Re: [babel] Restarting nodes and seqno requests

[Juliusz Chroboczek <[e-mail]>]

> No, don't think so, it's just an implementation issue: Bird currently
> won't resend the same request until it expires after two seconds. So
> when the triggered update arrives with S'' (that is still too low), it
> won't ask for another seqno increase. But that is a straight-forward
> fix, and with that it converges reasonably quickly (as long as the seqno
> is not too high I guess...)

Not sure about that -- it will cause extra background traffic, which may
have unintended consequences.  Note that seqnos are 16 bits, so converging
to a feasible seqno takes 16384 packets on average, 32767 worst case.

I'd recommend:

  - add an option for picking a different router-id each time (but
    don't make it the default, since it makes management more difficult
    without stable router-ids);
  - document the issue;
  - bug the BIRD guys about implementing persistent storage; two octets is
    all we're asking for.

Should I document the issue in 6126bis?  I'll definitely add a paragraph
in applicability-statement.

-- Juliusz