Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 14)

4 Brocade Virtual ADX Global Server Load Balancing Guide
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Global Server Load Balancing overview
1
• 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
NOTE
To display the list when configuring zone information, enter the host-info host-name ? command,
where host-name is a string specifying a host name.
For other applications (applications not listed above), the ADX device does not perform a Layer 7
heath check but still performs a Layer 3 or Layer 4 TCP or UDP health check.
You can customize the HTTP health check on an individual host basis by changing the URL string
the ADX device requests in the health check and the list of HTTP status codes the ADX device
accepts as valid responses to the health check.
GSLB example
Figure 1 shows an example of a GSLB configuration. In this example, the GSLB Brocade Virtual ADX
(a Brocade Virtual ADX configured for global SLB) is connected to the authoritative DNS server for a
specific domain. (You can configure the Brocade Virtual ADX for more than one domain; this
example uses only one for simplicity.) The authoritative DNS server for brocade.com is known to
other devices as 10.157.23.87. This is a VIP configured on the GSLB Brocade Virtual ADX for the
DNS server.
NOTE
The GSLB controller and sites can be Brocade Virtual ADX or ServerIron ADX devices.