Intel 1520 User Manual

Appendix A Caching Solutions and Performance

If the appliance receives a hit message from an ICP peer, then it sends the HTTP 
request to that peer. It might turn out to be an actual miss, because the original 
HTTP request contains header information that is not communicated by the ICP 
query. For example, the hit might not be the requested alternate. If an ICP hit 
turns out to be a miss, the appliance forwards the request to either its HTTP 
parent caches or to the origin server. 

For information on now to enable and configure ICP options using the Manager 
UI, see the ICP section of the Configure: Routing page (see Setting ICP options‚ 
on page 41). For information on how to configure ICP options using the 
command-line interface see Configuring and maintaining ICP peers‚ on page 84. 

NNTP cache hierarchies

Using an Intel NetStructure Cache Appliance as parent to another group of 
appliances can reduce load on a parent news server and take advantage of the 
large number of concurrent connections that server supports.

In Figure 8 above, the parent news server for each of the child appliances is the 
parent appliance. The parent appliance is a child cache to the distant parent news 
server. 

Zurich

London

 Bombay

Paris

Madrid

Oslo