ZyXEL Communications 100 Series, 200 Series 11.2The Trunk Summary Screen

Chapter 11 Trunks

Figure 189 Weighted Round Robin Algorithm Example

Spillover

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.

Figure 190 Spillover Algorithm Example

Finding Out More

•See Section 5.4.3 on page 114 for related information on the Trunk screens.

•See Section 11.3 on page 275 for more background information on trunks.

•See Section 6.6 on page 154 for an example of how to configure load balancing.

11.2The 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.

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	ZyWALL USG 100/200 Series User’s Guide