Weighted site metric – Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) User Manual
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Brocade Virtual ADX Global Server Load Balancing Guide
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Advanced GSLB configuration for IPv6
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Weighted site metric
You can configure the Brocade Virtual ADX to distribute SLB traffic among GSLB sites based on
weights configured for the sites. The weights determine the percentage of traffic each site will
receive in comparison with other sites, which may or may not have weights.
NOTE
You cannot use the weighted site metric if the weighted IP metric is enabled. You assign weights to
GSLB sites. Each GSLB site may consist of one or more ADX devices, but the weight is applicable to
the site as a whole.
The GSLB Brocade Virtual ADX uses relative percentages in order to achieve 100% total weight
distribution.
You can configure the Brocade Virtual ADX to distribute SLB traffic among GSLB sites based on
weights configured for the sites. The weights determine the percentage of traffic each site will
receive in comparison with other sites, which may or may not have weights.
The GSLB Brocade Virtual ADX uses relative percentages in order to achieve 100% total weight
distribution, as shown in Table 19 and Table 20. In Table 19, the total of the Configured weighted
site metrics (second column) is 100. The last column shows that the GSLB Brocade Virtual ADX
distributes the traffic to the IP addresses exactly as configured. In this example, traffic distribution
is straightforward because the total weight of all three GSLB sites equals 100.
Now consider the example in Table 20. In this example, the total of the configured weighted site
metrics (second column) does not equal 100. However, as illustrated in the last column, the GSLB
Brocade Virtual ADX uses relative percentages in order to achieve 100% total weight distribution.
By default, the weighted site metric is disabled. When enabled, it is placed second in the GSLB
algorithm, after the server (host) health metric. You can change the metric order and enable or
disable other metrics, although we do not recommend this. For more information, refer to
“Changing the order of GSLB for IPv6 policy metrics”
TABLE 15
Example weighted site metric configuration
IP address
Configured Weighted Site metric
Relative Weighted Site metric
San Jose
15
33% (15/45 * 100)
New York
20
44% (20/45 * 100)
London
10
22% (10/45 * 100)
Total
45
100%