Re: [mpls] [mpls-tp] Last Call: draft-ietf-mpls-tp-data-plane (MPLS Transport Profile Data Plane Architecture) to Proposed Standard

[John E Drake <[e-mail]>]

Loa,

I'm sorry, that's right.  There is only one label stack entry per stack in which the 'S' bit is set.

Thanks,

John

> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] On Behalf
> Of Loa Andersson
> Sent: Wednesday, June 02, 2010 5:36 AM
> To: [e-mail]
> Cc: [e-mail]; IETF-Announce; [e-mail]
> Subject: Re: [mpls-tp] [mpls] Last Call: draft-ietf-mpls-tp-data-plane
> (MPLS Transport Profile Data Plane Architecture) to Proposed Standard
> 
> All,
> 
> a label stack consists of one or more label stack entries, there is one
> s bit in each of the label stack entries, only one of the s bits are set
> (indicating that this is the bottom of the label stack)
> 
> /Loa
> 
> On 2010-06-02 14:10, Stewart Bryant wrote:
> > Liu
> >
> > As John says, there is only one s bit in a label stack.
> >
> >
> >> > -----Original Message-----
> >> > From: [e-mail] [mailto:[e-mail]] On Behalf
> Of
> >> > [e-mail]
> >> > Sent: Monday, May 31, 2010 11:37 PM
> >> > To: [e-mail]
> >> > Cc: [e-mail]; [e-mail]; IETF-Announce;
> >> [e-mail]
> >> > Subject: Re: [mpls] Last Call: draft-ietf-mpls-tp-data-plane (MPLS
> >> > Transport Profile Data Plane Architecture) to Proposed Standard
> >> >
> >> >
> >> > hi,all editors
> >> > About section 3.2 , there is the following paragraph:
> >> > " If the section is an LSP, this information MAY be implied by
> >> > the LSP label or, if the LSP payload is MPLS-labeled, by the setting
> >> > of the S bit. Additional labels MAY also be used if necessary to
> >> > distinguish different payload types"
> >> > IMO, if the client traffic of section layer is MPLS-labeled, the S
> >> bit of
> >> > section label must be set 1.
> >
> > Please look at Fig 2 of draft-ietf-mpls-tp-framework.
> >
> > The section would add an additional label at the bottom of the stacks
> > shown in the figure.
> >
> > A payload indicator label would be the label below the dashed line, and
> > the LSP and section labels would be below that in the figure.
> >
> > However only one S bit is set in the stack.
> >
> >
> >> > if my understanding is true, maybe violate MPLS-TP framework?
> >> > in my memory,only S bit of the lowest label should be set 1 in MPLS
> >> Label
> >> > stack,
> >> > there can be only one S-bit set in a label stack.
> >> >
> >> > maybe i misunderstand the sentence? I hope it can clarify this
> paragragh
> >> > clearly.
> > I do not think that any further clarification is needed in the dataplane
> > text.
> >
> > - Stewart
> >
> >
> >> >
> >> > best regards
> >> > liu
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > The IESG <[e-mail]>
> >> > 发件人: [e-mail]
> >> >
> >> > 2010-06-01 06:27
> >> > 请答复 给
> >> > [e-mail]
> >> >
> >> > 收件人
> >> > IETF-Announce <[e-mail]>
> >> > 抄送
> >> > [e-mail], [e-mail]
> >> > 主题
> >> > [mpls] Last Call: draft-ietf-mpls-tp-data-plane (MPLS Transport
> >> > Profile Data Plane Architecture) to Proposed Standard
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > The IESG has received a request from the Multiprotocol Label
> >> Switching WG
> >> > (mpls) to consider the following document:
> >> >
> >> > - 'MPLS Transport Profile Data Plane Architecture '
> >> > <draft-ietf-mpls-tp-data-plane-03.txt> as a Proposed Standard
> >> >
> >> > The IESG plans to make a decision in the next few weeks, and solicits
> >> > final comments on this action. Please send substantive comments to
> the
> >> > [e-mail] mailing lists by 2010-06-14. Exceptionally,
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> >> >
> >> > The file can be obtained via
> >> > http://www.ietf.org/internet-drafts/draft-ietf-mpls-tp-data-plane-
> 03.txt
> >> >
> >> > IESG discussion can be tracked via
> >> >
> >>
> https://datatracker.ietf.org/public/pidtracker.cgi?command=view_id&dTag=19
> >> > 671&rfc_flag=0
> >> >
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> Loa Andersson                         email: [e-mail]
> Sr Strategy and Standards Manager            [e-mail]
> Ericsson Inc                          phone: [phone]
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