Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 148)

138 Brocade Virtual ADX Global Server Load Balancing Guide
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Basic GSLB for IPv6 configuration
2
In a DNS cache proxy with DNS override configuration, GSLB Brocade Virtual ADX (the GSLB
controller) itself acts as the authoritative DNS server for the configured zones. The gslb policy
command changes the CLI to the GSLB policy configuration level.
DNS override allows the Brocade Virtual ADX to replace the IP address in the DNS reply with
the IP addresses you configure for the DNS cache proxy. These addresses are defined in the IP
list.
Before specifying the IP list, you must define the hosts and their associated health checks (if
applicable). You also must specify the host names and applications that you want to provide
global server load balancing for. For example, assume that brocade.com contains the following
host names and applications: www.brocade.com (HTTP) and ftp.brocade.com (FTP).
3. Specify a zone and host names within that zone.
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
When you configure the GSLB Brocade Virtual ADX, you also specify the zones for which you
want the Brocade Virtual ADX to provide global server load balancing. These are the zones for
which the GSLB controller server is the authority (ADNS).
In this example, the GSLB Brocade Virtual ADX is an authority for www.brocade.com and
ftp.brocade.com. The GSLB Brocade Virtual ADX will provide global server load balancing for
these two.
The application specifies the type of health check the GSLB Brocade Virtual ADX applies to IP
addresses for the host. A host name can be associated with more than one application. In this
case, the GSLB Brocade Virtual ADX considers a host name’s IP address to be healthy only if
the address passes all the health checks.
4. Specify the IP list.
Virtual ADX(config)#gslb policy
Virtual ADX(config-gslb-policy)#host-info www ip-list 2001:db8::56 2001:db8:ab
You can specify as many domain IP addresses as you need for a given domain. When you
specify multiple domain addresses, the GSLB Brocade Virtual ADX uses the applicable GSLB
policy metrics to select the best address from the list of addresses you configure and places
that address at the top of the DNS reply.
NOTE
Domain IP addresses configured under a domain should be valid and non-zero for both IPv4
and IPv6.
5. Specify sites and the site ADX device within the sites on the GSLB Brocade Virtual ADX:
Virtual ADX(config)#gslb site US
Virtual ADX(config-gslb-site-US)#si-name slb-1 10.157.22.206
Virtual ADX(config)#gslb site EU
Virtual ADX(config-gslb-site-EU)#si-name slb-1 10.108.22.114
Configuration on site ADX devices
6. Enable the GSLB protocol on each of the Site ADX devices:
Virtual ADX(config)#gslb protocol