Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 251)

ServerIron ADX Global Server Load Balancing Guide 239
53-1002437-01
Displaying GSLB for IPv6 configurations
2
Use the show gslb dns command to view information about the distribution of traffic after the
configuration of weighted IP metrics.
State The state of the server. The ServerIron ADX determines the state based
on the results of the Layer 7 health checks sent to the server. The
ServerIron ADX sends Layer 7 health checks for each host application
you associate with the zone.
The state can be one of the following:
•
ACTIVE: The server passed the Layer 4 and Layer 7 health checks
and is presumed to be available.
•
DOWN: The server failed a health check. If any of the health checks
are failed, the GSLB ServerIron ADX disqualifies this site from being
the “best” site.
NOTE: If the server has multiple applications, all the applications must
pass the health check.
NOTE: The ServerIron ADX also uses the results of the health check, if
the server passes the check, in the TCP and App columns under
FlashBack Delay, described below.
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
•
AFRICA
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 23 GSLB zone and host application information (Continued)
This field... Displays...