Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 33)

ServerIron ADX Global Server Load Balancing Guide 21
53-1002437-01
Proxy for DNS server
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Specifying GSLB controller locations
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.
ServerIronADX(config)# gslb default-location asia
ServerIronADX(config)# write memory
Syntax: [no] gslb default-location asia | europe | n-america | s-america | africa
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 ServerIron ADX to provide global SLB. There are no defaults for these
parameters. As soon as you specify the hosts and applications, the GSLB ServerIron ADX queries
the DNS server (the one for which the GSLB ServerIron 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:
ServerIronADX(config)# gslb dns zone-name brocade.com

ServerIronADX(config-gslb-dns-brocade.com)# host-info www http

ServerIronADX(config-gslb-dns-brocade.com)# host-info ftp ftp
This example adds the zone brocade.com and two host names within that zone: www and ftp. The
GSLB ServerIron ADX will provide global SLB for these two hosts within the zone.
Syntax: [no] gslb dns zone-name <name>
The <name> parameter specifies the DNS zone name. If you delete a DNS zone (by entering no
gslb dns zone-name <name>), the zone and all the host names you associated with the zone are
deleted.
Syntax: [no] host-info <host-name> <host-application> | <TCP/UDP-port-num>
The <host-name> parameter specifies the host name. You do not need to enter the entire
(fully-qualified) host name. Enter only the host portion of the name. For example, if the fully
qualified host name is www.brocade.com, do not enter the entire name. Enter only “www”. The rest
of the name is already specified by the gslb dns zone-name command. You can enter a name up to
32 characters long.
The <host-application> parameter specifies the host application for which you want the GSLB
ServerIron ADX to provide global SLB. You can specify one of the following:
• FTP: the well-known name for port 21. (Ports 20 and 21 both are FTP ports but on the
ServerIron ADX, the name “FTP” corresponds to port 21.)
• TFTP: the well-known name for port 69
• HTTP: the well-known name for port 80