Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 220)

208 ServerIron ADX Global Server Load Balancing Guide
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Advanced GSLB configuration for IPv6
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There are no parameters for the least response selection or round robin selection metrics. These
metrics are tie-breakers. Only one of them is enabled at a time and the one that is enabled is
always the last metric in the policy.
Resetting GSLB policy metrics
To reset the order of the GSLB policy metrics to the default (and also re-enable all disabled
metrics), enter the following command.
ServerIronADX(config-gslb-policy)# metric-order default
Syntax: metric-order default
The no metric-order set command also resets the order and re-enables all disabled metrics. This
command is equivalent to the metric-order default command.
To display the GSLB policy after you change it, enter the show gslb policy command. Refer to
“Displaying the user-configured GSLB policy” on page 234.
Disabling or re-enabling individual GSLB policy metrics
You can explicitly disable individual GSLB policy metrics. For example, to disable the health check
and geographic metrics, enter commands such as the following:
ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# no health-check

ServerIronADX(config-gslb-policy)# no geographic
Syntax: [no] health-check | num-session | preference | round-robin | geographic | capacity |
flashback
NOTE
If you explicitly disable both the health check and FlashBack metrics, the GSLB ServerIron ADX does
not perform any health checks on the remote sites.
To enable a metric, enter the command without “no” in front of it. For example, to re-enable both
the metrics disabled in the preceding example, enter the following commands:
ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# health-check

ServerIronADX(config-gslb-policy)# geographic
To enable the administrative preference metric, which is disabled by default, enter the following
commands:
ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# preference
Server (host) health metric
The GSLB ServerIron ADX sends a Layer 3, Layer 4 TCP or UDP health check and Layer 7
application health check to the server to determine the health of the server and the host
application on the server. If the server fails either health check, the GSLB ServerIron ADX
immediately disqualifies the server’s IP address from being the “best” site.