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On Tuesday, there was much whining about single Babel implementation. Luckily 
T.M.S.[1] to the rescue - ~15 hours after start, routes synchronized 
unidirectionally, and after fixing bug or two this morning they go both ways, 
loop-free, etc. So I would argue I have implemented RFC6126 (aka Babel).

Proof (with some github timestamps for amusement from commits): 
https://github.com/fingon/pybabel

Numbers:

mstenber@kosame ~/work/pybabel>ohcount pybabel/*.py babeld.py
Examining 3 file(s)

                          Ohloh Line Count Summary

Language          Files       Code    Comment  Comment %      Blank      Total
----------------  -----  ---------  ---------  ---------  ---------  ---------
python                3        766        112      12.8%         79        957
----------------  -----  ---------  ---------  ---------  ---------  ---------
Total                 3        766        112      12.8%         79        957

(+ some more in unit tests)

8430 byte flash footprint on a router (given Python 3.4 interpreter, + some 
rounding up for blocksize of course)

Caveats:

- I implemented it like ‘zeroconf IS-IS’ works, that is, without useful cost 
function. It fully interoperates with more comprehensive implemenations though.
- Linux only to deal with FIB (system interface for dealing with routes is ‘ip’ 
command from iproute2); core developed on OS X
- IPv6 only (who wants legacy IP?)
- No source routing (I am sure it would maybe add 100 LoC or so)
- officially Python 3.4+ required (likely any Python 3+ variant works, sub-3 
probably would need some work)

Disclaimer:

- if you plan to use this for production use, don’t, unless you test it for 
yourself sufficiently; however, it _does_ work

- pull requests welcome as long as footprint does not increase much

- bucketloads of money to implement more features are welcome too.. *smirk*

Cheers,

-Markus

[1] My personal consulting company; I have been unable to find funding for 
weird hacks, I do not know why.

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