Zyxel-communications 5 Series Manual do Utilizador descarregar pdf (Página 149)

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ZyWALL 5/35/70 Series User’s Guide

Chapter 8 WAN Screens 149

8.4.1.1 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.

Figure 62 Least Load First Example

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.

8.4.1.2 Example 2

This example uses the same network scenario as in Figure 62 on page 149, 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.

Table 31 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 32 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

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 834 835

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