Hi, Acee: Speak as WG member. Would like to illustrate the scenario that the operators want to make intentionally the traffic asymmetric? On the contrary, as one member from the operator, we are trying to eliminate the asymmetric routing now, not intense it. The BM-SPF is one efficient tool to eliminate this abnormal traffic routing.
>From my POV, the asymmetric routing is one historical problem that leads by the impossible control of bi-directional cost for every link on every router, which should be corrected. BTW, if we can assure the symmetric routing within the IGP network, regardless of the historical, current, or in future manual configuration, it can give us many benefits(traffic identify, control and QoS assurance etc.), not only the intra-domain SAV solution. Another point is that, if we adopt the BM-SPF, we don't need RFC 8500 and RFC 9339 for the reverse metric based solutions to accomplish the traffic diversion then. Best Regards Aijun Wang China Telecom -----邮件原件----- 发件人: Acee Lindem [mailto:acee.i...@gmail.com] 发送时间: 2025年2月12日 0:46 收件人: Gert Doering <g...@space.net> 抄送: Aijun Wang <wangai...@tsinghua.org.cn>; sav...@ietf.org; lsr <lsr@ietf.org> 主题: Re: [savnet] [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 > On Feb 11, 2025, at 11:11 AM, Gert Doering <g...@space.net> wrote: > > Hi, > > On Tue, Feb 11, 2025 at 10:56:37AM -0500, Acee Lindem wrote: >> I hope in 2025 no one is logging into routers and configuring them one at a time. > > You'd be surprised... > > But that said, there are very good reasons to intentionally configure > different SPF costs left and right of a link. So assuming that by > magic both the intentional and the accidential "non-symmetric" costs > disappear won't work. I'm not disputing that there is not a reason for configuring non-symmetric cost - however, if they are configured, it is assumed this intentional and they should be used. Not using the asymmetric cost to simplify SAV is just contradictory. Thanks, Acee > > Also, even on symmetric costs, be careful with ECMP links. > > Gert Doering > -- NetMaster > -- > have you enabled IPv6 on something today...? > > SpaceNet AG Vorstand: Sebastian v. Bomhard, Ingo Lalla, > Karin Schuler, Sebastian Cler > Joseph-Dollinger-Bogen 14 Aufsichtsratsvors.: A. Grundner-Culemann > D-80807 Muenchen HRB: 136055 (AG Muenchen) > Tel: +49 (0)89/32356-444 USt-IdNr.: DE813185279 _______________________________________________ Lsr mailing list -- lsr@ietf.org To unsubscribe send an email to lsr-le...@ietf.org
