Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 246)

234 ServerIron ADX Global Server Load Balancing Guide
53-1002437-01
Displaying GSLB for IPv6 configurations
2
Displaying the user-configured GSLB policy
Use the show gslb policy command to view user-defined GSLB policy settings for the ServerIron ADX
including the default processing order of the GSLB policy algorithm and the status of many optional
features including the active-only and best-only DNS response parameters.
To display the user-configured GSLB policy, enter the following command.
ServerIronADX(config)# show gslb policy

Default metric order: ENABLE

Metric processing order:

1-Server health check

2-Remote ServerIronADX's session capacity threshold

3-Round trip time between remote ServerIronADX and client

4-Geographic location

5-Remote ServerIronADX's available session capacity

6-Server flashback speed

7-Least response selection


DNS active-only: DISABLE DNS best-only: DISABLE DNS override: DISABLE

Modify DNS response TTL: ENABLE

DNS TTL: 10 (sec), DNS check interval: 30 (sec)

Remote ServerIronADX status update period: 30 (sec)

Session capacity threshold: 90%, session capacity tolerance: 10%

Round trip time tolerance: 10%, round trip time explore percentage: 5%

Round trip time cache prefix: 20, round trip time cache interval: 120 (sec)

Flashback appl-level delay tolerance: 10%, TCP-level delay tolerance: 10%
In this example, the default order of the policy metrics is in effect. Metrics that are disabled by
default (such as the administrative preference) are not listed.
Round trip time tolerance Specifies the percentage by which the RTT for one site can differ from the RTT
for another site without this metric resulting in selection of one site over the
other.
Round trip time explore
percentage Indicates the percentage of client requests from a given network for which the
GSLB ServerIron ADX intentionally ignores the RTT metric when evaluating the
IP addresses in the DNS reply. The explore percentage prevents the ServerIron
ADX from continually biasing its site selection based on the first ServerIron ADX
to return RTT information. Refer to
“Modifying round-trip time values” on
page 53.
Round trip time cache prefix Indicates the length (number of significant bits) of entries in the GSLB
ServerIron ADX’s IP address cache. The prefix determines the extent to which IP
addresses are aggregated into entries in the cache.
Round trip time cache interval Indicates how many seconds the GSLB ServerIron ADX keeps an unrefreshed
RTT cache entry in its cache before the entry ages out.
Flashback appl-level delay
tolerance Indicates the percentage of difference that can exist between application level
FlashBack response times for two sites, without the ServerIron 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 ServerIron ADX preferring
one site over the other based on this metric.
TABLE 22 GSLB policy information (Continued)
This field... Displays...