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New Member

content delivery service VS. network cache

hi,

Ps clarify what's differences between content delviery service and network cache?

difei

1 REPLY
New Member

Re: content delivery service VS. network cache

Hi,

I gather you are talking about the ACNS software that has both the ecdn and caching application on it? He is an explanation of both applications.

ECDN

The ECDN is an application that pre-positions content at the network edge. This is done using a management GUI. The content is managed from a device called a CDM (Content Delievery Manager). The content is first loaded onto the CDM and then scheduled for distrubution to the edge nodes (CE Content Engines).

When the content is requested, a http request is sent to the CDM and the CDM decides which edge node to send the client to to serve the content. This is done on source IP of the http request. When the CDM works out the closest node the CDM issues a http 302 redirect to the client with the address and a special url to the CE that is closest to the client that has the content.

The CDM is configured with coverage zones for each CE (IP address ranges each CE can serve) and uses this to make a choice to which CE is going to serve the content.

Please see this url for more in-depth information

http://www.cisco.com/univercd/cc/td/doc/product/webscale/uce/acns41/ecdn41/chap1.htm

CACHING

Caching is different in that we do not manage it centrally, we do not pre-position content (althought this can be done with pre-loading), we do not use a central point to determine which cache to use.

Caching is done in one of 2 ways. Transparent or Proxy.

For an explanation of these please see the following URL.

http://www.cisco.com/univercd/cc/td/doc/product/webscale/uce/acns41/cnfg41/index.htm

With caching we take the users request to the internet and proxy it. When the request come back when then cache it (if it is cachable) and send the request back to the client. Depending on if we are running transparent or proxy depends on the protocols that we can proxy/cache.

This url will explain it in more detail.

http://www.cisco.com/univercd/cc/td/doc/product/webscale/uce/acns41/cnfg41/overview.htm

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