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ZyWALL (ZLD) CLI Reference Guide 93
CHAPTER 7
Trunks
This chapter shows you how to configure trunks on your ZyWALL.
7.1 Trunks Overview
You can group multiple interfaces together into trunks to have multiple connections share the traffic
load to increase overall network throughput and enhance network reliability. If one interface’s
connection goes down, the ZyWALL sends traffic through another member of the trunk. For
example, you can use two interfaces for WAN connections. You can connect one interface to one ISP
(or network) and connect the another to a second ISP (or network). The ZyWALL can balance the
load between multiple connections. If one interface's connection goes down, the ZyWALL can
automatically send its traffic through another interface.
You can use policy routing to specify through which interface to send specific traffic types. You can
use trunks in combination with policy routing. You can also define multiple trunks for the same
physical interfaces. This allows you to send specific traffic types through the interface that works
best for that type of traffic, and if that interface’s connection goes down, the ZyWALL can still send
its traffic through another interface.
7.2 Trunk Scenario Examples
Suppose one of the ZyWALL's interfaces is connected to an ISP that is also your Voice over IP
(VoIP) service provider. You may want to set that interface as active and set another interface
(connected to another ISP) to passive. This way VoIP traffic goes through the interface connected
to the VoIP service provider whenever the interface’s connection is up.
Another example would be if you use multiple ISPs that provide different levels of service to
different places. Suppose ISP A has better connections to Europe while ISP B has better
connections to Australia. You could use policy routing and trunks to send traffic for your European
branch offices primarily through ISP A and traffic for your Australian branch offices primarily
through ISP B.