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Click the Configure icon of the Group you wish to configure on the Network > Failover & LB page. The Edit LB Group dialog displays.
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On the General tab, edit the display name of the Group in the Name field. The name of the default group cannot be changed.
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From the Type drop-down menu, choose the type (or method) of LB; options change depending on the type selected:
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Basic Failover—The four WAN interfaces use rank to determine the order of preemption when the Preempt checkbox has been enabled. Only a higher-ranked interface can preempt an Active WAN interface. This is selected by default.
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Round Robin—This option now allows you to re-order the WAN interfaces for Round Robin selection. The default order is:
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The Round Robin then returns to the Primary WAN to continue the order.
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Spill-over—The bandwidth threshold applies to the Primary WAN. When the threshold is exceeded, new traffic flows are allocated to the Alternates in a Round Robin manner. If the Primary WAN bandwidth goes below the configured threshold, Round Robin stops, and outbound new flows will again be sent out only through the Primary WAN.
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Ratio—A percentages can be set for each WAN in the LB group. To avoid problems associated with configuration errors, ensure that the percentage corresponds correctly to the WAN interface it indicates.
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Depending on what you selected from the Type drop-down menu, one of these options display:
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Preempt and failback to preferred interfaces when possible Select to enable rank to determine the order of preemption. Selected by default. |
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When bandwidth exceeds BandwidthLimit Kbit/s on PrimaryInterface, new flows will go to the alternate group members in Round Robin manner |
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Round Robin, Spill-over, and Ratio |
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5
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Add, delete, and order member interfaces in the Group Members: Select here:/Selected lists. The use of the selected members in the Selected list depends on the Type selected:
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Add members by selecting a displayed interface from the Group Members: column, and then clicking the Add>> button.
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You can order the entries in the Selected column by:
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b
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If you selected Ratio, instead of ordering the entries, you can specify the ratio of bandwidth for each interface. See Configuring Bandwidth as a Ratio .
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a
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Enter a percentage of bandwidth to be assigned to an interface in the percent (%) field. The total bandwidth for all interfaces should add up to 100%. The total percentage of bandwidth allocated is displayed.
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You can modify the ratio by clicking the Modify Ratio button or have the ratios adjusted automatically by clicking the Auto Adjust button.
Delete members from the Selected: column by:
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b
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Clicking the <<Remove button.
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Final Back-Up—An entry in this setting is an interface of “last resort,” that is, an interface that is used only when all other interfaces in the Selected: group are either unavailable or unusable. To specify a Final Back-Up interface, select an entry in the Group Members list, and then click the double right arrow
 button. To remove a Final Back-Up interface, click the double left arrow  button. |
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Click OK.
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If Ratio is selected, the Add >> button is replaced by a percent (%) field and a Double Right Arrow button, and the Up/Down Arrow buttons are replaced with the Auto Adjust button.
If multiple interfaces are selected, you can either:
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Click the Auto Adjust button to distribute the bandwidth equally among the interfaces.
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Select the interface in the Selected column.
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Click the Modify Ratio button.
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Click the Modify Ratio button again. The percentage for the bandwidth and the total bandwidth allocated are updated.
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1
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Click the Configure icon of the Group you wish to configure on the Network > Failover & LB page. the Edit LB Group dialog displays.
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Click the Probing tab.
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Check Interface every: n sec —The interval of health checks in units of seconds. The default value is 5 seconds.
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Deactivate Interface after: n missed intervals—The number of failed health checks after which the interface sets to Failover. The default value is 6 seconds.
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Reactivate Interface after: n successful intervals—The number of successful health checks after which the interface sets to Available. The default value is 3 seconds.
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Probe responder.global.sonicwall.com on all interfaces in this group—Enable this checkbox to automatically set Logical/Probe Monitoring on all interfaces in the Group. When enabled, TCP probe packets are sent to the global SNWL host that responds to SNWL TCP packets, responder.global.sonicwall.com, using a target probe destination address of 204.212.170.23:50000. When this checkbox is selected, the rest of the probe configuration enables built-in settings automatically. The same probe will be applied to all four WAN Ethernet interfaces.
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4
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Click OK.
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button.