Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 43)

Brocade Virtual ADX Global Server Load Balancing Guide 33
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Configuring GSLB protocol parameters
1
NOTE
DNS override is a global parameter but a list of proxy IP addresses are associated with a specific
host in a specific domain. If there are no proxy addresses for a given host, the GSLB Brocade Virtual
ADX sends the DNS reply unaltered. An exception is if you have enabled the active only feature, in
which case the reply contains only the active addresses. Refer to
“Removing IP addresses for sites
that fail a health check” on page 29.
To display the DNS override state, enter the show gslb policy command. The state is shown in the
DNS override field. Refer to
“Displaying the default GSLB policy” on page 115 for more information.
To display information about the IP addresses selected for a specific domain and host, enter the
show gslb dns zone command. Refer to
“Displaying DNS zone and hosts” on page 109.
Changing the GSLB policy metrics
“GSLB policy” on page 6 describes the default policy the GSLB Brocade Virtual ADX uses to
evaluate the IP addresses in the DNS replies from the DNS server for which the Brocade Virtual
ADX is configured as a proxy. You can change the policy by changing or deleting individual metrics.
Table 2 lists the GSLB policy metrics. The metrics are listed in their default order. The metric
described in the first row is the first metric the GSLB Brocade Virtual ADX uses by default, and so
on.
For example, you can change the following:
• Metric processing order: you can change the order in which the metrics are applied.
• Metric state: you can disable or re-enable some metrics.
• Session-table capacity and threshold tolerance: you can modify the values for these metrics.
• FlashBack tolerance: you can modify the value for this metric.
• Connection load parameters: you can adjust the number of data collection intervals and the
relative weights given to the intervals.
NOTE
If the GSLB policy rejects all of the sites, the GSLB Brocade Virtual ADX sends the DNS reply
unchanged to the client.