Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 150)

140 Brocade Virtual ADX Global Server Load Balancing Guide
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Advanced GSLB configuration for IPv6
2
Configuring GSLB policy metrics for IPv6
The GSLB Brocade Virtual ADX supports global server load balancing of IPv6 addresses in cache
proxy with DNS override mode. In this mode, The GSLB Brocade Virtual ADX evaluates each IP
address in the IP list based on the configured policy metrics and places the best IP address on the
top of the IP list in the response.
Table 14 lists the GSLB policy metrics used to load balance IPv6 addresses. The metrics are listed
in their default order. If the GSLB controller is unable select the best IP address based on a metric,
the candidate IP addresses are passed on to the next step in the GSLB algorithm, where the
process of selecting the best IP address continues.
DNS response parameters
Configuring an active-only policy (optional) page 161
Configuring an best-only policy (optional) page 162
TABLE 14 GSLB policy metrics for IPv6
Metric Default Configuration options
Server (host) health Enabled.
The GSLB Brocade Virtual ADX
performs Layer 4 health checks on
the TCP or UDP port and Layer 7
health checks on the application, if
the application is known to the
Brocade Virtual ADX.
NOTE: If all the sites fail their health
checks, resulting in all the
sites being rejected by the
GSLB Brocade Virtual ADX,
the Brocade Virtual ADX
sends the DNS reply
unchanged to the client.
You can disable this metric.
NOTE: When both the health check
metric and the FlashBack
metric are is disabled, the
Brocade Virtual ADX does
not perform any Layer 4 or
Layer 7 health checks.
Refer to “Server (host) health
metric” on page 144 .
Weighted IP address Disabled.
When enabled, the Brocade Virtual
ADX distributes GSLB traffic among
IP addresses in the IP list based on
weights assigned to the IP
addresses. You can enable this metric and
assign weights to individual IP
addresses. The weight can be a
value from 0 to 100. The default
value is 0.
Refer to
“Weighted IP metric” on
page 145 .
Weighted site metric Disabled.
When the weighted IP metric is
enabled, the weighted site metric is
disabled. The weighted site metric is
an alternative to the weighted IP
metric. They are mutually exclusive.
When enabled, the Brocade Virtual
ADX distributes SLB traffic among
GSLB sites based on weights
configured for the sites. You can disable this metric.
You can enable this metric and
assign weights to individual sites.
The weight can be from 0 to 100.
The default is 0.
Refer to
“Weighted site metric”
on page 147 .
TABLE 13 Advanced GSLB for IPv6 configuration tasks (Continued)
Feature Reference