ZyXEL ZyWALL 5 User Guide - Page 177
Configuring Load Balancing, Least Load First
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Chapter 9 WAN Screens Table 35 NETWORK > WAN > General (continued) LABEL DESCRIPTION Allow Trigger Dial Select this option to allow NetBIOS packets to initiate calls. Apply Click Apply to save your changes back to the ZyWALL. Reset Click Reset to begin configuring this screen afresh. 9.2.2 Configuring Load Balancing To configure load balancing on the ZyWALL, click NETWORK > WAN in the navigation panel. The WAN General screen displays by default. Select Active/Active Mode under Operation Mode to enable load balancing on the ZyWALL. The WAN General screen varies depending on what you select in the Load Balancing Algorithm field. 9.2.3 Least Load First The least load first algorithm uses the current (or recent) outbound and/or inbound bandwidth utilization of each WAN interface as the load balancing criteria for making decisions on how how to route traffic. The outbound bandwidth utilization is defined as the measured outbound throughput over the available outbound bandwidth. The inbound bandwidth utilization is defined as the measured inbound throughput over the available inbound bandwidth. The two ratios are indexes used to calculate which WAN interface is less utilized at the time. A new LAN-originated session is distributed to the less utilized WAN interface. Example 1 The following figure depicts an example where both the WAN interfaces on the ZyWALL are connected to the Internet. The configured available outbound bandwidths for WAN 1 and WAN 2 are 512K and 256K respectively. Figure 99 Least Load First Example If the outbound bandwidth utilization is used as the load balancing index and the measured outbound throughput of WAN 1 is 412K and WAN 2 is 198K, the ZyWALL calculates the load balancing index as shown in the table below. ZyWALL 5/35/70 Series User's Guide 177
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