The MPLS WG Archive

[Atul Gupta <atulmailgroup@yahoo.com>]

Vishal,

Well sending the Notifications to all upstream nodes
may not help much(If the Idea is not only to remove
the State) because the new PATH request has to come
from Ingress/Initiator.
What if the Notify Message send to the
Ingress/Initiator starts sending the PathTear
downstream and the failure detection point start
tearing the Path State upstream. The two together will
remove the existing PATH and help establishing the new
PATH again quickly.
Although we can use GMPLS over PSC, but the Idea above
is only to modify MPLS for fast convergence, for big
LSP. 


--- Vishal Sharma <v.sharma@ieee.org> wrote:
> Atul,
> 
> It would not be very efficient to use the
> Notification message
> of GMPLS to remove Path/Resv states in MPLS (or
> GMPLS).
> The primary purpose of the Notification message is
> to get error
> information to the point/node responsible for taking
> an action
> (such as a restoration action) in response to that
> error/fault.
> 
> The removal of the states (even when using GMPLS)
> is still handled by normal RSVP processes,
> which remove state systematically (hop-by-hop) [and
> free up resources]
> from all of the intermediate nodes on a LSP.
> 
> To do the same with a Notification message, you'd
> probably have to
> send a series of Notification messages (since it is
> a targeted message)
> one each to every intermediate node on the LSP,
> instructing them to
> remove state!
> 
> -Vishal
> 
> > -----Original Message-----
> > From: owner-mpls@UU.NET
> [mailto:owner-mpls@UU.NET]On Behalf Of Atul
> > Gupta
> > Sent: Wednesday, July 24, 2002 2:59 AM
> > To: mpls@UU.NET
> > Subject: Notification process
> > 
> > 
> > Hi,
> > In GMPLS we use Notification Message to avoid the
> > large propagation delays of the error messages.
> Can we
> > use same message in MPLS so that existing
> Path/Resv
> > States can be removed quikly and resources are
> also
> > preserved.
> > Atul
> > Samsung
> > 
> > =====
> > Atul Gupta
> > Samsung Software
> > 
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Health - Feel better, live better
> > http://health.yahoo.com
> > 
> 


=====
Atul Gupta
Samsung Software

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