Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 175)

Brocade Virtual ADX Global Server Load Balancing Guide 165
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Displaying GSLB for IPv6 configurations
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DNS best-only Indicates whether you have configured the Brocade Virtual ADX to remove all IP
addresses except the “best” address from DNS replies. This field can have one
of the following values:
•
DISABLE: The Brocade Virtual ADX does not remove all addresses except
the best one.
•
ENABLE: The Brocade Virtual 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 “Removing all addresses except the best
address” on page 30.
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 Brocade Virtual ADX does not replace the addresses in DNS
replies with an address from a list you configure.
•
ENABLE: The Brocade Virtual 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 132.
Modify DNS response TTL Indicates whether the GSLB Brocade Virtual 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 Brocade Virtual ADX does not modify the TTLs.
•
ENABLE: The Brocade Virtual ADX modifies the TTLs.
DNS TTL Indicates the value (number of seconds) to which the GSLB Brocade Virtual 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 Brocade
Virtual ADX does not change the TTLs, regardless of the value in this
field.
DNS check interval Indicates how frequently the GSLB Brocade Virtual ADX refreshes its zone and
host information with DNS servers.
Remote SI status update period Indicates how frequently the remote Brocade Virtual ADXs send status updates
to the GSLB Brocade Virtual ADX through the GSLB protocol.
Session capacity threshold Specifies how close to its maximum session capacity the site ADX device
(remote ADX device) can be and still be eligible as the best site for the client. If a
site ADX device exceeds the threshold, the site ADX device is ineligible to be the
best site.
Session capacity tolerance Specifies the percentage by which the number of available sessions on the site
ADX device can differ from the number of available sessions on another site
ADX device and still be considered an equally good site. Refer to
“Session
capacity threshold metric” on page 149.
Flashback appl-level delay
tolerance Indicates the percentage of difference that can exist between application level
FlashBack response times for two sites, without the Brocade Virtual ADX
preferring one site over the other based on this metric.
TCP-level delay tolerance Indicates the percentage of difference that can exist between Layer 4
FlashBack response times for two sites, without the Brocade Virtual ADX
preferring one site over the other based on this metric.
TABLE 17 GSLB policy information (Continued)
Field Description