Cabletron Systems SSIM-R8-02 Specifications Page 282

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Load Balancing
262 Enterasys Xpedition User Reference Manual
The network shown above can be created with the following load-balance commands:
If no application verification options are specified, the XP will do a simple TCP handshake
to check that the application is up. Some applications require specific commands for
proper closure of the connection. The following command shows an example of how to
send a specific string to close a connection on a server:
Virtual IP Address Ranges
ISPs who provide web hosting services for their clients require a large number of virtual
IP addresses (VIPs). The load-balance create vip-range-name and load-balance add host-
to-vip-range commands were created specifically for this. An ISP can create a range of
VIPs for up to an entire class C network with the load-balance create vip-range-name
command. Once the vip-range is in place, the ISP can then create the corresponding
secondary addresses on their destination servers. Once these addresses have been created,
the ISP can add these servers to the vip-range with the load-balance add host-to-vip-
range command. These two commands combined help ISPs take advantage of web
servers like Apache which serve different web pages based on the destination address in
the http request. The following example illustrates this:.
load-balance create group-name quick-www virtual-ip 207.135.89.16 virtual-port 80 protocol tcp
load-balance create group-name quick-ftp virtual-ip 207.135.89.16 virtual-port 21 protocol tcp
load-balance create group-name quick-smtp virtual-ip 207.135.89.16 virtual-port 25 protocol tcp
load-balance add host-to-group 10.1.1.1 group-name quick-www port 80
load-balance add host-to-group 10.1.1.2 group-name quick-ftp port 21
load-balance add host-to-group 10.1.1.3 group-name quick-smtp port 25
load-balance set group-options quick-smtp acv-quit quit
Router
S1
10.1.1.16 www.computers.com
10.1.1.17 www.dvd.com
10.1.1.18 www.vcr.com
Internet
Web requests:
207.135.89.16 www.computers.com
207.135.89.17 www.dvd.com
207.135.89.18 www.vcr.com
S2
10.1.2.16 www.computers.com
10.1.2.17 www.dvd.com
10.1.2.18 www.vcr.com
...
...
...
10.1.1.50 www.toys.com
10.1.2.50 www.toys.com
207.135.89.50 www.toys.com
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