Abstract: A method of propagating multicast subscription and routing information between routers in a network, and constructing forwarding tables in the routers, allowing providers of the data (the publishers), and the multicast recipients of the data (the subscribers) to be decoupled from and have no knowledge of one another. This is done without the need to maintain (Source Network, Published-Multicast-Group) State in the routers, for a highly scalable solution in those applications where there is a possibility for a large, or infinite number of Published-Multicast-Groups, and in those applications where messages are being routed by content, so it is impossible to identify published-multicast-groups.

Abstract: Publishers inject messages containing geospatial data into a content routed network. The subscribers pre-register geospatial data defining an arbitrary geographic region of interest with their subscriptions. The messages are delivered to interested subscribers based on a comparison of the content data and the geospatial data contained in the messages with the corresponding data associated with said pre-registered subscriptions.