Optimal route selection in a content delivery network

Details Optimal route selection in a content delivery network Optimal route selection in a content delivery network

2007-09-25

2007-09-25

Pham, Chi (Department: 2616)

Multiplex communications

Fault recovery

Bypass an inoperative channel

C370S228000, C370S351000

Reexamination Certificate

active

10087033

ABSTRACT:
A routing mechanism, service or system operable in a distributed networking environment. One preferred environment is a content delivery network (CDN) wherein the present invention provides improved connectivity back to an origin server, especially for HTTP traffic. In a CDN, edge servers are typically organized into regions, with each region comprising a set of content servers that preferably operate in a peer-to-peer manner and share data across a common backbone such as a local area network (LAN). The inventive routing technique enables an edge server operating within a given CDN region to retrieve content (cacheable, non-cacheable and the like) from an origin server more efficiently by selectively routing through the CDN's own nodes, thereby avoiding network congestion and hot spots. The invention enables an edge server to fetch content from an origin server through an intermediate CDN server or, more generally, enables an edge server within a given first region to fetch content from the origin server through an intermediate CDN region. As used herein, this routing through an intermediate server, node or region is sometimes referred to as “tunneling.”

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