1. A method of content delivery in a content delivery network (CDN), the CDN deployed, operated and managed by a content delivery network service provider (CDNSP) and comprising a set of content servers and a domain name system (DNS) associated with a CDN namespace, comprising: establishing a plurality of private content delivery networks within portions of the CDN, each private content delivery network associated with a network service provider (NSP) entity distinct from the CDNSP, where the private content delivery network enables the NSP entity to provide content delivery to participating content providers associated with the NSP entity without requiring the NSP entity to deploy, operate and manage content servers; aggregating, into an off-net bandwidth pool, bandwidth that has been made available to the CDNSP; and operating a bandwidth exchange using the bandwidth pool.