Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt

Hi Aijun,

we have made a similar discussion in the context of the Appendix A of 
draft-ietf-lsr-ospf-prefix-originator. I have made it very clear that 
using IP reachability advertisement to derive any topological data is 
incorrect and broken. Same applies here. I'm not going to change my opinion.

thanks,
Peter

On 30/09/2020 04:38, Aijun Wang wrote:
> Hi, Acee and Peter:
> Passive interface is mainly used at the edge of the network, where the unnumbered interface will not be used.
> And the information to flag the passive interfaces is for positioning the area boundary, not conflict with the abstract capabilities of the area inside.
> 
> 
> Best Regards
> 
> Aijun Wang
> China Telecom
> 
> -----Original Message-----
> From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] On Behalf Of Acee Lindem (acee)
> Sent: Tuesday, September 29, 2020 9:16 PM
> To: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>; Aijun Wang <wangaijun@tsinghua.org.cn>; 'Aijun Wang' <wangaj3@chinatelecom.cn>
> Cc: lsr@ietf.org
> Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt
> 
> Speaking as WG member:
> 
> Hi Aijun, Peter,
> I agree with Peter - one of the main motivations for having areas is to abstract the topology within the area. Now you're trying to supplant this  - one topological detail at a time with ill-conceived IGP features.
> Thanks,
> Acee
> 
> On 9/29/20, 5:15 AM, "Lsr on behalf of Peter Psenak" <lsr-bounces@ietf.org on behalf of ppsenak=40cisco.com@dmarc.ietf.org> wrote:
> 
>      Hi Aijun,
> 
>      On 29/09/2020 11:07, Aijun Wang wrote:
>      > Hi, Peter:
>      >
>      > Thanks for your comments.
>      > 1. For BGP-LS deployment, there normally only be one router that within the
>      > IGP domain to report the topology information, this router should know such
>      > passive links which exists mainly on other border routers via the IGP
>      > protocol. This is main reason to extension the IGP protocol. > 2. For the solution, normally, the link within the IGP connect two
>      ends, but
>      > passive interface is special and not fall in this space. We have studied the
>      > current TLVs that for link, and find no suitable container to append this
>      > information. This is the reason that we select the TLVs that associated with
>      > Prefix.
> 
>      if the link is unnumbered, your solution does not work. As I said, if
>      you need a knowledge about the link, you can not advertise it as a prefix.
> 
>      thanks,
>      Peter
> 
> 
>      >
>      >>From other POV, the OSPFv3 defines now the "Intra-Area-Prefix LSA", which
>      > isolate the prefix information that associated with link into this
>      > container, contains the stub link, local interface information etc. Put such
>      > attribute along with the prefix is then acceptable?
>      >
>      >
>      > Best Regards
>      >
>      > Aijun Wang
>      > China Telecom
>      >
>      > -----Original Message-----
>      > From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] On Behalf Of Peter
>      > Psenak
>      > Sent: Tuesday, September 29, 2020 4:29 PM
>      > To: Aijun Wang <wangaj3@chinatelecom.cn>
>      > Cc: lsr@ietf.org
>      > Subject: Re: [Lsr] FW: New Version Notification for
>      > draft-wang-lsr-passive-interface-attribute-04.txt
>      >
>      > Hi Aijun,
>      >
>      > here's my comments:
>      >
>      > The purpose of this draft is to advertise passive links.
>      >
>      > 1. I'm not sure the problem needs to be solved by IGPs. I tend to believe
>      > ietf-idr-bgpls-inter-as-topology-ext is sufficient.
>      >
>      > 2. the solution that you proposed is wrong. You are trying to derive
>      > topological data about the passive links from the prefix advertisement.
>      > This is semantically incorrect and only works under very specific condition.
>      > If you need to advertise a link, advertise it as a "special"
>      > link, not as a "special" prefix.
>      >
>      > thanks,
>      > Peter
>      >
>      > On 29/09/2020 03:17, Aijun Wang wrote:
>      >> Hi, Peter:
>      >>
>      >> Would you like to review and give comments on the updates version of this
>      > draft?
>      >> We have also added the protocol extension proposal for OSPFv3.
>      >>
>      >> The update version of this draft can refer to
>      >> https://datatracker.ietf.org/doc/html/draft-wang-lsr-passive-interface
>      >> -attribute
>      >> Thanks in advance.
>      >>
>      >>
>      >> Best Regards
>      >>
>      >> Aijun Wang
>      >> China Telecom
>      >>
>      >>> -----Original Message-----
>      >>> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
>      >>> Sent: Monday, September 28, 2020 3:17 PM
>      >>> To: Zhibo Hu <huzhibo@huawei.com>; Gyan Mishra
>      >>> <gyan.s.mishra@verizon.com>; Aijun Wang <wangaj3@chinatelecom.cn>;
>      >>> Gyan S. Mishra <gyan.s.mishra@verizon.com>
>      >>> Subject: New Version Notification for
>      >>> draft-wang-lsr-passive-interface-attribute-04.txt
>      >>>
>      >>>
>      >>> A new version of I-D,
>      >>> draft-wang-lsr-passive-interface-attribute-04.txt
>      >>> has been successfully submitted by Aijun Wang and posted to the IETF
>      >>> repository.
>      >>>
>      >>> Name:		draft-wang-lsr-passive-interface-attribute
>      >>> Revision:	04
>      >>> Title:		Passive Interface Attribute
>      >>> Document date:	2020-09-28
>      >>> Group:		Individual Submission
>      >>> Pages:		7
>      >>> URL:
>      >>> https://www.ietf.org/id/draft-wang-lsr-passive-interface-attribute-04.
>      >>> txt
>      >>> Status:
>      >>> https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-att
>      >>> r
>      >>> ibute/
>      >>> Htmlized:
>      >>> https://datatracker.ietf.org/doc/html/draft-wang-lsr-passive-interfac
>      >>> e
>      >>> -attribut
>      >>> e
>      >>> Htmlized:
>      >>> https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribut
>      >>> e
>      >>> -04
>      >>> Diff:
>      >>> https://www.ietf.org/rfcdiff?url2=draft-wang-lsr-passive-interface-at
>      >>> t
>      >>> ribute-04
>      >>>
>      >>> Abstract:
>      >>>      This document describes the mechanism that can be used to
>      >>>      differentiate the passive interfaces from the normal interfaces
>      >>>      within ISIS or OSPF domain.
>      >>>
>      >>>
>      >>>
>      >>>
>      >>> 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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>      > Lsr@ietf.org
>      > https://www.ietf.org/mailman/listinfo/lsr
>      >
>      >
>      >
> 
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