Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 184)

172 ServerIron ADX Global Server Load Balancing Guide
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Displaying GSLB information
1
Displaying detailed DNS information
You can display all the information displayed by the show gslb dns zone command, plus information
about the site and the ServerIron ADX on which a VIP is configured, by entering the show gslb dns
detail command.
This command is especially useful for sites that are configured for Symmetric Server Load
Balancing. For information about this load balancing feature, see High Availability.
This example assumes that the ServerIron ADXs at the sunnyvale site are each configured with two
VIPs for the “www” host and two VIPs for the “ftp“ host in the brocade.com domain:
• VIPs 209.157.22.100 and 209.157.22.101 are configured on both ServerIron ADXs for the
“www” host.
• VIPs 209.157.22.102 and 209.157.22.103 are configured on both ServerIron ADXs for the
“ftp” host.
The same VIPs are configured on both ServerIron ADXs, but only one of the ServerIron ADXs is
actively load balancing for a particular VIP. The other ServerIron ADX is the standby for that VIP and
assumes load balancing duties for the VIP only if the other ServerIron ADX becomes unavailable.
The default active ServerIron ADX for a particular VIP is determined by the priority you assign to the
VIP when you are configuring Symmetric SLB.
Location The geographic location of the server. The location is based on the IP
address and can be one of the following:
•
ASIA
•
EUROPE
•
N-AM: North America
•
S-AM: South America
The GSLB ServerIron ADX can use this information when comparing the
servers in order to select the “best” ones for the client. The GSLB
ServerIron ADX prefers servers within the client’s geographic region over
servers in other geographic regions.
FlashBack Delay (x100us) The round-trip time for a health check sent by the GSLB ServerIron ADX
to the host application on the server.
The GSLB ServerIron ADX can use this information when comparing the
servers in order to select the “best” ones for the client. The GSLB
ServerIron ADX prefers servers with lower round-trip times to those with
higher round-trip times.
The value in the TCP column indicates the round-trip time of the Layer 4
health check to the TCP port.
The value in the App column indicates the round-trip time for the Layer 7
health check.
NOTE: A single value is displayed even if the zone has multiple host
applications. If the FlashBack values (round-trip times) differ, the
slowest times are displayed.
DNS resp. selection counters Count The number of times the GSLB ServerIron ADX has selected this server
as the “best” server and thus placed the server’s IP address at the top of
the list in DNS replies.
DNS resp. selection percentage (%) The percentage of times the GSLB ServerIron ADX has selected this
server as the “best” server and thus placed the server’s IP address at
the top of the list in DNS replies.
TABLE 11 GSLB zone and host application information (Continued)
This field... Displays...