Load Balancing - D-Link DWC-1000 User Manual

Wireless Controller

DNS l ook up us i ng Opti on S ervers : DNS Lo o ku p o f t h e cu s t o m DNS
Serv ers can b e s p ecified t o ch eck t h e co n n ect iv it y o f t h e p rimary lin k.

Pi ng thes e IP addres s es : Th es e IP's will b e p in g ed at reg u lar in t erv als t o
ch eck t h e co n n ect iv it y o f t h e p rimary lin k.

Retry Interval i s : Th e n u mb er t ells t h e co n t ro ller h o w o ft en it s h o u ld ru n
t h e ab o v e co n fig u red failu re d et ect io n met h o d .

Fai l over after : Th is s et s t h e n u mb er o f ret ries aft er wh ich failo v er is
in it iat ed .

6.3.2 Load Balancing

Th is feat u re allo ws y o u t o u s e mu lt ip le Op t io n lin ks (an d p res u mab ly mu lt ip le
ISP‟s ) s imu lt an eo u s ly . A ft er co n fig u rin g mo re t h an o n e Op t io n p o rt , t h e lo ad
b alan cin g o p t io n is av ailab le t o carry t raffic o v er mo re t h an o n e lin k. Pro t o co l
b in d in g s are u s ed t o s egregate an d assig n s e rvices o v er o n e Op t io n p o rt in o rd er t o
man ag e in t ern et flo w. Th e co n fig u red failu re d et ect io n met h o d is u s ed at reg u lar
in t erv als o n all co n fig u red Op t io n p o rt s wh en in Lo ad Balan cin g mo d e.
DW C-1000 cu rren t ly s u p p o rt s t h ree alg o rit h ms fo r Lo ad Balan cin g :
Round Robi n: Th is alg o rit h m is p art icu larly u s efu l wh en t h e co n n ect io n s p eed o f
o n e Op t io n p o rt g reat ly d iffers fro m an o t h er. In t h is cas e y o u can d efin e p ro t o co l
b in d in g s t o ro u t e lo w-lat en cy s erv ices (s u ch as VOIP) o v er t h e h ig h er -s p eed lin k
an d let lo w-v o lu me b ackg ro u nd t raffic (s u ch as SM TP) g o o v er t h e lo wer s p eed lin k.
Pro t o co l b in d in g is exp lain ed in n ext s ect io n .
S pi l l Over : If Sp ill Ov er met h o d is s elect ed , Op t io n 1act s as a d ed icat ed lin k t ill a
t h res h old is reached. A ft er t h is, Op t io n 2 will b e u s ed fo r n ew co n n ectio ns. Yo u can
co n fig u re s p ill-o v er mo d e b y u s in g fo llo in g o p t io n s :

Load Tol erance : It is t h e p ercen t ag e o f b an d wid t h aft er wh ich t h e co n t ro ller
co n t ro llers t o s eco n d ary Op t io n .

Max B andwi dth: Th is s et s t h e maximu m b an d wid t h t o lerab le b y t h e p rimary
Op t io n .
If t h e lin k b an d wid t h g o es ab o v e t h e lo ad t o leran ce v alu e o f max b an d wid t h , t h e
co n t ro ller will s p ill-o v er t h e n ext co n n ect io n s t o s eco n d ary Op t io n .
176
User Manual