Hi, I think you missed several of the points Russ White made, viz, most routers can already be programmed to do this as part of their ECMP support and that this does not require any protocol changes.
Thanks, John From: [email protected] [mailto:[email protected]] On Behalf Of ?? Sent: Friday, March 09, 2012 10:25 AM To: Fred Baker; [email protected] Subject: Re: Review request for "Two Dimensional IP Routing Architecture" Hi, Fred Baker, Thanks for your advices. We have discussed your draft in our group meeting, because your draft is strongly related with two dimensional routing. Your draft illustrates detaiedly that how to devise a new protocol, that can make forwarding decisions based on destination and source addresses. Our draft differs from yours in that: 1. We try to illustrate the huge benefits from deploying two dimensional routing, that makes forwarding decisions based on both destination and source addresses. The network will be more flexible if routers can divert traffic based on source address. Thus, policy routing, traffic engineering, path/link protection, multi-path, multi-homing can be achieved more easily. For example, with two dimensional routing, we can express "deliver traffic from source A towards destination B to router C" explicitly and easily. 2. We focus on the architecture of two dimensional routing. We try to properly divide the whole routing system into several components, and point out how to devise each component to achieve efficiency and consistency. 3. We have designed a new forwarding table structure called FIST, and we are developing it based on a commercial router. With one more address to lookup during routing, we believe that the FIB is a key component considering scalability issues. FIST is different with previous FIB structure in that, 1) it has two TCAMs, one stores destination prefixes, the other stores source prefixes; 2) in SRAM, there is a two dimensional table that stores the next hop information. Such that we can achieve fast lookup speed, and avoid explosion problem in TCAM. Shu Yang On Fri, Mar 9, 2012 at 10:33 PM, Fred Baker <[email protected]<mailto:[email protected]>> wrote: On Mar 8, 2012, at 12:02 AM, 杨术 wrote: Dear all, We are looking for your comments on the new draft "Two Dimensional IP Routing Architecture". This document describes Two Dimensional IP (TwoD-IP) routing, a new Internet routing architecture which makes forwarding decisions based on both source address and destination address. This presents a fundamental extension from the current Internet, which makes forwarding decisions based on the destination address, and provides shortest single-path routing towards destination. Such extension provides rooms to solve fundamental problems of the past and foster great innovations in the future. We present the TwoD-IP routing framework and its two underpinning schemes. The first is a new hardware-based forwarding table structure for TwoD-IP, FIST, which achieves line-speed lookup with acceptable storage space. The second is a policy routing protocol that flexibly diverts traffic. We plan to give a presentation on this in the upcoming IETF83. The draft can be found at http://tools.ietf.org/html/draft-xu-rtgwg-twod-ip-routing-00. We would really appreciate any comments and questions about the document. My first suggestion would be to compare/contrast with http://tools.ietf.org/html/draft-baker-fun-routing-class
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