Subject: Re: [mpls] MPLS WG Last Call on two related WG documents (PathErrand SoftPreemption)

From: "Newton, Jonathan" <[email-masked]>
Date: Fri, 18 Apr 2008 17:43:02 +0100

Hi MPLS WG,

Would it be possible to have an update on the status of this last call
please?

Cheers,
~Jon.

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On 
> Behalf Of Adrian Farrel
> Sent: 24 February 2008 18:30
> To: [email-masked]
> Cc: [email-masked]; PAPADIMITRIOU Dimitri
> Subject: Re: [mpls] MPLS WG Last Call on two related WG 
> documents (PathErrand SoftPreemption)
> 
> Hi MPLS WG,
> 
> I passed on information about your WG last call on these 
> drafts to CCAMP who probably have an interest in this topic 
> as well. We have received the comments below. Please consider 
> them as part of the last call.
> 
> Thanks,
> Adrian
> ----- Original Message -----
> From: "PAPADIMITRIOU Dimitri" 
> <[email-masked]>
> To: "Adrian Farrel" <[email-masked]>; <[email-masked]>
> Sent: Saturday, February 23, 2008 2:16 PM
> Subject: RE: MPLS WG Last Call on two related WG documents 
> (PathErr and
> SoftPreemption)
> 
> 
> adrian. a base question:
> 
> 2205 defines a mechanism for hard-preemption by tearing down 
> state and a soft-preemption by error msg exchange only (no 
> state modification) --> note that section 2.4 states:
> 
> "A teardown request may be initiated either by an application 
> in an end system (sender or receiver), or by a router as the 
> result of state timeout or service preemption."
> 
> 3209 defines a preemption mechanism with the following conditions:
> - If the requested bandwidth is not available a PathErr 
> message is returned with an Error Code of 01, Admission 
> Control Failure, and an Error Value of 0x0002.
> - If the requested bandwidth is available, but is in use by 
> lower priority sessions, then lower priority sessions 
> (beginning with the lowest priority) MAY be preempted to free 
> the necessary bandwidth. [...] A ResvErr and/or PathErr with 
> the code "Policy Control failure" SHOULD be sent toward the 
> downstream receivers and upstream senders.
> 
> but looking at 2205 these are following the soft-preemption rules.
> 
> -> section 2 in the error doc. is confusing "This text is a
> clarification and re-statement of the procedures set out in 
> [RFC3209] and does not define any new behavior."
> 
> now, with these docs an error msg exchange (fatal) for 
> hard-preemption (that remove states at detecting node and 
> leaves subsequent decision at
> sender) and an error msg exchange (non-fatal) for 
> soft-preemption (that does not remove state at detecting node 
> and leaves subsequent decision at sender)
> 
> -> section 2.3 of the error doc. "Any node clearing either or both the
> Path or the Resv state of a TE LSP MUST also free up the data 
> plane resources allocated to the corresponding TE LSP." is 
> basically confirming the initial 2205 mechanism behind 
> hard-preemption (why keeping upstream state without resource 
> at the detecting node ?).
> 
> thanks,
> -d.
> 
> > -----Original Message-----
> > From: [email-masked]
> > [mailto:[email-masked]] On Behalf Of Adrian Farrel
> > Sent: Saturday, February 23, 2008 12:55 PM
> > To: [email-masked]
> > Subject: Fw: MPLS WG Last Call on two related WG documents (PathErr 
> > and SoftPreemption)
> >
> > Heads up in CCAMP.
> >
> > These I-Ds describe interpretations of RSVP-TE and have 
> implications 
> > for GMPLS.
> >
> > Please review and comment to the MPLS mailing list.
> >
> > Thanks,
> > Adrian
> > ----- Original Message -----
> > From: "Loa Andersson" <[email-masked]>
> > To: <[email-masked]>
> > Cc: "Ross Callon" <[email-masked]>; "David Ward"
> > <[email-masked]>
> > Sent: Monday, February 18, 2008 4:26 PM
> > Subject: [mpls] WG Last Call on two related WG documents 
> (PathErr and
> > SoftPreemption)
> >
> >
> > > Working Group,
> > >
> > > this is to initiate a working group last call on two working group
> > > documents:
> > >
> > > "Node behavior upon originating and receiving Resource 
> ReserVation 
> > > Protocol (RSVP) Path Error message"
> > >
> > > <draft-ietf-mpls-3209-patherr-02.txt>
> > >
> > > and
> > >
> > > "MPLS Traffic Engineering Soft Preemption"
> > >
> > > <draft-ietf-mpls-soft-preemption-10.txt>
> > >
> > > The soft preemption ID became a WG document in Feb 2003. 
> It has been 
> > > "on-hold" for a longer period waiting for another ID defining the 
> > > term "Hard preemption"; the working group considered that
> > that document
> > > was required to progress the soft preemption document. 
> This document 
> > > is the "PathErr-draft" and has now have became a stable 
> WG document.
> > > Therefore it is now possible to start this working group 
> last call.
> > >
> > > Please send your comments to the working group mailing 
> list prior to 
> > > EOB March 3.
> > >
> > > Loa and George
> > >
> > >
> > >
> > >
> > >
> > >
> > > --
> > > Loa Andersson
> > >
> > > Principal Networking Architect
> > > Acreo AB                           phone:  +46 8 632 77 14
> > > Isafjordsgatan 22                  mobile: +46 739 81 21 64
> > > Kista, Sweden                      email:  [email-masked]
> > >                                            [email-masked] 
> > > _______________________________________________
> > > mpls mailing list
> > > [email-masked]
> > > http://www.ietf.org/mailman/listinfo/mpls
> > >
> >
> >
> >
> >
> 
> 
> _______________________________________________
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