KTI Networks KGS-2404 manual Link Aggregation

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3-6. Link Aggregation

Basically, Link Aggregation is to aggregate the bandwidth of more than one port to an assigned logical link. This highly increases total bandwidth to the targeted device. There is more than one Link Aggregation technology in many vendors’ switch products already, which may cause the problem of interoperability. This is the reason why now we have 802.3ad Link Aggregation Control Protocol (LACP).

Why 802.3ad (LACP)?

Network is varying. For example, if a port malfunctioned or unplugged accidentally in a static trunk port, administrator has to reconfigure it, or the network will get trouble. Therefore, offering a tool with automatic recovery capability is necessary for an administrator. LACP is a protocol that allows a switch able to know whether its partner has the capability to co-setup a trunk between them.

Usually, if administrator wishes to increase the bandwidth of a specific link, he may:

1.Buy new network equipments with higher throughput, or

2.Aggregate the bandwidth of more than one port to a logical link.

If the item 1 is the case, you will pay much more cost beyond your budget, and the solution caused by the limitation of hardware performance may not be scalable.

If the item 2 is the case, now you do not have to pay much more extra cost and can keep flexible according to the demand of bandwidth because all equipments are there already. And what’s more, you can avoid worrying about the interoperability issue. Applying LACP in your network, you will not only gain benefits below to improve the performance of your network but also have these investments usable to future new products.

1.Public standardized specification

2.No interoperability issue

3.No change to IEEE 802.3 frame format, no change in software and management.

4.Increased bandwidth and availability

5.Load sharing and redundancy

6.Automatic configuration

7.Rapid configuration and reconfiguration

8.Deterministic behavior

9.Low risk of duplication or mis-ordering

10.Support existing IEEE 802.3 MAC Clients

11.Backwards compatibility with aggregation-unaware devices

There are also some constraints when applying LACP.

1.LACP does not support inter-switch bandwidth aggregation.

2.The ports aggregated must operate in full-duplex mode.

3.The ports in the same Link Aggregation Group must have the same speed, for example, all with 100Mbps or all 1000Mbps. You cannot aggregate a 1000Mbps and two 100Mbps for a 1.2Gbps trunk port.

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Contents KGS-2404 Page Release Table of Contents 100 Federal Communications Commission FCC Statement 06/28/2007 03/13/2007 02/10/2007About this user’s manual Overview of 24-Port GbE Web Smart Switch Key Features in the DeviceVlan Management ChecklistFeatures HardwarePage User Interfaces on the Front Panel Button, LEDs and Plugs View of 24-Port GbE Web Smart Switch10/100/1000Ethernet TP Port 1 to 24 LED LED IndicatorsUser Interfaces on the Rear Panel System LEDFront View of 1000Base-SX/LX LC, SFP Fiber Transceiver View of the Optional ModulesStarting 24-Port GbE Web Smart Switch Up Hardware and Cable InstallationConnecting the SFP Module to the Chassis Firmware Loading TP Port and Cable InstallationPower On Cabling RequirementsCabling Requirements for 1000SX/LX SFP Module Cabling Requirements for TP PortsTypical Network Topology in Deployment 1000Base-X TP, Fiber 100Base-TX TP 100Base-FX FiberNo Vlan Configuration Diagram Case 2b Port-based Vlan See -4 Page Management through Ethernet Port Managing 24-Port GbE Web Smart Switch through Ethernet PortIP Address Assignment Login Screen for Web110 10000000.00000001.00000010.1 Prefix Length No. of IP matched No. of Addressable IP Page 10 Network Connection between Remote Site and Central Site Typical Applications11 Peer-to-peer Network Connection What’s the Ethernet Basic Concept ManagementIEEE802.3 CSMA/CD MAC Snap STP BpduARP SAP Format Media Access Control MACFCS PRE SFDPage How does a MAC work? Bytes DTE Flow Control Page Bits How does a switch work? Collision Domain Page Page Virtual LAN Page Tag Format CFIPage Page VID Link Aggregation 10 Example of Link Aggregation Application Operation of Web-based Management Web Management Home Overview Information of Page Layout Snmp Lacp RstpFunction description System ConfigurationPage Page ON/OFF Port ConfigurationPort Configuration Vlan Mode ConfigurationSelect Vlan Mode VID Vlan Group ConfigurationAdd or Remove Vlan Member Page Aggregation 10 Aggregation/Trunking ConfigurationLacp 11 Lacp Port ConfigurationRstp Rstp Port Configuration Page Page Page Port Mode Port Control Authentication Port Status Radius IP 16 802.1X Configuration 802.1x Parameters Vlan ID Igmp Snooping20 Mirror ports configuration Mirror Configuration21 QoS Configuration QoSQuality of Service ConfigurationQoS Configuration Dscp Setting Dhcp Filter24 Filter Configuration Rate Limit 25 Rate Limit ConfigurationStorm Control 26 Storm Control ConfigurationPage Parameters description Snmp27 Snmp Configuration Statistics Overview Monitoring28 Statistics Overview for all ports Detailed Statistics Page 29 Detailed Statistics for each port 30 Lacp Status Lacp StatusRstp Status 31 Rstp Status Igmp Status 32 Igmp Status Ping Status33 Ping Maintenance 34 Warm Restart Warm RestartFactory Default 36 Software Upgrade Software UpgradeFunction description Configuration File TransferLogout Q&A Resolving No Link ConditionAppendix a Technical Specifications ƒ Cable and Maximum Length ƒ Network InterfaceSFP ƒ MAC Address and Self-learning 8K MAC addressDimensions ƒ Diagnostic LEDƒ Power Requirement Ambient TemperatureManagement Software Specifications OBJECT-TYPE PRIVATE-GESM-SW24L-MIB Definitions = Begin ImportsFrom RFC1213-MIB From RFC1155-SMI