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Round-trip times
Configuring active RTT parameters
Configuring active RTT query message interval
The active RTT query message interval refers to the time intervals at which the GSLB ServerIron
ADX sends the list of LDNS addresses to the Site ServerIron ADXs. These are the LDNS hosts for
which the Site ServerIron ADXs need to actively gather the RTT.
To configure the active RTT query message interval, enter the following on the GSLB ServerIron
ADX.
GSLB-ServerIronADX# configure terminal
GSLB-ServerIronADX(config)# gslb active-rtt-query-interval 60
Syntax: [no] gslb active-rtt-query-interval <value>
Enter a value between 30-21600 seconds for <value>. The default is 60 seconds.
Specifying how often to report the active RTT
Site ServerIron ADX must report the actively gathered RTT to the GSLB ServerIron ADX periodically.
To specify the interval, enter the following on the Site ServerIron ADX.
SITE-ServerIronADX# configure terminal
SITE-ServerIronADX(config)# gslb active-rtt-to-peer-interval 30
Syntax: [no] gslb active-rtt-to-peer-interval <value>
Enter a number from 5-1800 seconds for <value>. The default is 60 seconds.
Configuring the cache interval for active RTT prefix
A Site ServerIron ADX on which active RTT gathering is enabled maintains an active RTT cache. The
cache contains the LDNS host prefixes and LDNS host IP addresses that the Site ServerIron ADX
received from the GSLB ServerIron ADX. The entries in the active RTT cache are refreshed each
time the GSLB ServerIron ADX sends an active RTT probing request for that LDNS prefix. If they are
not refreshed, the entries are aged out from the active RTT cache after a specified time. This
duration is referred to as the cache interval.
To configure the cache interval for an active RTT prefix on the Site ServerIron ADX, enter the
following command.
SITE-ServerIronADX# configure terminal
SITE-ServerIronADX(config)# gslb agent-active-cache-interval 300
Syntax: [no] gslb agent-active-cache-interval <value>
Enter a value from 120-3600 seconds for <value>. The default is 600 seconds.
NOTE
This command affects only the active RTT cache maintained by the Site ServerIron ADX. It does not
apply to and has no relation to the client prefix cache maintained by the GSLB controller.
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ServerIron ADX Global Server Load Balancing Guide
53-1002437-01
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