Brocade Communications Systems ServerIron ADX 12.4.00 Manual Manual page 53

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If an IP address has a relative weight of zero, or if it does not have a weight assigned to it, the IP
address is not selected as the best IP address for a client.
If two or more IP addresses have the same relative weight, or if all of the IP addresses have a
relative weight of zero, all of the IP addresses with the same relative weight are passed on to the
next step in the GSLB algorithm, where the process of selecting the best IP address continues.
Configuring weighted IP metrics
To configure weighted IP metrics, complete the following tasks.
1. Enable the weighted IP metric.
2. Assign weights to the IP addresses.
For example, to enable the weighted IP metric, add the zone gslb.com, add the host www within the
gslb.com zone, and assign a weight of 50 to the IP address 1.1.1.80, enter commands such as the
following:
SLB-ServerIronADX(config-gslb-policy)# weighted-ip
SLB-ServerIronADX(config-gslb-policy)# gslb dns zone gslb.com
SLB-ServerIronADX(config-gslb-dns-gslb.com)# host www http
SLB-ServerIronADX(config-gslb-dns-gslb.com)# host www ip-weight 1.1.1.80 50
Syntax: [no] weighted-ip
Syntax: [no] gslb dns zone <name>
For <name>, enter up to 32 characters
Syntax: [no] host-info <host-name> <host-application> | <tcp/udp-portnum>
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.gslb.com, do no enter the entire name. Enter only "www". The rest of the name is
already specified by the gslb dns zone command.
The <host-application> parameter specifies the host application for which you want to create an IP
list. Specify one of the following:
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The <tcp/udp-portnum> parameter specifies a TCP/UDP port number instead of a well-known port.
Syntax: host-info www ip-weight <IP address> <weight>
ServerIron ADX Global Server Load Balancing Guide
53-1002437-01
The number of eligible IP addresses to be evaluated by the weighted IP metric and their
weights
The weight assigned to the IP address
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
imap4: the well-known name for port 143
ldap: the well-known name for port 389
nntp: the well-known name for port 119
pop3: the well-known name for port 110
smtp: the well-known name for port 25
telnet: the well-known name for port 23
Configuring GSLB protocol parameters
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