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.
On Fri, Mar 9, 2012 at 10:33 PM, Fred Baker <fred <at> cisco.com>
On Mar 8, 2012, at 12:02 AM, 杨术 wrote:
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
We would really appreciate any comments and questions about the document.
My first suggestion would be to compare/contrast with