Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 144)

134 Brocade Virtual ADX Global Server Load Balancing Guide
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Basic GSLB for IPv6 configuration
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The tcp/udp-port-num parameter specifies a TCP/UDP port number instead of a well-known port. If
the application is not one of those listed above, you still can configure the GSLB Brocade Virtual
ADX to perform the Layer 4 health check on the specified port. If the application number does not
correspond to one of the well-known ports recognized by the Brocade Virtual ADX, the GSLB
Brocade Virtual ADX performs Layer 4 TCP or UDP health checks for the ports but does not perform
application-specific health checks.
NOTE
For other applications (applications not listed above), the Brocade Virtual ADX 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 Brocade
Virtual ADX requests in the health check and the list of HTTP status codes the Brocade Virtual ADX
accepts as valid responses to the health check.
Specifying DNS override IP lists
Once you enable DNS override, you must configure a set of IP addresses (an IP list) for each
domain name (zone and host) configured on the GSLB Brocade Virtual ADX (GSLB controller).
You can specify as many IP addresses as you need for a given domain. When you specify multiple IP
addresses, the GSLB Brocade Virtual ADX uses the applicable GSLB policy metrics to select the
best address from the list of addresses you configure. For information about the metrics, refer to
“Configuring GSLB policy metrics for IPv6” on page 140.
Although DNS override is a global parameter. DNS override IP lists are associated with a specific
host in a specific domain. To configure the proxy server information on the GSLB Brocade Virtual
ADX, enter commands such as the following:
Virtual ADX(config)#gslb dns zone brocade.com
Virtual ADX(config-gslb-dns-brocade.com)#host-info www http
Virtual ADX(config-gslb-dns-brocade.com)#host-info www ip-list 2001:db8::56
The host-info ip-list command configures a list of IP addresses corresponding to host names for
which the GSLB controller acts as the authoritative DNS server (ADNS). In the example, a single
proxy server IPv6 address is specified for the zone called “brocade.com”.
Syntax: [no] host-info host-name ip-list ipv6-address
The host-name parameter specifies the host name.
The ip-list ipv6-address variable specifIes the proxy IPv6 address(es). You can specify as many
proxy IP addresses as you need. If you specify multiple addresses, separate each address with a
space. Here is an example:
host-info www ip-list 2001:db8::56 2001:db8::ab 2001:db8::cd