[Babel-users] Branches obsolete -- please track master

[Juliusz Chroboczek]

Hi,

I've just merged a bunch of stuff into master:

  - branches xroute-nlogn and rfc6126bis are now obsolete;
  - please track master instead.

This means that master now implements the new revision of the protocol,
temporarily known as RFC 6126bis.  Please see

  https://datatracker.ietf.org/meeting/103/materials/slides-103-babel-recent-changes-to-rfc-6126bis-00.pdf

RFC 6126bis is almost compatible with RFC 6126.  Versions of babeld since
1.8.2 and versions of BIRD since 2.0 understand both revisions of the
protocol.  In order to avoid a flag day:

  * upgrade all of your routers to babeld 1.8.3 or later (1.8.2 is buggy)
    or to BIRD 2.0 or later;
  * only then start deploying current master.

If you are not sure whether all of your routers have been upgraded, you
may add the following stanza to your babeld.conf:

    default rfc6126-compatible true

The above is true for ordinary next-hop routing.  It is not true for
source-specific routing, which has changed in an incompatible way.  The
transition model here is "ships in the night" -- version 1.8.4 speaks the
old source-specific protocol and ignores the new one, while current master
speaks the new source-specific protocol and ignores the old one.  Please
get in touch with me if you're using source-specific routing and cannot
afford a flag day.

Happy upgrading,

-- Juliusz
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