| 摘要 |
According to the invention, a domain to be published to an enterprise ECDN is associated (either by static configuration or dynamically) with a set of one or more enterprise zones configurable in a hierarchy. When a DNS query arrives for a hostname known to be associated with given content within the control of the ECDN, a DNS server preferably responds in one of three (3) ways; handing back an IP address, e.g., for an ECDN intelligent node that knows how to obtain the requested content from a surrogate or origin server; executing a zone referral to a next (lower) level name server in a zone hierarchy, or CNAMing to another hostname, thereby essentially restarting the lookup procedure. In the latter case, this new CNAME causes the resolution process to start back at the root and resolve a new path, probably along a different path in the hierarchy. At any particular level in the zone hierarchy, preferably there is an associated zone server. That server preferably executes logic that applied the requested hostname against a map, which, using known techniques, may be generated from given (static, dynamic, internally-generated or third party-sources) performance metrics. Thus, a given name query to ECDN-managed content may be serviced in coordination with various sources of distributed network intelligence. As a result, the invention provides for a distributed, dynamic globally load balanced name service. |
