ServerIron ADX Global Server Load Balancing Guide 233
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DNS active-only Indicates whether the GSLB ServerIron ADX removes IP addresses from the DNS
response if those addresses fail a health check. This field can have one of the
following value s:
•DISABLE: The ServerIron ADX does not remove the IP addresses from the
DNS response.
•ENABLE: The ServerIron ADX removes IP addresses that fail a health check
from the DNS response.
DNS best-only Indicates whether you have configured the ServerIron ADX to remove all IP
addresses except the “best” address from DNS replies. This field can have one
of the following values:
•DISABLE: The ServerIron ADX does not remove all addresses except the
best one.
•ENABLE: The ServerIron ADX removes all addresses except the best one.
NOTE: Even when this feature is enabled, if the GSLB policy does not result in
selection of a best address, the DNS reply can still contain more than
one address.
For more information, refer to “Configuring a best-only policy” on page 230.
DNS override Indicates whether DNS override is enabled. DNS override replaces the
addresses in a DNS reply with the “best” address from a list of addresses you
configure. This field can have one of the following values:
•DISABLE: The ServerIron ADX does not replace the addresses in DNS
replies with an address from a list you configure.
•ENABLE: The ServerIron ADX replaces the addresses in DNS replies with
an address from a list you configure.
For more information about DNS override, refer to “Enabling DNS override” on
page 198.
Modify DNS response TTL Indicates whether the GSLB ServerIron ADX modifies the TTL in the DNS records
in DNS responses before sending the responses to the client’s DNS server. This
field can have one of the following values:
•DISABLE: The ServerIron ADX does not modify the TTLs.
•ENABLE: The ServerIron ADX modifies the TTLs.
DNS TTL Indicates the value (number of seconds) to which the GSLB ServerIron ADX
changes the TTL in each DNS record in the DNS responses before sending them
to the client’s DNS server.
NOTE: If the Modify DNS response TTL field contains “DISABLE”, the ServerIron
ADX does not change the TTLs, regardless of the value in this field.
DNS check interval Indicates how frequently the GSLB ServerIron ADX refreshes its zone and host
information with DNS servers.
Remote ServerIron ADX status
update period
Indicates how freque ntly the rem ote ServerIron ADXs send st atus updates to the
GSLB ServerIron ADX through the GSLB protocol.
Session capacity threshold Specifies how close to its maximum session capacity the site ServerIron ADX
(remote ServerIron ADX) can be and still be eligible as the best site for the
client. If a site ServerIron ADX exceeds the threshold, the site ServerIron ADX is
ineligible to be the best site.
Session capacity tolerance Specifies the percentage by which the number of available sessions on the site
ServerIron ADX can differ from the number of available sessions on another site
ServerIron ADX and still be considered an equally good site.
TABLE 22 GSLB policy information (Continued)
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