Brocade Communications Systems ServerIron ADX 12.4.00 Manual Manual page 148

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Smoothing mechanism for RTT measurements
Syntax: enable-site-rtt-smoothing
Disabling enhanced RTT smoothing
To disable enhanced RTT smoothing for a GSLB Site, enter commands such as the following:
GSLB-ServerIronADX# configure terminal
GSLB-ServerIronADX(config)# gslb site sanjose
GSLB-ServerIronADX(config-gslb-site-sanjose)# disable-site-rtt-smoothing
Syntax: disable-site-rtt-smoothing
This command disables enhanced RTT smoothing for the specified site. If the feature is enabled
globally, you can disable it for a particular site using this command.
Configuring the parameters
Specifying the maximum RTT deviation
If you want to specify the maximum RTT deviation allowed for a site, enter commands such as the
following on the GSLB ServerIron ADX.
GSLB-ServerIronADX# configure terminal
GSLB-ServerIronADX(config)# gslb site sanjose
GSLB-ServerIronADX(config-gslb-site-sanjose)# max-rtt-dev-allowed 300
Syntax: [no] max-rtt-dev-allowed <percent>
Enter a value from 50-100000 for <percent>. The default is 400 percent.
Specifying the maximum ignore count
The maximum ignore counter defines how many consecutive very high or very low new RTT samples
to ignore before factoring them into the existing RTT value. If you want to specify the
max-ignore-count, enter commands such as the following on the GSLB ServerIron ADX.
GSLB-ServerIronADX# configure terminal
GSLB-ServerIronADX(config)# gslb site sanjose
GSLB-ServerIronADX(config-gslb-site-sanjose)# max-ignore-count 6
Syntax: [no] max-ignore-count <value>
Enter a number from 1-20 for <value>. The default is 3.
Specifying the normal ramp factor
The normal ramp factor defines the factor by which a RTT sample in the acceptable range should
be factored into the existing RTT value. If you want to specify the normal ramp factor, enter
commands such as the following on the GSLB ServerIron ADX.
GSLB-ServerIronADX# configure terminal
GSLB-ServerIronADX(config)# gslb site sanjose
GSLB-ServerIronADX(config-gslb-site-sanjose)# normal-ramp-factor 20
Syntax: [no] normal-ramp-factor <percent>
Enter a value of 1-50 for percent>. The default is 10 percent.
136 ServerIron ADX Global Server Load Balancing Guide
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