D-Link DWC-1000 [142/368] Load balancing

D-Link DWC-1000 User Manual 142

Section 5 - Advanced Network Conguration

Load Balancing

Path:Network>Internet>OptionMode

This feature allows you to use multiple Option links (and presumably multiple ISP’s) simultaneously. After

conguringmorethanoneOptionport,theloadbalancingoptionisavailabletocarrytracovermorethan

onelink.ProtocolbindingsareusedtosegregateandassignservicesoveroneOptionportinordertomanage

internet ow. The congured failure detection method is used at regular intervals on all congured Option ports

when in Load Balancing mode.

This controller currently supports three algorithms for Load Balancing:

Round Robin: This algorithm is particularly useful when the connection speed of one Option port

greatlydiersfromanother.Inthiscaseyoucandeneprotocolbindingstoroutelow-latencyservices

(suchasVOIP)overthehigher-speedlinkandletlow-volumebackgroundtrac(suchasSMTP)goover

thelowerspeedlink.Protocolbindingisexplainedinnextsection.

Spillover: If Spillover method is selected, the primary Option acts as a dedicated link until a dened

bandwidth threshold are reached. After this, the secondary Option will be used for new connections.

Inbound connections on the secondary Option are permitted with this mode, as the spillover logic

governs outbound connections moving from the primary to secondary Option. You can congure

spillover mode by using following options:

• Load Tolerance: It is the percentage of bandwidth after which the controller switches to

secondary Option.

• Max Bandwidth: This sets the maximum bandwidth tolerable by the primary Option for

outboundtrac.

Ifthelinkbandwidthofoutboundtracgoesabovetheloadtolerancevalueofmaxbandwidth,the

controller will spillover the next connections to secondary Option.

Forexample,ifthemaximumbandwidthofprimaryOptionis1Kbpsandtheloadtoleranceissetto70.Now

every time a new connection is established the bandwidth increases. After a certain number of connections say

bandwidthreached70%of1Kbps,thenewoutboundconnectionswillbespilledovertosecondaryOption.The

maximum value of load tolerance is 80% and the minimum is 20%.

LoadbalancingisparticularlyusefulwhentheconnectionspeedofoneOptionportgreatlydiersfromanother.

Inthiscaseyoucandeneprotocolbindingstoroutelow-latencyservices(suchasVOIP)overthehigher-speed

linkandletlow-volumebackgroundtrac(suchasSMTP)gooverthelowerspeedlink.