ZyXEL ZyWALL 5 User Guide - Page 179
Weighted Round Robin
View all ZyXEL ZyWALL 5 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 179 highlights
Chapter 9 WAN Screens The following table describes the related fields in this screen. Table 38 Load Balancing: Least Load First LABEL DESCRIPTION Active/Active Mode Select Active/Active Mode and set the related fields to enable load balancing on the ZyWALL. Load Balancing Set the load balancing method to Least Load First. Algorithm WAN Interface to Local Host Mapping Timeout Select this option to have the ZyWALL send all of a local computer's traffic through the same WAN interface for the period of time that you specify (1 to 600 seconds). This is useful when a redirect server forwards a local user's 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. Time Frame You can set the ZyWALL to get the measured bandwidth using the average bandwidth in the specified time interval. Enter the time interval between 10 and 600 seconds. Load Balancing Specify the direction of the traffic utilization you want the ZyWALL to use in Index(es) calculating the load balancing index. Select Outbound Only, Inbound Only or Outbound + Inbound. Interface This field displays the name of the WAN interface (WAN 1 and WAN 2). Available Inbound Bandwidth This field is applicable when you select Outbound + Inbound or Inbound Only in the Load Balancing Index(es) field. Specify the inbound (or downstream) bandwidth (in kilo bites per second) for the interface. This should be the actual downstream bandwidth that your ISP provides. Available Outbound Bandwidth This field is applicable when you select Outbound + Inbound or Outbound Only in the Load Balancing Index(es) field. Specify the outbound (or upstream) bandwidth (in kilo bites per second) for the interface. This should be the actual upstream bandwidth that your ISP provides. 9.2.4 Weighted Round Robin Round Robin routes traffic on a rotating basis and is activated only when a WAN interface has more traffic than the configured available bandwidth. On the ZyWALL with two WAN interfaces, an amount of traffic is sent through the first interface. The second interface is also given an equal amount of traffic, and then the same amount of traffic is sent through the first interface again; and so on. This works in a looping fashion until there is no outgoing traffic. Similar to the Round Robin (RR) algorithm, the Weighted Round Robin (WRR) algorithm sets the ZyWALL to send traffic through each WAN interface in turn. In addition, the WAN interfaces are assigned weights. An interface with a larger weight gets more of the traffic than an interface with a smaller weight. This algorithm is best suited for situations when the bandwidths set for the two WAN interfaces are different. For example, in the figure below, the configured available bandwidth of WAN1 is 1M and WAN2 is 512K. You can set the ZyWALL to distribute the network traffic between the two interfaces by setting the weight of WAN1 and WAN2 to 2 and 1 respectively. The ZyWALL assigns the traffic of two sessions to WAN1 for every one session's traffic assigned to WAN2. ZyWALL 5/35/70 Series User's Guide 179