Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 108)

98 Brocade Virtual ADX Global Server Load Balancing Guide
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Geographic region for a prefix
1
The GSLB Brocade Virtual ADX determines the geographic location of the client as follows:
• For each client query, the GSLB Brocade Virtual ADX determines the geographic location from
which the client query came based on its IP address. If the IP address prefix of a
user-configured geographic prefix entry matches that of the client, then the geographic
location of the client will be as specified in the user-configured geographic prefix entry.
If multiple server IP addresses compare equally based on the GSLB metrics above the
geographic metric in the GSLB policy, then the GSLB Brocade Virtual ADX prefers server IP
addresses within the same geographic region as the client query.
Configuring a geographic prefix
To configure a geographic prefix, enter commands such as the following.
For IPv4:
GSLB-Virtual ADX#configure terminal
GSLB-Virtual ADX(config)#gslb policy
GSLB-Virtual ADX(config-gslb-policy)#geo-prefix 10.192.0.0/24 europe
GSLB-Virtual ADX(config-gslb-policy)#end
These commands create a geographic prefix entry with IPv4 address 10.192.0.0, prefix length 24,
and geographic region Europe
For IPv6:
GSLB-Virtual ADX#configure terminal
GSLB-Virtual ADX(config)#gslb policy
GSLB-Virtual ADX(config-gslb-policy)#geo-prefix 2001:db8::/64 asia
GSLB-Virtual ADX(config-gslb-policy)#end
These commands create a geographic prefix entry with IPv6 address 2001:db8::, prefix length 64,
and geographic region Asia.
Syntax: geo-prefix { ipv4-addr subnet-mask | Iipv6-addr subnet-mask} [asia | europe | n-america |
s-america]
NOTE
When a geographic prefix is converted from static to dynamic through geographic prefix
configuration, the old geographic prefix information will be replaced with the new information. If the
prefix is deleted, the old value will not be restored because it has already been replaced.