Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 30)

20 Brocade Virtual ADX Global Server Load Balancing Guide
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Proxy for DNS server
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NOTE
If the GSLB Brocade Virtual ADX itself is also a site for a host, the configuration steps are the same
as for remote site ADX devices. Add a site definition and then specify the GSLB Brocade Virtual ADX
as the Brocade Virtual ADX at the site. Specify the management IP address as the Brocade Virtual
ADX IP address.
NOTE
If traffic between the GSLB Brocade Virtual ADX and a remote site ADX device must pass through a
firewall, the firewall must be configured to allow traffic to and from the GSLB Brocade Virtual ADX.
Identifying the location
By default, the GSLB Brocade Virtual ADX uses a site’s IP address to determine its geographic
location. Alternatively, you can explicitly identify the location, by entering commands such as the
following.
Virtual ADX(config)#gslb site sunnyvale
Virtual ADX(config-gslb-site-sunnyvale)#geo-location n-america
Syntax: [no] geo-location asia | europe | n-america | s-america
Identifying the GSLB controller location
By default, the GSLB controller is assigned to the North America geographic. Specify the GSLB
controller location by entering the following command at the Global configuration level.
Virtual ADX(config)#gslb default-location asia
Virtual ADX(config)#write memory
Syntax: [no] gslb default-location asia | europe | n-america | s-america
If GSLB default location is not specified and if the requesting client prefix is from an unknown
geography, then the GSLB controller assigns "north-america" as its geography. However, if the
default location is specified, the GSLB controller assigns the configured geography to unknown
client prefixes.
NOTE
This command needs a reload, therefore, issue the write memory command after configuring the
command.
Configuring a zone
You must specify the DNS zone name and the host information (applications) within each zone for
which you want the GSLB Brocade Virtual ADX to provide global SLB. There are no defaults for
these parameters. As soon as you specify the hosts and applications, the GSLB Brocade Virtual
ADX queries the DNS server (the one for which the GSLB Brocade Virtual ADX is a proxy) for the IP
addresses associated with the hosts and begins sending health checks to the hosts.
To configure a zone, enter commands such as the following.
Virtual ADX(config)#gslb dns zone-name brocade.com
Virtual ADX(config-gslb-dns-brocade.com)#host-info www http
Virtual ADX(config-gslb-dns-brocade.com)#host-info ftp ftp