RE: TE metric and graceful restart

["Naidu, Venkata" <Venkata.Naidu@Marconi.com>]

-> Why ? And what is in your opinion the correct way to do this ?

  Signal all of Router neighbors that any LSPs should not be 
  accepted even if the link/path constraints are valid.
 
  This can be done in several ways (4 of my suggestions): 

  Using Routing Protocols
  =======================
  (a) Extend another link local opaque LSA (call it Grace-TE-LSA) 
      which will inform Grace period, action, reason etc 
      etc to neighbors.

      And all *helper* nodes should do the needful in
      signaling/CSPF till grace period.
 
      If the nodes are NOT helpful (for so many reasons) 
      then the Grace-TE-LSA will any way not flooded
      beyond neighbors.

  (b) The *Best* way is - just add ACTION TLV in Grace-LSA 
      format defined in draft-ietf-ospf-hitless-restart-02.txt
      That will dictate *all* the actions to take and
      it is easy to extend for future *restart actions*

	ACTION 0 - Unknown
	ACTION 1 - Don't Allow LSPs
	ACTION 2 - Allow LSPs
 	etc etc....

  (c) Keep every thing same (as it is now) AND generate TE-LSA
      with BW 0 and TE metric Infinity using Link Scope Opaque 
      LSA instead of Area Scope Opaque LSA.

  Using signaling protocols
  =========================
  (d) I don't how well we can extend RSVP hellos to do this job?!? 
      But I am sure there must be several ways...(using Hellos etc)

Venkata.