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are moving to a network architecture that has all the intelligence on the edge, with the core serving only as great big data fire hoses, delivering bulk data from edge to edge. Whereas once the core of the telecommunications network consisted of large, expensive crosspoint switching equipment, with the advent of VLSI (Very Large Scale Integration) technology, switching and routing devices located on the customers premises are increasingly providing the bulk of the packet-switching intelligence. For edge caching to work, a raft of new protocols is required, so that edge proxies can transparently satisfy requests to origin servers and so that cache contents are refreshed appropriately. There is also a need to refresh edge caches from other edge caches, instead of from the origin server, and to pass requests to the nearest, yet least-loaded proxy. The IETF (Internet Engineering Task Force) had a Web Replication and Caching working group (known as WREC), which has now shut down, whose activities were taken up by the Web Intermediaries (known as WEBI) group. There has been a slew of Internet Drafts, many of which have now expired, as well as an attempt to create a taxonomy of Web caching and replication terms and a listing of known problems with Web caching. The attention of the WEBI group is now focused on developing a generic Resource Update Protocol (RUP), whose use cases (usage scenarios) include intra-CDN applications, inter-CDN applications, content provider to CDN, content provider to arbitrary Web intermediary, content location update, content prefetch hinting, content updating, metadata updating, client-driven invalidation, and server-driven invalidation. This work is informed by earlier drafts such as:
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OPES (Open Pluggable Web Services) Aims to allow the plug-in inclusion of code which runs on an edge server (an edge-side include ), analogous to server-side includes, code modules that run on the server, such as CGI (Common Gateway Interface) scripts. ICAP (Internet Content Adaptation Protocol) A protocol to allow edge servers to perform value-added services, such as language translation, compression standards transcoding, virus checking, content filtering, local ad insertion, wireless protocol (WAP) translation, anonymizing, image enhancement, image magnification (for those with sight problems), and batch downloading of Web content. WCCP (Web Cache Coordination/Communication/Control Protocol, depending who you believe) Primarily for redirecting requests away from the origin server and to the edge cache. ICP (Internet Cache Protocol) A UDP-based protocol used for locating instances of cached responses in neighbor caches.
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WPAD (Web Proxy Auto Discovery) A mechanism that enables Web browsers and other clients automatically to locate an appropriate proxy cache within their domains (an alternative to transparent connection hijacking ). NECP (Network Element Control Protocol) A lightweight protocol for signaling between servers and network elements that forward traffic to them, primarily to perform load balancing. EPSF (Extensible Proxy Services Framework) A successor to the NECP and ICAP protocols, which seeks to provide a general-purpose framework for deploying services on edge servers. WCIP (Web Cache Invalidation Protocol) Aims to provide methods to guarantee cache consistency and synchronization with the content on the origin server. IRML (Intermediary Rule Markup Language) An XML-based language used to describe service-specific execution rules on an edge server. CARP (Cache Array Routing Protocol) An alternative to ICP, using hash functions to decide which cache a request is to be forwarded to, in order to maximize hit ratios and minimize the duplication of content among a set of caches. ICCP (Inter Cache Cooperation Protocol) An extension to HTTP and ICP which allows purging of cached objects, tracing of HTTP requests through a sequence of proxies, and the removal of URLs from ICP replies.
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Clearly edge caching is experiencing a torrid period of innovation, as new problems are discovered and solutions proposed. Unfortunately, edge caching is not a universal panacea for streaming quality of service, bandwidth usage, load balancing, and streaming scalability. The colocation of edge servers with POPs requires agreements with companies, who may act to limit the access by one CDN and encourage access by another. Placing the edge server in some other company s premises also carries with it a risk of content theft or unauthorized redistribution. Cache refreshing policies are currently loose, so content may have changed on the origin, yet the end-user is served stale content from the edge. Cache refreshing policy is often left to the cache owner, not the content owner. Edge networks are harder to maintain, because all the equipment is no longer conveniently located in a single network operations center. Content owners are very nervous about leaving their precious media assets on servers located in far flung places, which can be accessed by personnel with whom they have no relation-
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