> On Feb 11, 2025, at 8:33 AM, Aijun Wang <[email protected]> wrote: > > Hi, Acee: > > I can only say we have different viewpoints/considerations for the > implementation of protocol and for the operation of the network. > > The implementation of protocol stack is one shot action, but the operation of > network is one continuous activities.
You have to make sure all the routers in the domain support the alternate SPF and have it CONFIGURED - today, this isn't supported and so far no other than yourself thinks this is a good idea. What I'm saying is you just configure consistent metrics in the first place and enforcing consistency is easy to automate. I hope in 2025 no one is logging into routers and configuring them one at a time. Furthermore, the asymmetric IGP case for SAV is one of the easiest to solve - much easy than trying to modify the base SPF behavior for every router in the IGP domain. This just a solution looking for a problem. Acee > > I would like to hear your proposal of automatic solutions, please do not > consider the solution that detect the change of metrics on every link of > every router dynamically and notify the operator to step in intermittently. > > Aijun Wang > China Telecom > >> On Feb 11, 2025, at 19:13, Acee Lindem <[email protected]> wrote: >> >> Again, speaking as WG member: >> >>> On Feb 10, 2025, at 9:34 PM, Aijun Wang <[email protected]> wrote: >>> >>> Hi, Acee: >>> >>> Yes, maybe, but it will require a lot of confirmations on all the links of >>> all the IGP existing routers. It will be one error prone approach, for the >>> existing infrastructure, or for the future deployment. >> >> This would be very easy to automate and not prone to error. Much less so, >> than an assuring an alternate SPF algorithm is uniforming implemented and >> deployed across the entire IGP routing domain. This just isn't a good idea. >> >> Acee >> >> >> >>> >>> Aijun >>> >>> -----邮件原件----- >>> 发件人: [email protected] [mailto:[email protected]] 代表 >>> Acee Lindem >>> 发送时间: 2025年2月11日 10:06 >>> 收件人: Aijun Wang <[email protected]> >>> 抄送: [email protected]; lsr <[email protected]> >>> 主题: [savnet] Re: [Lsr] [BM-SPF: Solve asymmetrical routing within IGP to >>> achieve one simple intra-domain SAV solution] New Version Notification for >>> draft-wang-lsr-bidirectional-metric-spf-00.txt >>> >>> Speaking as a WG member: >>> >>> Since an IGP domain is under a single administrative control, you can just >>> use consistent metrics on your links if this is your intent. >>> >>> Acee >>> >>>>> On Feb 10, 2025, at 20:47, Aijun Wang <[email protected]> wrote: >>>> >>>> Hi, All experts: >>>> >>>> Along the discussions of intra-domain SAV solution, I found the key >>>> obstacle was the asymmetrical routing within the IGP domain. >>>> It reminds me one of my previous thoughts over this issue, then I rewrite >>>> the shelved draft, submit it to the LSR WG, and copy to SAVNET WG for >>>> further discussions. >>>> >>>> Once the asymmetrical routing issue is solved and deployed within the IGP >>>> domain, the solution for the intra-domain SAV will be very simple------the >>>> interfaces(route) to the prefixes in the FIB can be used directly as the >>>> source interfaces from these prefixes----no complex SPF or other new >>>> algorithm necessary again. >>>> >>>> Wish to get more comments or thoughts on this topic. And we are welcome >>>> more experts to join us to forward this draft. >>>> >>>> >>>> Best Regards >>>> >>>> Aijun Wang >>>> China Telecom >>>> >>>> -----邮件原件----- >>>> 发件人: [email protected] [mailto:[email protected]] >>>> 发送时间: 2025年2月11日 9:28 >>>> 收件人: Aijun Wang <[email protected]> >>>> 主题: New Version Notification for >>>> draft-wang-lsr-bidirectional-metric-spf-00.txt >>>> >>>> A new version of Internet-Draft >>>> draft-wang-lsr-bidirectional-metric-spf-00.txt >>>> has been successfully submitted by Aijun Wang and posted to the IETF >>>> repository. >>>> >>>> Name: draft-wang-lsr-bidirectional-metric-spf >>>> Revision: 00 >>>> Title: Bidirectional Metric based Shortest Path First Mechanism >>>> Date: 2025-02-11 >>>> Group: Individual Submission >>>> Pages: 8 >>>> URL: >>>> https://www.ietf.org/archive/id/draft-wang-lsr-bidirectional-metric-spf-00.txt >>>> Status: >>>> https://datatracker.ietf.org/doc/draft-wang-lsr-bidirectional-metric-spf/ >>>> HTMLized: >>>> https://datatracker.ietf.org/doc/html/draft-wang-lsr-bidirectional-metric-spf >>>> >>>> >>>> Abstract: >>>> >>>> This document describes the mechanism that can be used to accomplish >>>> the Shortest Path First(SPF) calculation within network based on the >>>> bidirectional metrics of the links. >>>> >>>> >>>> >>>> The IETF Secretariat >>>> >>>> >>>> >>>> _______________________________________________ >>>> Lsr mailing list -- [email protected] >>>> To unsubscribe send an email to [email protected] >>> >>> -- >>> savnet mailing list -- [email protected] >>> To unsubscribe send an email to [email protected] >>> >> >> > _______________________________________________ Lsr mailing list -- [email protected] To unsubscribe send an email to [email protected]
