Figure 100 Load Balancing: Least Load First; Table 36 Least Load First: Example 1; Table 37 Least Load First: Example 2 - ZyXEL Communications 5 Series User Manual

Chapter 9 WAN Screens
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.

Table 36 Least Load First: Example 1

INTERFACE
WAN 1
WAN 2
Example 2
This example uses the same network scenario as in
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.

Table 37 Least Load First: Example 2

INTERFACE
WAN 1
WAN 2
To configure Least Load First, select Least Load First in the Load Balancing Algorithm
field.

Figure 100 Load Balancing: Least Load First

178
OUTBOUND
AVAILABLE (A)
512 K
256 K
OUTBOUND
AVAILABLE MEASURED
(OA) (OM)
512 K 412 K
256 K 198 K
LOAD BALANCING INDEX
(M/A)
MEASURED (M)
412 K 0.8
198 K 0.77
Figure 99 on page
INBOUND
AVAILABLE MEASURED
(IA) (IM)
8000 K 1600 K
2000 K 1600 K
ZyWALL 5/35/70 Series User's Guide
177, but uses both the
AVERAGE LOAD
BALANCING INDEX
(OM / OA + IM / IA) / 2
( 0.8 + 0.2) / 2 = 0.5
( 0.77 + 0.8 ) / 2 = 0.79