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ServerIron ADX Global Server Load Balancing Guide 155
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Round-trip times
1
This output shows that the prefix 1.1.0.0, prefix length = 20 was created due to an active RTT
update from the Site ServerIron ADX. The primary RTT reported for this prefix by Site ServerIron ADX
1.1.1.115 is 2000 usec, the source is active RTT gathering and the probe method is DNS. The
backup RTT is 1600usec and the method is ICMP probes.
The output of the command has been enhanced to also display the following:
• Prefix Source
• The source of an RTT entry can be active, passive, or unknown
• The method of gathering shows the type of probe used: ICMP, DNS, or not applicable
• The primary and backup RTT values. A value that appears for the backup RTT is of significance
only if the fallback mechanism is configured on the GSLB ServerIron ADX.
• Whether or not the probe was successful.
This field... Displays...
Prefix length The length of the prefix
Prefix source Displays why the prefix entry was created
region Geographic region for the prefix
Site Name of the Site ServerIron ADX
ServerIron ADX IP address of the Site ServerIron ADX
rtt The primary RTT reported for the prefix in usec.
* The source of an RTT entry (denoted by *) for a prefix. Source can be
one of the following:
• A = Active
• P = Passive
• U = Unknown
> The method of gathering the RTT is displayed in the output. The
method can be:
• I = ICMP probe
• D = DNS probe
• N = Not applicable
backup rtt The backup RTT reported for the prefix in usec.
This value is significant only if the fallback mechanism is configured
on the GSLB ServerIron ADX.
( ) Result of the RTT probe:
• OK: RTT probe is successful
• FAL: RTT probe has failed or RTT to the LDNS server is
unavailable