ZyXEL Communications ZyWALL USG 2000 Bedienungsanleitung PDF herunterladen (Seite 12)

ZyXEL – ZyWALL USG Support Notes

Scenario 2 — WAN Load Balancing and Customized Usage of WAN Connection for Specific

Traffic

2.1 WAN Load Balancing

As an enterprise network gateway, the USG ZyWALL often has more than one WAN connection to share the company network traffic load. Without WAN load

balancing, a single WAN connection may get too congested, causing the Internet traffic to become slow or even get lost.

USG ZyWALL provides network administrators with flexible ways of implementing WAN load balancing according to their demands. The outbound traffic is

shared among multiple internet connections. Therefore, Internet traffic can get passed through the USG ZyWALL smoothly, improving your service quality and

ensuring the Internet connections get effectively utilized.

2.1.1 Load Balancing Algorithm

WRR — Weighted Round Robin

We can assign different weights to different internet connections according to their bandwidth. The outbound traffic sessions will be sent out among the

multiple WAN connections in turn; sessions will be assigned to different connections according to their proportional weights. Take the following for example:

WAN1 bandwidth: 1 Mbps.

WAN2 bandwidth: 512 Kbps.

Since WAN1 has a bandwidth about twice that of WAN2, we can assign the weights to WAN1 and WAN2 as follows:

WAN1 Weight: 2

WAN2 Weight: 1

The outbound traffic sessions will be assigned to WAN1 and WAN2 according to their proportional weights. E.g., when there’s total outbound traffic of 900K,

600K will be sent out over WAN1 and 300K will be sent out over WAN2.

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