110 ServerIron ADX Global Server Load Balancing Guide
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Enabling DNS request logging
1
In order to globally configure the health status interval to 7 seconds, configure the following on the
GSLB ServerIron ADX.
GSLB-ServerIronADX(config)# gslb policy
GSLB-ServerIronADX(config-gslb-policy)# health-status-interval 7
GSLB-ServerIronADX(config-gslb-policy)# end
The distributed health check ServerIron ADX 1.1.1.108 now starts sending the health check status
information to the GSLB ServerIron ADX every 7 seconds.
In order to change the health status interval for ServerIron ADX 1.1.1.108 to 4 seconds, configure
the following on the ServerIron ADX 1.1.1.108.
SITE-ServerIronADX#conf t
SITE-ServerIronADX(config)#agent-health-report-interval 4
SITE-ServerIronADX(config)#end
ServerIron ADX 1.1.1.108 now starts sending health check status information to GSLB ServerIron
ADX every 4 seconds. Note that this locally configured health status interval overrides the globally
configured health status interval of 7 seconds.
Since the GSLB ServerIron ADX supports the distributed health check feature, the Flashback metric
is disabled by default. Note that since site ServerIron ADX 1.1.1.108 supports the distributed health
check, you should not enable the Flashback metric on the GSLB ServerIron ADX.
Example 2
In this example:
•The GSLB ServerIron ADX supports the distributed health check feature.
•Site ServerIron ADXs 1.1.1.105, ServerIron ADX 1.1.1.106 and ServerIron ADX 1.1.1.107 and
ServerIron ADX 1.1.1.108 all belong to site “sunnyvale”.
•Only ServerIron ADX 1.1.1.105 supports the distributed health check feature. The other
ServerIron ADXs do not support the distributed health check feature.
If most of the Ser verIro n ADXs at a site d o not support the distributed health check feature and only
a few ServerIron ADXs support the distributed health check feature, then the most concise way to
configure this is to disable the distributed health check feature for the entire site and then
individually enable it for the site ServerIron ADXs that support the distributed the health check
feature.
In the above example, configure the following on the GSLB ServerIron ADX.
GSLB-ServerIronADX# conf t
GSLB-ServerIronADX(config)# gslb site sunnyvale
GSLB-ServerIronADX(config-gslb-site-sunnyvale)# no-distributed-health-check
GSLB-ServerIronADX(config-gslb-site-sunnyvale)#si 1.1.1.105
enable-si-dist-health-check
GSLB-ServerIronADX(config-gslb-site-sunnyvale)#e nd
Example 3
In this example:
•The GSLB ServerIron ADX does not support the distributed health check feature.
•Site ServerIron ADXs 1.1.1.105, ServerIron ADX 1.1.1.106 and ServerIron ADX 1.1.1.107 and
ServerIron ADX 1.1.1.108 all belong to site “sunnyvale”.
•All the site ServerIron ADXs support the distributed health check feature.