Segment Routing

Tue May 22 20:48:23 UTC 2018

> in the day's of yore, i know a few folks who built tooling to validate
> and/or detect failure to sync between the IGP and LDP or detect data plane
> black holing behaviors caused by resolution in the RIB w/no complementary
> label allocation (or LDP convergence lagging significantly). implementations
> have come a long way since then.  but yeah, IGP-LDP sync lag has been a
> thing for some folks.

No matter what the protocol, there will be occasional bugs, and we
will continue to develop ad-hoc scripts to detect and workaround those
when possible until such time that software upgrade is practical. None
of these are practical to write ahead of time, as we won't know what
the bug is we're trying to detect.
This is not protocol discussion in itself, but we can make an argument
that if there is bug probability per SLOC, less SLOC is less bugs, and
label signalling in IGP is far simpler than LDP.

-- 
  ++ytti