Alcatel-Lucent 6850-48 网络指南
Configuring Server Load Balancing
Server Load Balancing Overview
OmniSwitch AOS Release 6 Network Configuration Guide
September 2009
page 44-9
Weighted Round Robin
Distribution Algorithm
In order to distribute traffic among operating servers, the SLB cluster must have a method of selecting a
server among a pool (cluster) of operating servers (i.e., “in service”) depending on some criteria. This
method is commonly called the SLB cluster’s distribution algorithm.
server among a pool (cluster) of operating servers (i.e., “in service”) depending on some criteria. This
method is commonly called the SLB cluster’s distribution algorithm.
The distribution algorithm on an Alcatel-Lucent switch is weighted round robin, where the SLB cluster
distributes traffic according to the relative “weight” a server has within an SLB cluster. In the figure
below, for example, Server A has been assigned by the network administrator a relative weight of 30,
which is the largest weight in the SLB cluster called “WorldWideWeb.” Server A will handle twice as
much traffic as Server C (which has a weight of 15), three times the traffic of Server D (which has a
weight of 10), and six times the traffic of Server B (which has a weight of 5).
distributes traffic according to the relative “weight” a server has within an SLB cluster. In the figure
below, for example, Server A has been assigned by the network administrator a relative weight of 30,
which is the largest weight in the SLB cluster called “WorldWideWeb.” Server A will handle twice as
much traffic as Server C (which has a weight of 15), three times the traffic of Server D (which has a
weight of 10), and six times the traffic of Server B (which has a weight of 5).
Weighted Round Robin Algorithm
Note. See
for information on
modifying the relative weights of servers in an SLB cluster.
OmniSwitch 7800
SLB CLuster “WorldWideWeb”
VIP: 128.241.130.204
Switch
Server A handles twice the traffic of Server C,
three times the traffic of Server D, and six
times the traffic of Server B.
three times the traffic of Server D, and six
times the traffic of Server B.
Server A
IP: 128.241.130.107
Loopback Address:
IP: 128.241.130.107
Loopback Address:
128.241.130.204
Server B
IP: 128.241.130.109
Loopback Address:
IP: 128.241.130.109
Loopback Address:
128.241.130.204
Server C
IP: 128.241.130.115
Loopback Address:
IP: 128.241.130.115
Loopback Address:
128.241.130.204
Server D
IP: 128.241.130.135
Loopback Address:
IP: 128.241.130.135
Loopback Address:
128.241.130.204