware Download Status MessagePort Configuration Configuring Port Parameters Port is enabled. This is the default Copper FiberTrunking Trunking Overview Trunking Guidelines Trunking AlgorithmAT-S82 Management Software User’s Guide Configuring the Trunking Algorithm DAxorSASetting up the Trunk Port Trunking ConfigurationTrunking Port Mirroring Port Mirroring Overview Configuring Port Mirroring Port Mirroring VLANs Vlan Features Increased Performance Improved Manageability SecurityAT-S82 Management Software User’s Guide Vlan Overview Vlan Identifier Vlan Port MembersIncoming Outgoing Tagged Untagged Frames Guidelines for Creating a Vlan Working with VLANs Vlan DetailDisplaying all VLANs Click Show All Static Vlan EntriesVlan Protected Ports Vlan Protected Ports Vlan ExampleAT-S82 Management Software User’s Guide VLANs Class of Service Class of Service Overview Mapping Ports to Egress QueuesIeee 802.1p Priority Level Port Priority Queue Port Egress Queue Maximum Number Packets Mapping Priorities to Queues Setting Up the Schedule Assigning Priority to Ports Class of Service Spanning Tree Protocol STP Spanning Tree Overview Bridge Priority RootPath Costs and Port Costs Increment Bridge PriorityPort Speed Port Cost Port Priority Increment Port PriorityHello Time and Bridge Protocol Data Units BPDUs Point-to-Point and Edge Ports Edge Port Spanning Tree and VLANs Spanning Tree Protocol STP Configuring Spanning Tree Rstp STP CompatibleDisabled Configuring STP Port Settings Yes FalseTrue AutoSpanning Tree Protocol STP
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