ZyXEL Communications ZyWALL USG 100 Series - Chapter 14 Trunks; Overview; What You Can Do in this Chapter

ZyWALL USG 100/200 Series User’s Guide
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CHAPTER 14
Trunks
14.1 Overview
Use trunks for WAN traffic load balancing to increase overall network throughput
and reliability. Load balancing divides traffic loads between multiple interfaces.
This allows you to improve quality of service and maximize bandwidth utilization
for multiple ISP links.
Maybe you have two Internet connections with different bandwidths. You could set
up a trunk that uses spillover or weighted round robin load balancing so time-
sensitive traffic (like video) usually goes through the higher-bandwidth interface.
For other traffic, you might want to use least load first load balancing to even out
the distribution of the traffic load.
Suppose ISP A has better connections to Europe while ISP B has better
connections to Australia. You could use policy routes and trunks to have traffic for
your European branch office primarily use ISP A and traffic for your Australian
branch office primarily use ISP B.
Or maybe one of the ZyWALL's interfaces is connected to an ISP that is also your
Voice over IP (VoIP) service provider. You can use policy routing to send the VoIP
traffic through a trunk with the interface connected to the VoIP service provider
set to active and another interface (connected to another ISP) set to passive. This
way VoIP traffic goes through the interface connected to the VoIP service provider
whenever the interface’s connection is up.
14.1.1 What You Can Do in this Chapter
•Use the Trunk summary screen (Section 14.2 on page 372) to configure link
sticking and view the list of configured trunks and which load balancing
algorithm each trunk uses.
•Use the Trunk Edit screen (Section 14.3 on page 373) to configure which
interfaces belong to each trunk and the load balancing algorithm each trunk
uses.