Brocade Communications Systems 12.4.00 manual Enabling the Geographic metric, Syntax no geographic

Host-level policies for site selection 1

When the ServerIron ADX compares the Flashback speeds, it compares the Layer 7 (application-level) Flashback speeds first, if applicable. If the application has a Layer 7 health check and if the Flashback speeds are not equal, the ServerIron ADX is through comparing the Flashback speeds. However, if only the Layer 4 health check applies to the application, or if further tie-breaking is needed, the ServerIron ADX then compares the Layer 4 Flashback speeds.

To modify the application (Layer 7) tolerance, TCP (Layer 4) tolerance, or both, enter commands such as the following:

GSLB-ServerIronADX(config)# gslb-host-policy abc GSLB-ServerIronADX(config-gslb-host-policy-abc)# flashback application tolerance 30

GSLB-ServerIronADX(config-gslb-host-policy-abc)# flashback tcp tolerance 50

Syntax: [no] flashback application tcp tolerance <num>

The application tcp parameter specifies whether you are modifying the tolerance for the Layer 4 TCP health check or the Layer 7 application health checks. You can change one or both and the values do not need to be the same. For each, you can specify from 0-100. The default for each is 10.

Enabling the Geographic metric

The geographic metric indicates the geographic location of a site. This metric is enabled by default, which means the GSLB ServerIron ADX uses this metric when evaluating the sites in a DNS reply to choose the best site.

To enable the Geographic metric for a host-level GSLB policy, enter commands such as the following:

GSLB-ServerIronADX(config)# gslb-host-policy abc

GSLB-ServerIronADX(config-gslb-host-policy-abc)# geographic

Syntax: [no] geographic

Use the [no] form of the command to disable the Geographic metric.

Enabling the Health Check metric

To enable the Health Check metric for the host-level GSLB policy, enter commands such as the following:

GSLB-ServerIronADX(config)# gslb-host-policy abc GSLB-ServerIronADX(config-gslb-host-policy-abc)# health-check

Syntax: [no] health-check

Use the [no] form of the command to disable the Health Check metric.

NOTE

When both the Health Check metric and the Flashback metric are disabled for a host-level GSLB policy, the GSLB ServerIron ADX will not perform any Layer 4 or Layer 7 health checks for the hosts/zones for which the policy applies.

Changing the order of the metrics

You can change the order in which the GSLB ServerIron ADX applies the policy metrics for the host-level policy. To change the order, specify the metrics in the desired order, such as the following:

ServerIron ADX Global Server Load Balancing Guide	121
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