[e2e] Why was hop by hop flow control eventually abandonded?

Joe Touch touch at isi.edu
Wed Jul 17 13:16:44 PDT 2013

On 7/16/2013 2:24 PM, Bob Braden wrote:
> I believe that hop-by-hop flow control only works with per-flow state in
> the routers (see X.25 for example). Once the decision was made that the
> routers should be stateless, end-to-end flow control was the only
> option. That is what the end-to-end principle is all about.
> Bob Braden

IMO, E2E says that E2E can't replace HBH, but not that HBH can't or 
shouldn't exist.

HBH can be important to optimizing the E2E, so long as it operates over 
the correct relative timescales (HBH being faster than E2E, so you don't 
have the two fighting each other).


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