ZyXEL Communications ZyWALL USG 300 User Manual page 252

Unified security gateway

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Chapter 11 Trunks

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

Table 75 Least Load First Example

Weighted Round Robin

The Weighted Round Robin (WRR) algorithm is best suited for situations when the

bandwidths set for the two WAN interfaces are different. Similar to the Round

Robin (RR) algorithm (see

(WRR) algorithm sets the ZyWALL to send traffic through each WAN interface in

turn. In addition, the WAN interfaces are assigned weights. An interface with a

larger weight gets more of the traffic than an interface with a smaller weight.

For example, in the figure below, the configured available bandwidth of ge2 is 1M

and ge3 is 512K. You can set the ZyWALL to distribute the network traffic between

the two interfaces by setting the weight of ge2 and ge3 to 2 and 1 respectively.

The ZyWALL assigns the traffic of two sessions to ge2 for every session's traffic

assigned to ge3.

Figure 168 Weighted Round Robin Algorithm Example

The spillover load balancing algorithm sends network traffic to the first interface in

the trunk member list until the interface's maximum allowable load is reached,

then sends the excess network traffic of new sessions to the next interface in the

trunk member list. This continues as long as there are more member interfaces

and traffic to be sent through them.

AVAILABLE (A)

MEASURED (M)

Section 11.4 on page

LOAD BALANCING INDEX

256), the Weighted Round Robin

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