Network cache systems are used to improve network performance and reduce network traffic. An improved network cache system that uses a centralized shared cache system is disclosed. Each cache device that shares the centralized shared cache system maintains its own catalog, database or metadata index of the content stored on the centralized shared cache system. When one of the cache devices that shares the centralized shared cache system stores a new content resource to the centralized shared cache system, that cache device transmits a broadcast message to all of the peer cache devices. The other cache devices that receive the broadcast message will then update their own local catalog, database or metadata index of the centralized share cache system with the information about the new content resource.