comment on draft-takacs-ccamp-revertive-ps-01

["PAPADIMITRIOU Dimitri" <Dimitri.Papadimitriou@alcatel-lucent.be>]

comments on this doc:

1. the document should leave outside its scope signaling of the hold-off
timer.

reason: this timer is used for multi-layer recovery while it would be
advisable to have a more detailed understanding about the needs before
extending the protection object

2. segment protection: it should address first RFC4872 and then see how
it could be applied to segment protection because different segments can
have different WTR (i.e. multiple protection object could be included
because race condition can appear when protected segment overlap and a
failure on another segment occurs on another segment while the other is
ready to the reverted).

example:--A---B---C---D--
          |   +   |   +
           -E-+---    +
              +       +
              +++++++++

B-C fails -> recovery segment B-D, then A-B fails 

thanks,      
-d.