Hi, Gert: For the "intentional" asymmetric(for TE), we can think other solution to deploy the SAV mechanism on demand. We are trying to solve the "accidental" asymmetric by the BM-SPF features to assure the symmetric routing in default in the operator network. I agree with you, ISP doesn't need to build the symmetric on all paths, especially via the strict requirements of the metric configuration on all interfaces of the all routers within one IGP domain.
But, deploy the SAV mechanism based on one symmetric ensured network(via the BM-SPF feature) can ease the burden of complex revised SPF to accomplish the same aim. Aijun -----邮件原件----- 发件人: [email protected] [mailto:[email protected]] 代表 Gert Doering 发送时间: 2025年2月11日 16:38 收件人: Aijun Wang <[email protected]> 抄送: [email protected]; 'lsr' <[email protected]> 主题: [Lsr] Re: [savnet] [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 Hi, On Tue, Feb 11, 2025 at 09:47:09AM +0800, Aijun Wang wrote: > Once the asymmetrical routing issue is solved and deployed within the > IGP domain, There is not something to "solve". Asymmetric routing in an ISP network is something which can be very intentional (for TE), or accidential (because each IP router decides how and where wants to forward packets). ISP networks can be built to be symmetric on all paths, but that takes conscious effort and brings little benefit, so it is not normally done. So all assumptions that rely on symmetric routing on the inside of a network are flawed, and all solutions that rely on this assumption can not work. 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 -- [email protected] To unsubscribe send an email to [email protected] _______________________________________________ Lsr mailing list -- [email protected] To unsubscribe send an email to [email protected]
