ZyXEL Communications ZYWALL USG 20W - Page 13

ZyXEL – ZyWALL USG Support Notes
All contents copyright (c) 2010 ZyXEL Communications Corporation.
13
LLF — Least Load First
When choosing LLF as the load balancing algorithm, the USG will calculate each WAN interface’s current outbound traffic utili zation against the interface’s
available bandwidth. Then it will use each interface’s traffic utilization ratio as the index to decide via which WAN interface it will send the next new session.
The interface with the least outbound traffic utilization ratio will be used to send the next new session.
Take the following for example:
Interface
Available
Bandwidth
Current measured
Traffic
Utilization
Ratio
WAN1
1M
600K
0.6
WAN1_ppp
512K
256K
0.5
WAN2
2M
1.6M
0.8
The next outbound new session will be sent over WAN1_ppp.