Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 54)

42 ServerIron ADX Global Server Load Balancing Guide
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Configuring GSLB protocol parameters
1
is the IP address for which you are assigning a weight.
is a value from 0 to 100. The default value is 0.
However, this command will result in an error if the IP argument for ip-weight has not been
previously entered as an argument for ip-list. For example, enter the command such as the
following:
SLOWANSI01(config-gslb-dns-myzone.com)#host-info www ip-weight 4.4.4.4 80
This command will respond with the error message: “IP-address not found for host-name”.
NOTE
If there is no 'ip-list' defined for the host, then the 'ip-weight' for the host IPs are removed from the
'gslb dns zone' configuration whenever the GSLB ServerIron ADX or the backend DNS servers are
reloaded.
Displaying the results of traffic distribution for Weighted IPs
To view the results of traffic distribution after configuring weighted IP metrics, enter the following
command.
ServerIronADX# show gslb dns zone


ZONE: gslb1.com

HOST: www:

Flashback DNS resp.

delay selection

(x100us) counters

TCP APP Count (%)

* 10.10.10.200: dns v-ip ACTIVE N-AM 9 19 0 (0%)

* 1.1.1.101: dns v-ip ACTIVE N-AM 0 0 4 (100%)

Syntax: show gslb dns zone
Implementing the weighted site metric
You can configure the ServerIron 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 ServerIron ADXs, but
the weight is applicable to the site as a whole.
The GSLB ServerIron ADX uses relative percentages in order to achieve 100% total weight
distribution, as shown in
Table 5 and Table 6 . In Table 5 , the total of the Configured weighted site
metrics (second column) is 100. The last column shows that the GSLB ServerIron 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.