User guide

17-4 E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
S
ERVER
L
OAD
B
ALANCING
(SLB)
Once you know which virtual server options are useful in your network, you can:
• Define standard virtual servers.
• Define wildcard virtual servers.
U
SING STANDARD OR WILDCARD VIRTUAL SERVERS
Each virtual server maps to a single pool, which can be a group of content servers,
firewalls, routers, or cache servers.
You can configure two different types of virtual servers:
• Standard virtual servers
A standard virtual server represents a site, such as a web site or an FTP site, and it
provides load balancing for content servers. The virtual server IP address should be
the same IP address that you register with the DNS for the site that the virtual server
represents.
• Wildcard virtual servers
A wildcard virtual server load balances transparent network devices such as
firewalls, routers, or cache servers. Wildcard virtual servers use a special wildcard IP
address (0.0.0.0), and you can use them only if you have activated Transparent
mode.
A virtual server is identified by a virtual IP address. To create a virtual server, use the
following command:
create slb vip <vipname> pool <poolname> mode [transparent |
translation | port-translation] <ipaddress>
{-<upper_ipaddress>}:{<L4Port>}
For cache server applications, use Flow Redirection, described on page 17-38.