Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-prefix-attributes-00.txt

Hi Les,

If I understand the P-flag correctly, it is specific to those sub-TLVs which is used for label/index advertisements, rather than to the reachability TLVs. As for how to determine whether a given node is a penultimate hop, it has been well addressed by the routable IP address sub-TLVs as defined in (https://tools.ietf.org/html/draft-xu-isis-routable-ip-address-01). Don't you think so?

Best regards,
Xiaohu

> -----Original Message-----
> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
> Sent: Thursday, October 09, 2014 9:51 PM
> To: Xuxiaohu; isis-wg@ietf.org
> Subject: RE: New Version Notification for
> draft-ginsberg-isis-prefix-attributes-00.txt
> 
> Xiaohu -
> 
> Please read the description of the P-flag in Sections 2.1 and 2.1.1 of
> http://www.ietf.org/id/draft-ietf-isis-segment-routing-extensions-02.txt

>    Les
> 
> 
> > -----Original Message-----
> > From: Xuxiaohu [mailto:xuxiaohu@huawei.com]
> > Sent: Wednesday, October 08, 2014 1:08 AM
> > To: Les Ginsberg (ginsberg); isis-wg@ietf.org
> > Subject: RE: New Version Notification for draft-ginsberg-isis-prefix-
> > attributes-00.txt
> >
> > Hi Les,
> >
> > I have read this draft and felt that the description of the use cases
> > is not much clear. For instance, it said "There are existing use cases
> > in which knowing additional attributes of a prefix is useful.  For
> > example, it is useful to know whether an advertised prefix is directly
> > connected to the advertising router or not.  In the case of [SR]
> > knowing whether a prefix is directly connected or not determines what
> > action should be taken as regards processing of labels associated with
> > an incoming packet..."  Would you please further point to the exact
> > place of the referenced SR draft (draft-
> > ietf-isis-segment-routing-extensions-02) where it said that it's
> > useful to know whether an advertised prefix is directly connected to
> > the advertising router or not. Similarly, it would be better if you
> > could give a more concrete use case where it is useful to know the
> > source of a prefix advertisement when the advertisement has been leaked to
> another level.
> >
> > Best regards,
> > Xiaohu
> >
> >
> >
> > > -----Original Message-----
> > > From: Isis-wg [mailto:isis-wg-bounces@ietf.org] On Behalf Of Les
> > Ginsberg
> > > (ginsberg)
> > > Sent: Tuesday, October 07, 2014 7:46 AM
> > > To: isis-wg@ietf.org
> > > Subject: [Isis-wg] FW: New Version Notification for
> > > draft-ginsberg-isis-prefix-attributes-00.txt
> > >
> > > This draft should be of interest to the WG.
> > >
> > >    Les
> > >
> > >
> > > -----Original Message-----
> > > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > > Sent: Monday, October 06, 2014 4:45 PM
> > > To: Stefano Previdi (sprevidi); Bruno Decraene; Clarence Filsfils;
> > > Les
> > Ginsberg
> > > (ginsberg); Bruno Decraene; Stephane Litkowski; Clarence Filsfils;
> > > Stefano Previdi (sprevidi); Les Ginsberg (ginsberg); Stephane
> > > Litkowski
> > > Subject: New Version Notification for
> > > draft-ginsberg-isis-prefix-attributes-
> > 00.txt
> > >
> > >
> > > A new version of I-D, draft-ginsberg-isis-prefix-attributes-00.txt
> > > has been successfully submitted by Les Ginsberg and posted to the
> > > IETF repository.
> > >
> > > Name:		draft-ginsberg-isis-prefix-attributes
> > > Revision:	00
> > > Title:		IS-IS Prefix Attributes for Extended IP and IPv6 Reachability
> > > Document date:	2014-10-06
> > > Group:		Individual Submission
> > > Pages:		7
> > > URL:
> > > http://www.ietf.org/internet-drafts/draft-ginsberg-isis-prefix-attri
> > > butes-
> > 00.txt
> > > Status:
> > > https://datatracker.ietf.org/doc/draft-ginsberg-isis-prefix-attribut
> > > es/
> > > Htmlized:
> > > http://tools.ietf.org/html/draft-ginsberg-isis-prefix-attributes-00
> > >
> > >
> > > Abstract:
> > >    This document introduces new sub-TLVs to support advertisement of
> > >    prefix attribute flags and the source router id of the router which
> > >    originated a prefix advertisement.
> > >
> > >
> > >
> > >
> > >
> > > Please note that it may take a couple of minutes from the time of
> > submission
> > > until the htmlized version and diff are available at tools.ietf.org.
> > >
> > > The IETF Secretariat
> > >
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