Example 1; Example 2; Figure 47 Least Load First Example; Table 30 Least Load First: Example 1 - ZyXEL Communications 35 Series User Manual

Internet security appliance

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7.4.1.1 Example 1

The following figure depicts an example where both the WAN ports on the ZyWALL are

connected to the Internet. The configured available outbound bandwidths for WAN 1 and

WAN 2 are 512K and 256K respectively.

If the outbound bandwidth utilization is used as the load balancing index and the measured

outbound throughput of WAN 1 is 412K and WAN 2 is 198K, the ZyWALL calculates the

load balancing index as shown in the table below.

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.

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 102K, 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.

Chapter 7 WAN Screens

AVAILABLE (A)

ZyWALL 5/35/70 Series User's Guide

MEASURED (M)

Figure 47 on page

LOAD BALANCING INDEX

132, but uses both the

AVERAGE LOAD

BALANCING INDEX

(OM / OA + IM / IA) / 2

( 0.8 + 0.4) / 2 = 0.6

( 0.77 + 0.8 ) / 2 = 0.79

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