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Chapter 3: CacheRaQ 4 Administration
Inter-Cache Communication Protocol (ICP)
settings
To access the ICP Settings, click ICP at the top. The Peer Settings table appears;
see Figure 18.
Figure 18. ICP configuration screen
ICP is an Internet protocol used to create cache hierarchies. A cache hierarchy is
a collection of caching proxy servers organized in a logical parent/child and
sibling arrangement so that cache servers closest to Internet gateways (closest to
the backbone transit entry-points) act as parents to cache servers at locations
farther from the backbone. The parent cache server resolves "misses" for its
children. In other words, when a cache requests an object from its parent, and the
parent does not have the object in its cache, the parent fetches the object, caches
it and delivers it to the child. This ensures that the hierarchy achieves the
maximum reduction in bandwidth utilization on the backbone transit links, helps
reduce load on Internet information servers outside the network served by the
hierarchy, and builds a rich cache on the parent cache servers so that the other
child cache servers in the hierarchy obtain better "hit" rates against their parents.
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Cobalt CacheRaQ 4 User Manual
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