The Trunk Summary Screen; Figure 151 Weighted Round Robin Algorithm Example; Figure 152 Spillover Algorithm Example - ZyXEL Communications ZyWALL USG 300 User Manual

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Chapter 11 Trunks

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.

Suppose the first trunk member interface uses an unlimited access Internet connection and the

second is billed by usage. Spillover load balancing only uses the second interface when the

traffic load exceeds the threshold on the first interface. This fully utilizes the bandwidth of the

first interface to reduce Internet usage fees and avoid overloading the interface.

In this example figure, the upper threshold of the first interface is set to 800K. The ZyWALL

sends network traffic of new sessions that exceed this limit to the secondary WAN interface.

Finding Out More

Section 5.4.3 on page 112

Section 11.4 on page 249

Section 6.2 on page 125

11.2 The Trunk Summary Screen

Click Network > Interface > Trunk to open the Trunk screen. This screen lists the

configured trunks and the load balancing algorithm that each is configured to use.

for related information on the Trunk screens.

for more background information on trunks.

for an example of how to configure load balancing.

ZyWALL USG 300 User's Guide