We discussed the alternatives and went with the unreachable link metric for the 
following reasons:

    1. We already have an unreachable metric using LSInfinity for prefix 
metrics. 
    2. We wanted to have a solution for the default algorithm and topology that 
wouldn’t require
        accessing the OSPF Extended Link opaque LSA or supporting OSPFv3 
Extended LSAs. 
        This should ease deployment. 

Thanks,
Acee

> On Nov 30, 2023, at 22:55, Liyan Gong <[email protected]> wrote:
> 
> 
> Dear Chairs and WG,
> 
> 
> 
> We have updated the draft which incorporated the suggestions from Acee and 
> Loa. Thank you very  much.
> 
> 
> 
> The main changes are as follows:
> 
> 
> 
> add the section 4.1 for "Stub Router Advertisement Backward Compatibility"
> 
> correct the "Router Functional Capabilities TLV”with "Router Informational 
> Capabilities TLV"
> 
> some description optimizations. 
> 
> 
> 
> The draft and diff can be found in the following link.
> 
> https://datatracker.ietf.org/doc/draft-gong-lsr-ospf-unreachable-link/ 
> <https://datatracker.ietf.org/doc/draft-ietf-mboned-multicast-telemetry/08/>
> 
> We would like to request adoption call and look forward to the views of the 
> Working Group. 
> 
> 
> 
> Best Regards,
> 
> Liyan
> 
> 
> 
> ----邮件原文----
> 发件人:internet-drafts <[email protected]>
> 收件人:Acee Lindem <[email protected]>,Changwang Lin 
> <[email protected]>,Liyan Gong <[email protected]>,Mengxiao 
> Chen <[email protected]>,Ran Chen <[email protected]>,Weiqiang Cheng 
> <[email protected]>,Yanrong Liang <[email protected]>
> 抄 送: (无)
> 发送时间:2023-12-01 11:00:04
> 主题:New Version Notification for draft-gong-lsr-ospf-unreachable-link-04.txt
> 
> A new version of Internet-Draft draft-gong-lsr-ospf-unreachable-link-04.txt
> has been successfully submitted by Liyan Gong and posted to the
> IETF repository.
> 
> Name:     draft-gong-lsr-ospf-unreachable-link
> Revision: 04
> Title:    Advertising Unreachable Links in OSPF
> Date:     2023-11-27
> Group:    Individual Submission
> Pages:    9
> URL:      
> https://www.ietf.org/archive/id/draft-gong-lsr-ospf-unreachable-link-04.txt
> Status:   
> https://datatracker.ietf.org/doc/draft-gong-lsr-ospf-unreachable-link/
> HTMLized: 
> https://datatracker.ietf.org/doc/html/draft-gong-lsr-ospf-unreachable-link
> Diff:     
> https://author-tools.ietf.org/iddiff?url2=draft-gong-lsr-ospf-unreachable-link-04
> 
> Abstract:
> 
>    This document proposes the method to advertise links as unreachable
>    in OSPF. In some scenarios, there are requirements to advertise
>    unreachable links in OSPF for purposes other than building the
>    normal Shortest Path Tree.
> 
> 
> 
> The IETF Secretariat
> 
> 
> 
> Subject:New Version Notification for 
> draft-gong-lsr-ospf-unreachable-link-04.txt
> 
> A new version of Internet-Draft draft-gong-lsr-ospf-unreachable-link-04.txt
> has been successfully submitted by Liyan Gong and posted to the
> IETF repository.
> 
> Name:     draft-gong-lsr-ospf-unreachable-link
> Revision: 04
> Title:    Advertising Unreachable Links in OSPF
> Date:     2023-11-27
> Group:    Individual Submission
> Pages:    9
> URL:      
> https://www.ietf.org/archive/id/draft-gong-lsr-ospf-unreachable-link-04.txt
> Status:   
> https://datatracker.ietf.org/doc/draft-gong-lsr-ospf-unreachable-link/
> HTMLized: 
> https://datatracker.ietf.org/doc/html/draft-gong-lsr-ospf-unreachable-link
> Diff:     
> https://author-tools.ietf.org/iddiff?url2=draft-gong-lsr-ospf-unreachable-link-04
> 
> Abstract:
> 
>    This document proposes the method to advertise links as unreachable
>    in OSPF. In some scenarios, there are requirements to advertise
>    unreachable links in OSPF for purposes other than building the
>    normal Shortest Path Tree.
> 
> 
> 
> The IETF Secretariat
> 
> 
> 
> 
> _______________________________________________
> Lsr mailing list
> [email protected]
> https://www.ietf.org/mailman/listinfo/lsr

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