Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 92)

82 Brocade Virtual ADX Global Server Load Balancing Guide
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Enabling DNS request logging
1
Mandatory configuration is required to disable distributed health check for all ADX devices at site
“sunnyvale” since none of the ADX devices at that site support the distributed health check feature.
Configure the following on the GSLB Brocade Virtual ADX for site “sunnyvale”.
GSLB-Virtual ADX#conf t
GSLB-Virtual ADX(config)#gslb site sunnyvale
GSLB-Virtual ADX(config-gslb-site-sunnyvale)#no-distributed-health-check
GSLB-Virtual ADX(config-gslb-site-sunnyvale)#end
NOTE
You can also achieve the same result by individually disabling distributed health check for each ADX
device at this site i.e. by disabling distributed health check individually for ADX device 10.1.1.105,
ADX device 10.1.1.106 and ADX device 10.1.1.107, but it is simpler and more concise to just disable
it for the whole site.
No mandatory configuration required for ADX device 10.1.1.108 as it supports the distributed
health check feature.
In order to globally configure the health status interval to 7 seconds, configure the following on the
GSLB Brocade Virtual ADX.
GSLB-Virtual ADX(config)#gslb policy
GSLB-Virtual ADX(config-gslb-policy)#health-status-interval 7
GSLB-Virtual ADX(config-gslb-policy)#end
The distributed health check ADX device 10.1.1.108 now starts sending the health check status
information to the GSLB Brocade Virtual ADX every 7 seconds.
In order to change the health status interval for ADX device 10.1.1.108 to 4 seconds, configure the
following on the Brocade Virtual ADX 10.1.1.108.
SITE-Virtual ADX#conf t
SITE-Virtual ADX(config)#agent-health-report-interval 4
SITE-Virtual ADX(config)#end
ADX device 10.1.1.108 now starts sending health check status information to GSLB Brocade
Virtual 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 Brocade Virtual ADX supports the distributed health check feature, the Flashback
metric is disabled by default. Note that since site ADX device 10.1.1.108 supports the distributed
health check, you should not enable the Flashback metric on the GSLB Brocade Virtual ADX.
Example 2
In this example:
• The GSLB Brocade Virtual ADX supports the distributed health check feature.
• Site ADX devices 10.1.1.105, ADX device 10.1.1.106 and ADX device 10.1.1.107 and ADX
device 10.1.1.108 all belong to site “sunnyvale”.
• Only ADX device 10.1.1.105 supports the distributed health check feature. The other ADX
devices do not support the distributed health check feature.
If most of the ADX devices at a site do not support the distributed health check feature and only a
few ADX devices 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 ADX devices that support the distributed the health check feature.