3Com SUPERSTACK 3 WEBCACHE 3000, User Manual

Page: 55 / 362

Parent Caching 55
Figure 14 Parent Caching
5 If the content is not in the parent Webcache, it is retrieved from either the
origin server or another parent Webcache. The content is then cached by
the parent Webcache and simultaneously served to the client machine
and stored in the child Webcache.
Parent Caching
Network Example
The single parent Webcache example in Figure 15 shows a local Branch
Office and a remote central Head Office. All requests for the Internet are
routed through the Head Office site before reaching the World Wide
Web because the Head Office site contains the physical WAN link.
Therefore the Webcache that is deployed between the Branch Office and
Head Office is the child Webcache. All cache misses from that Webcache
are forwarded to the parent Webcache, which is deployed between the
Head Office and the Internet.
Figure 15 Parent Cache Deployment (single parent)
dua1611-5aaa04.book Page 55 Friday, November 29, 2002 8:56 PM