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- All: All active monitors must report the available status for the pool to be determined as available.
- Any: Any number of active monitors must report the available status for the pool to be determined as available.
- At least: The minimum number of active monitors that must report the available status for the pool to be determined as available.
4. Click Next and associate a select the preferred load balancing method:
- All Available
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- Ratio: Dynamic (see details below in the procedure)
- Global Availability
- Ratio: Fixed
- Round Robin
- Topology (see details below in the procedure)
For more information, see Load Balancing Methods for DNS Traffic Control.
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5. If you select Ratio: Dynamic as preferred method, also select a dynamic ratio method from the following:
- Round Trip Delay: Select this to enable load balancing based on the proximity of DTC servers determined through round trip delay. Specify the following:
- Monitor: Select a pre-configured health monitor to use for monitoring the round trip delay.
- SNMP: Select this to enable load balancing based on a server metric captured by an SNMP health monitor. Specify the following:
- Monitor: Select a health monitor for which to track a server metric.
- OID: Specify an object identifier that indicates the metric to track.
- Weighing: Select to weigh DTC servers by priority or ratio.
- Inverse OID value: Select this if you want to use the value of the monitored metric as inversed for convenience of determining servers availability.
- Round Trip Delay: Select this to enable load balancing based on the proximity of DTC servers determined through round trip delay. Specify the following:
6. If you select Topology as preferred method, also select a Topology Ruleset. Only topology rulesets with the Server destination type are displayed
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in the drop-down list.
NOTE: If you select Topology as the preferred method, you can also specify the alternate method which is used to select a server from the pool if the preferred one does not return any result. The preferred and alternate methods must be different
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.
7. If applicable, select the alternate load balancing method.
- All Available
- Ratio: Dynamic
- Global Availability
- None
- Ratio: Fixed
- Round Robin
- Topology
For details on each alternate method, see the description of the preferred method above.
8. Click Next to associate servers with the pool. Click the Add icon, select a server from the DTC Server Selector dialog box and click OK. You can use SHIFT+click and CTRL+click to associate multiple servers. The appliance displays the following information:
- ServerName: The name of the DNS Traffic Control server.
- Host: The host address of the server.
- Ratio: You can modify the ratio value. The value must be greater than zero.
- Disabled: Indicates whether the server is disabled.
- Order: Displays the order of servers in the list.
To dissociate a server from the pool, select the check box next to the server name and click the Delete icon.
69. Click Next to define extensible attributes. For information, see Using Extensible Attributes.
710. To schedule the change, click Next or ScheduleforLater. In the ScheduleChange panel, select Now to immediately execute this task. Or select Later to schedule this task, and then specify a date, time, and time zone.
811. Save the configuration.
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