Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 45)

Brocade Virtual ADX Global Server Load Balancing Guide 35
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Configuring GSLB protocol parameters
1
After changing policy values, you can display the new values using the show gslb policy command.
If you decide you want to change a value back to its default (using “no” in front of the command you
used to change it), you can display all the default policy values by entering the show gslb default
command. Refer to
“Displaying the default GSLB policy” on page 115.
Available session capacity Enabled.
The default tolerance is 10%.
When comparing sites based on the
session table utilization, the GSLB
Brocade Virtual ADX will prefer one
site over the other only if the
difference in session table
utilization is greater than the
tolerance percentage. You can change the tolerance to a
value from 0 – 100%.
You also can disable this metric.
FlashBack speed (how quickly the
GSLB receives the Layer 4 TCP and
Layer 7 health check results) Disabled.
The default tolerance is 10%. This
applies to the TCP health check and
application health checks.
When comparing sites based on the
FlashBack speed, the GSLB Brocade
Virtual ADX will prefer one site over
the other only if the FlashBack
speeds differ by more than the
specified tolerance. You can change the TCP and
application tolerances individually. A
change applies to all the TCP ports
or applications at the remote site.
You also can disable this metric.
Administrative Preference Disabled.
When enabled, the default
preference is 128. The GSLB
Brocade Virtual ADX will prefer the
site with the highest administrative
preference. If you set the preference
for a site ADX device to 0, the site is
administratively removed from GSLB
selection. You can enable this metric. On an
individual site ADX device basis, you
can change the preference from
128 (the default) to a value from 0 –
255.
Least Response selection (the site
ADX device that has been selected
less often than others) Enabled. Not configurable.
Round Robin Selection Disabled.
When Round Robin Selection is
enabled, Least Response Selection
is disabled. Round Robin Selection
is an alternative to Least Response
Selection. They are mutually
exclusive.
Like Least Response Selection,
Round Robin Selection is a tie
breaker, used only if two or more
sites are equal following comparison
against all other enabled metrics. Not configurable.
TABLE 2 GSLB policy metrics (Continued)
Metric Default Configuration options