RE: Notify Message Doubt

["manoj juneja" <manojkumarjuneja@hotmail.com>]

Hi Vishal/George,

     What are the possible failure cases in which the notify message should 
be sent ? Can I assume generic failure conditions like 
NO_ROUTE_TO_DESTINATION, ADMISSION_CONTROL_FAILURE etc. during the LSP 
establishment also lead to transmission of notify message (assuming 
notify_request object has been received) ?
OR Is it that failures occuring in the data path (optical layer) can lead to 
trnasmission of notify message ?

Regards,
manoj.


>From: "Vishal Sharma" <v.sharma@ieee.org>
>Reply-To: <v.sharma@ieee.org>
>To: "manoj juneja" <manojkumarjuneja@hotmail.com>, 
><george.young@meriton.com>
>CC: <ccamp@ops.ietf.org>
>Subject: RE: Notify Message Doubt
>Date: Wed, 22 May 2002 11:30:16 -0700
>
>Manoj,
>
>I don't think that inference is correct. The Notify message
>could be used at any time, but one would probably not use it
>as a replacement for Path/Resv Err messages, since the Notify
>would not cause a change in the state of the intermediate nodes,
>where as the Path/Resv Err would.
>
>Furthermore, the Notify is not guaranteed to follow the exact same
>path as that followed by the LSP. (That, in fact, is one of
>the features that would allow it to get to the intended node
>in the event of failure.)
>
>-Vishal
>
> > -----Original Message-----
> > From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org]On
> > Behalf Of manoj juneja
> > Sent: Wednesday, May 22, 2002 10:54 AM
> > To: george.young@meriton.com
> > Cc: ccamp@ops.ietf.org
> > Subject: RE: Notify Message Doubt
> >
> >
> > Hi George,
> >            If this is the only reason then does this mean that Notify
> > Message has a significance only after the primary LSP is established  
>and
> > this message can't be used during the primary LSP estblishment/setup.
> >
> > Regards,
> > manoj.
> >
> > >From: "George Young" <george.young@meriton.com>
> > >To: "manoj juneja" <manojkumarjuneja@hotmail.com>
> > >CC: <ccamp@ops.ietf.org>
> > >Subject: RE: Notify Message Doubt
> > >Date: Wed, 22 May 2002 09:30:32 -0400
> > >
> > >Hello Manoj,
> > >
> > >Path restoration (i.e. switching over to an existing back-up path at 
>the
> > >head and the tail) is one mechanism for quick optical protection.
> > >
> > >I think the RSVP NOTIFY message is a suitable mechanism to trigger path
> > >restoration. Then RSVP messages (e.g. PathTEAR) can be used to take 
>down
> > >the broken path.
> > >
> > >Regards,
> > >George R. Young
> > >Meriton Networks Inc.
> > >3026 Solandt Rd., Ottawa, ON, Canada, K2K 2A5
> > >phone: +1 613-270-9279 Ext 287
> > >fax: +1 613-270-9628
> > >email: george.young@meriton.com
> > >
> > > >-----Original Message-----
> > > >From: manoj juneja [mailto:manojkumarjuneja@hotmail.com]
> > > >Sent: Tuesday, May 21, 2002 6:52 PM
> > > >To: ccamp@ops.ietf.org
> > > >Subject: Notify Message Doubt
> > > >
> > > >
> > > >Hi All,
> > > >        It is mentioned in drft
> > > >draft-ietf-mpls-generalized-rsvp-te-07.txt
> > > >(sec. 4.3) that Notify Message provides a mechanism to inform
> > > >non-adjacent
> > > >nodes of LSP related events.
> > > >
> > > >I think the generation of PathErr or ResvErr at a node will
> > > >also trigger the
> > > >generation of Notify message to the notify address as received
> > > >in Path or
> > > >Resv Message. What will the end node need to do when it
> > > >receives the notify
> > > >message prior to path/resv err ?
> > > >
> > > >What will the advantage of sending Notify message to the end
> > > >node before it
> > > >receives path/resv err ?
> > > >
> > > >Please help me in understanding its advantage/significance in
> > > >the optical
> > > >domain.
> > > >
> > > >Regards,
> > > >manoj.
> > > >
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>


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