ZyXEL Communications ZyWALL 110 Series, User Manual, Page: 180 / 562

Chapter 8 Trunk
ZyWALL 110/310/1100 Series User’s Guide
180
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.
Figure 103
Spillover Algorithm Example
8.2 The Trunk Summary Screen
Click Configuration > 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.
Figure 104
Configuration > Network > Interface > Trunk