Brocade Communications Systems ServerIron ADX 12.4.00 User Manual
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ServerIron ADX Global Server Load Balancing Guide
53-1002437-01
Round-trip times
1
Displaying the RTT information of a client IP address
The GSLB ServerIron ADX maintains a cache of RTT information received from the site ServerIron
ADXs through the GSLB protocol. You can display the RTT information the GSLB ServerIron ADX has
for a client IP address.
To display the RTT information for a particular client, enter a command such as the following:
ServerIronADX# show gslb cache 1.1.1.42
prefix length = 20, prefix = 1.1.0.0, region = N-AM
prefix source = active-rtt-update,
site = cupertino, ServerIronADX = (1.1.1.115), rtt = 20 (x100 usec) *A >D
(OK) backup rtt = 16 (x100 usec) (OK)
site = local, ServerIronADX = (1.1.1.102), rtt = 65535 (x100 usec) *A >D
(FAL) backup rtt = 8 (x100 usec) (OK)
Syntax: show gslb cache
Num passive RTT peers
Number of active RTT GSLB ServerIron ADXs for which this
ServerIron ADX is a Site ServerIron ADX.
Agent active rtt cache interval
The cache interval for a prefix in the Site ServerIron ADX’s active RTT
cache.
Agent active rtt refresh interval
The interval at which the Site ServerIron ADX refreshes the RTT
value for LDNS prefixes in its active RTT cache.
Num valid prefixes in agent active rtt tree
Number of LDNS prefixes in the Site ServerIron ADX active RTT
cache.
Interval to send gathered active rtt to
controller
Interval at which the Site ServerIron ADX reports the actively
gathered RTT to the GSLB controller.
Disable passive RTT gathering on agent
Shows if passive RTT gathering is disabled on the Site ServerIron
ADX.
Num RTT queries in progress
Number of ICMP RTT probes in progress on the Site ServerIron ADX.
Fast age on ICMP RTT probe fail
Shows if a LDNS prefix in the Site ServerIron ADX’s active RTT cache
is aged out immediately if ICMP probes to that LDNS fail. A value of
1 or greater means that the ICMP probes are aged out immediately.
Agent DNS prober
Indicates if DNS prober is enabled or disabled on the Site ServerIron
ADX.
DNS probe port
configured: Indicates the port number configured for sending out
DNS probes
in-use: Indicates the port number being currently used for sending
out DNS probes.
If the configured and in-use values are different, then the DNS
probe port was changed, but the ServerIron ADX has not been
reloaded.
NOTE: DNS probe port command needs a reload to take effect.
Num DNS RTT queries in progress
Number of DNS RTT probes in progress on the Site ServerIron ADX.
Fast age on DNS RTT probe fail
Shows if a LDNS prefix in the Site ServerIron ADX active RTT cache is
aged out immediately when DNS probes to that LDNS fail. A value of
1 or greater means that the DNS probes are aged out immediately.
TABLE 9
Show GSLB active RTT information (Continued)
This field...
Displays...