On Mon, September 8, 2008 09:46, Scott Brim wrote:
Also, ASNs are not aggregatable so we can't use them to represent a large number of independently routed networks.
Scott, I'm not sure an Autonomous System would want to be aggregated. By its nature it is capable of having arbitrary connectivity. On the other hand, addresses can be aggregated. An ASN-based address system would support a more efficient form of aggregation than we have today. And routing (including TE) could be supported by attributes, rather than by address/prefix-len. *shrug* Yang, As somebody pointed out already, LISP provides approximately the same sort of mechanism. Though it uses a list of Locators (backbone/core IP addresses) rather than ASNs to identify an Endpoint's site, relying on a lightweight form of tunneling through the core to support endpoint communication. This allows it to preserve both IPv4/v6 and existing global routing protocols (and thus deployed support). The downside is that it requires a more dynamic mapping mechanism than a theoretical ASN-based approach. You can learn more at http://www.lisp4.net/, and discuss it on the lisp-interest@lists.civil-tongue.net mailing list. Cheers, -Benson