[mpls] 答复: Comments about draft-xiong-mpls-path-segment-sr-mpls-interworkinganddifference between Path Segment and BSID
<xiong.quan@zte.com.cn> Mon, 16 September 2019 09:25 UTC
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Subject: [mpls] 答复: Comments about draft-xiong-mpls-path-segment-sr-mpls-interworkinganddifference between Path Segment and BSID
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Hi Dhruv, Thanks for your quick reply! I agree with you that Binding SID can to be used not just for label stack but also stitching in multi-domain scenarios. The interworking scenario which we proposed also belongs to multi-domain scenarios, but as my last email mentioned, the Binding SID can not meet our requirement. For example, the bidirectional path correlation and the per-segment or per-domain OAM/PM/protection can not be achieved by using Binding SID. So could you please give us some suggestions to settle this issue? Thanks, Quan 原始邮件 发件人:DhruvDhody <dhruv.ietf@gmail.com> 收件人:熊泉00091065; 抄送人:Loa Andersson <loa@pi.nu>;Tarek Saad <tsaad.net@gmail.com>;mpls@ietf.org <mpls@ietf.org>;draft-xiong-mpls-path-segment-sr-mpls-interworking@ietf.org <draft-xiong-mpls-path-segment-sr-mpls-interworking@ietf.org>; 日 期 :2019年09月16日 17:03 主 题 :Re: Comments about draft-xiong-mpls-path-segment-sr-mpls-interworkinganddifference between Path Segment and BSID Hi Quan, Thanks for your email.. On Mon, Sep 16, 2019 at 2:12 PM <xiong.quan@zte.com.cn> wrote: > > > Hi Dhruv, > > > Sorry to reply late! Sorry to misunderstand your comment! > > I agree with you. Path Segment and Binding SID are different and each serve a specific purpose. > > I think the use of the binding SID [RFC8402] is recommended to reduce the size of lable stack in our draft. > > But the use of binding SID is not recommended to sticth the inter-domain instead of Path Segment. > But Binding SID was meant to be used not just for label stack reduction, but also for multi-domain scenarios. See - https://tools.ietf.org/html/draft-ietf-pce-binding-label-sid-00#section-1 https://tools.ietf.org/html/draft-filsfils-spring-sr-policy-considerations-03#section-6 The key question is - Why are you NOT using binding segment for stitching? I think you try to explain that below - > > The draft proposed two interworking models including Stitching (section-3..1) and Nesting (section-3.2). > > > For the stitching model, there is no end-to-end Path Segment, the end-to-end path across multiple domanins has been partitioned to several > > domain segments and each domain segment is identified as an inter-domain Path Segment (i-Path). These i-Paths can be used to correlate the > > inter-domain paths whcih can be stitched to an end-to-end path. In the headend node, the i-Path MUST bind the two unidirectional > > paths and correlate the bidirectional path. Moreover, each domain can accomplish the per-segment OAM, PM or protection by using the i-Path. > > If we use Binding SID to stitch the inter-domain, the per-segment or per-domain OAM/PM/protection can not be achieved. > May be you need to use *BOTH* path segment and binding segment then!! But associating the functionality of a binding SID to a path SID is not correct! Thanks! Dhruv > > For the nesting model, an end-to-end Path Segment (e-Path) is existed and the end-to-end OAM/PM/protection can be accomplished by using e-Path. > > In this model, sub-path Path Segment (s-Path) MAY also be defined and used to indicate the intra-domain path when the per-segment or per-domain > > OAM, PM or protection is requried. > > > In both models, the use of the binding SID [RFC8402] is also recommended to reduce the size of lable stack. > > > Best Regards, > > Quan > > > > > 原始邮件 > 发件人:DhruvDhody <dhruv.ietf@gmail.com> > 收件人:熊泉00091065; > 抄送人:Loa Andersson <loa@pi.nu>;Tarek Saad <tsaad.net@gmail.com>;mpls@ietf.org <mpls@ietf.org>;draft-xiong-mpls-path-segment-sr-mpls-interworking@ietf.org <draft-xiong-mpls-path-segment-sr-mpls-interworking@ietf.org>; > 日 期 :2019年09月12日 18:18 > 主 题 :Re: Comments about draft-xiong-mpls-path-segment-sr-mpls-interworkingand difference between Path Segment and BSID > Hi Quan, > > Thanks for your mail and further discussion. > > It is not about Path SID v/s Binding SID, both are needed and each serve a specific purpose. > > The comment I made during 105 was that you are using Path SID to do the function of Binding SID! > > See https://tools.ietf.org/html/draft-xiong-spring-path-segment-sr-inter-domain-00#section-3.1, where you say - > > The border nodes should > install the following MPLS data entries for Path segments: > > incoming label: i-Path > outgoing label: the SID list of the next domain or link + next i-Path > > Here you are not using Path SID for OAM/PM but for the functionality of Binding SID! That seems like a wrong thing to do! > > Thanks! > Dhruv > > On Thu, Sep 12, 2019 at 12:35 PM <xiong.quan@zte.com.cn> wrote: >> >> Hi all, >> >> >> I noticed you proposed comments at the IETF#105 MPLS meeting to the draft "draft-xiong-mpls-path-segment-sr-mpls-interworking". Your comment and review is very appreciated! >> >> >> The Path Segment defined in draft-ietf-spring-mpls-path-segment has been proposed and adopted in Spring WG. >> >> The Path Segment is a path identification for Performance measurement and Bidirectional path correlation and End-to-end Path Protection. >> >> The draft "draft-xiong-mpls-path-segment-sr-mpls-interworking" mainly focus on the SR and MPLS Interworking with Path Segment to provide >> >> end-to-end bidirectional VPN service in inter-domain scenario. >> >> >> I noticed the Binding SID is also used in inter-domain scenario. I think the main difference is as follows: >> >> Binding SID indicates a SID List. Selected path by replace the Binding SID to a SID List. Path Segment indicates a path, it can realize OAM,PM,protection. Selected path by path segment correlation. >> >> Binding SID can not replace path segment in bidirectional path, OAM, PM and protection etc. If we use Binding SID, the per-segment or per-domain OAM/PM/protection can not be achieved. >> >> >> I just start the discussion and comments and suggestions are very welcome! >> >> >> Best Regards, >> >> Quan > >
- [mpls] Comments about draft-xiong-mpls-path-segme… xiong.quan
- Re: [mpls] Comments about draft-xiong-mpls-path-s… Dhruv Dhody
- [mpls] 答复: Comments about draft-xiong-mpls-path-s… xiong.quan
- Re: [mpls] Comments about draft-xiong-mpls-path-s… Dhruv Dhody
- [mpls] 答复: Comments about draft-xiong-mpls-path-s… xiong.quan
- Re: [mpls] Comments about draft-xiong-mpls-path-s… Dhruv Dhody
- Re: [mpls] Comments about draft-xiong-mpls-path-s… Chengli (Cheng Li)
- Re: [mpls] [MPLS]Comments aboutdraft-xiong-mpls-p… xiong.quan