Cabletron Systems SSIM-R8-02 Specifikace stáhnout pdf (Strana 284)

Web Caching

264 Enterasys Xpedition User Reference Manual

The network shown above can be created with the following load-balance commands:

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 XP 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 XP 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 XP’s web caching function.

Configuring Web Caching

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

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.

Creating the Cache Group

You can specify either a range of contiguous IP addresses or a list of up to four IP

addresses to define the servers when the cache group is created. If you specify multiple

servers, load balancing is based on the destination address of the request. If any cache

server fails, traffic is redirected to the other active servers.

Client IP Address Domain Name Virtual IP

Real Server

TCP Port

20.20.10.1 - 20.20.10.254 www.enterasys.com 207.135.89.16 10.1.1.1 80

30.30.10.1 - 30.30.10.254 10.1.1.2 80

load-balance create group-name enterasys-sec virtual-ip 207.135.89.16 protocol tcp persistence-level ssl virtual-port 443

load-balance add host-to-group 10.1.1.1-10.1.1.2 group-name enterasys-sec port 443

load-balance set client-proxy-subnet enterasys-sec subnet 24

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Cabletron Systems SSIM-R8-02 Specifikace Strana 284