Cabletron Systems SmartSwitch manual Configuring Web Caching

Chapter 15: Web Hosting Configuration Guide

Group Name	Virtual IP	TCP Port	Destination	TCP Port
			Server IP
www.toys.com	207.135.89.50	80	S1: 10.1.1.50	80
			S2: 10.1.2.50

The network shown in the previous example can be created with the following load- balance commands:

load-balance create vip-range-name mywwwrange 207.135.89.16-207.135.89.50 virtual-port 80 protocol tcp

load-balance add host-to-vip-range 10.1.1.16-10.1.1.50 vip-range-name mywwwrange port 80

load-balance add host-to-vip-range 10.1.2.16-10.1.2.50 vip-range-name mywwwrange port 80

Web Caching

Web caching provides a way to store frequently accessed Web objects on a cache of local servers. Each HTTP request is transparently redirected by the SSR to a configured cache server. When a user first accesses a Web object, that object is stored on a cache server. Each subsequent request for the object uses this cached object. Web caching allows multiple users to access Web objects stored on local servers with a much faster response time than accessing the same objects over a WAN connection. This can also result in substantial cost savings by reducing the WAN bandwidth usage.

Note: The SSR itself does not act as cache for web objects. It redirects HTTP requests to local servers on which the web objects are cached. One or more local servers are needed to work as cache servers with the SSR’s web caching function.

Configuring Web Caching

The following are the steps in configuring Web caching on the SSR:

1.Create the cache group (a list of cache servers) to cache Web objects.

2.Specify the hosts whose HTTP requests will be redirected to the cache servers. This step is optional; if you do not explicitly define these hosts, then all HTTP requests are redirected.

3.Apply the caching policy to an outbound interface to redirect HTTP traffic on that interface to the cache servers.

240 SmartSwitch Router User Reference Manual