ZyXEL Communications 3.1 User Manual

Chapter 7 Trunks

ZyWALL (ZLD) CLI Reference Guide

The following example creates a spill-over trunk for Ethernet interfaces ge1 and ge3, which will 
apply to both incoming and outgoing traffic through the trunk.. The 

ZyWALL

 sends traffic 

through ge1 until it hits the limit of 1000 kbps. The 

ZyWALL

 sends anything over 1000 kbps 

through ge3.

You can have the ZyWALL send each local computer’s traffic through a single WAN interface for a 
specified period of time. This is useful when a redirect server forwards a user request for a file and 
informs the file server that a particular WAN IP address is requesting the file. If the user’s 
subsequent sessions came from a different WAN IP address, the file server would deny the request. 
Here is an example.

Link Sticking

LAN user A tries to download a file from server B on the Internet. The ZyWALL uses WAN1 to send 
the request to server B. 

However remote server B is actually a redirect server. So server B sends a file list to LAN user A. 
The file list lets LAN user A’s computer know that the desired file is actually on file server (C). At the 
same time, register server B informs file server C that a computer located at the WAN1’s IP address 
will download a file.

The ZyWALL is using active/active load balancing. So when LAN user A tries to retrieve the file from 
file server C, the request goes out through WAN2.

Router# configure terminal

Router(config)# interface-group spill-example

Router(if-group)# mode trunk

Router(if-group)# algorithm spill-over

Router(if-group)# interface 1 ge1 limit 1000

Router(if-group)# interface 2 ge3 limit 1000

Router(if-group)# loadbalancing-index total

Router(if-group)# exit

Router(config)#