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Chapter 8 WAN and 3G Screens
ZyWALL 2WG User’s Guide
174
Since WAN 2 has a smaller load balancing index (meaning that it is less utilized than WAN 1),
the ZyWALL will send the subsequent new session traffic through WAN 2.
8.2.2.3 Example 2
This example uses the same network scenario as in
, but uses both the
outbound and inbound bandwidth utilization in calculating the load balancing index. If the
measured inbound stream throughput for both WAN 1 and WAN 2 is 1600K, the ZyWALL
calculates the average load balancing indices as shown in the table below.
Since WAN 1 has a smaller load balancing index (meaning that it is less utilized than WAN 2),
the ZyWALL will send the next new session traffic through WAN 1.
To configure
Least Load First
, select
Least Load First
in the
Load Balancing Algorithm
field.
Figure 110
Load Balancing: Least Load First
The following table describes the related fields in this screen.
Table 32
Least Load First: Example 1
INTERFACE
OUTBOUND
LOAD BALANCING INDEX
(M/A)
AVAILABLE (A)
MEASURED (M)
WAN 1
512 K
412 K
0.8
WAN 2
256 K
198 K
0.77
Table 33
Least Load First: Example 2
INTERFACE
OUTBOUND
INBOUND
AVERAGE LOAD
BALANCING INDEX
(OM / OA + IM / IA) / 2
AVAILABLE
(OA)
MEASURED
(OM)
AVAILABLE
(IA)
MEASURED
(IM)
WAN 1
512 K
412 K
8000 K
1600 K
( 0.8 + 0.2) / 2 = 0.5
WAN 2
256 K
198 K
2000 K
1600 K
( 0.77 + 0.8 ) / 2 = 0.79
Table 34
Load Balancing: Least Load First
LABEL
DESCRIPTION
Active/Active
Mode
Select
Active/Active Mode
and set the related fields to enable load balancing on
the ZyWALL.
Load Balancing
Algorithm
Set the load balancing method to
Least Load First
.