ServerIron ADX Global Server Load Balancing Guide 171
53-1002437-01
Displaying GSLB information 1
TABLE 11 GSLB zone and host application information
This field... Displays...
ZONE The zone name. The name that appears here is the name you specified
when you configured the zone information.
NOTE: This field appears only if you do not specify the zone name when
you display the information. If you specify the zone name,
information for only that zone is displayed.
HOST The host name. The name that appears here is the name you specified
when you configured the host information.
IP addresses The column of IP addresses lists the IP addresses the authoritative DNS
server associated with the host name in the DNS reply. These are the
servers that contain the content for the host. In this example, the
servers contain the content for www.brocade.
After evaluating the addresses using the GSLB policy, the GSLB
ServerIron ADX marks each address that passes the algorithm with an
asterisk (*). An IP address that does not have an asterisk in front of it
has not passed the GSLB algorithm and cannot be selected as the
“best” site.
NOTE: If DNS override is enabled, only the addresses configured in the
host’s IP list have asterisks and are valid choices for the best
site. Refer to “Enabling DNS override” on page 33.
Source The value following each server IP address indicates how the ServerIron
ADX learned the address. This field can have one of the following values:
•cfg: The address is one that you associated with the host as part of
the DNS override feature. Refer to “Enabling DNS override” on
page 33.
•d/c: The address was learned from the DNS server and also is one
that you associated with the host.
•dns: The address was learned from the DNS server.
In the example above, the ServerIron ADX learned about all the IP
addresses associated with the zone name from the DNS server; thus,
the source is listed as “dns”.
Type The next value indicates the type of address, which can be one of the
following:
•v-ip: The address is a VIP configured on a ServerIron ADX.
•real-ip: The address is a real server.
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.