Stickiness And Round-Robin; Stickiness And Connection Rate - D-Link NetDefend DFL-210 User Manual

10.4.5. Server Health Monitoring
Chapter 10. Traffic Management
When the Round Robin algorithm is used, the first arriving requests R1 and R2 from Client 1 are
both assigned to one sever, say Server 1, according to stickiness. The next request R3 from Client 2
is then routed to Server 2. When R4 from Client 3 arrives, Server 1 gets back its turn again and will
be assigned with R4.
Figure 10.10. Stickiness and Round-Robin
If Connection Rate is applied instead, R1 and R2 will be sent to the same server because of
stickiness, but the subsequent requests R3 and R4 will be routed to another server since the number
of new connections on each server within the Window Time span is counted in for the distribution.
Figure 10.11. Stickiness and Connection Rate
Regardless which algorithm is chosen, if a server goes down, traffic will be sent to other servers.
And when the server comes back online, it can automatically be placed back into the server farm
and start getting requests again.
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