Hi Shraddha and Les, Sorry for late reply and thanks for your comments. Yes, the maximum link metric mechanism is an option as described in section 4 of the draft. But, it has two defects which we also wanted to discuss in ietf 114 meeting. Firstly, it restricts the Flex-Algorithm from using IGP-Cost as its metric-type. Secondly, it does not work with OSPF. For OSPF,the links with maximummetric value(65535) are also included in the SPF calculation,even if not preferred. If there are no other preferred paths,the Flex-Algoritnm links will still affect the result of thenormal SPF calculation. Due to the time constraints,The presentation has been moved to the interim meeting on 2022-09-21. For more detail, please refer to the slides. https://datatracker.ietf.org/meeting/114/materials/slides-114-lsr-13-exclusive-link-for-flex-algo-00. In view of these two cases, new protocol extension becomes necessary. As for the backward incompatible issues, we think it can be avoided by deployment. For example, the new extension should be deployed in sync with the Flex-Algo feature, so that all the routers in one IGP domain will run the same software version. Looking forward to your reply. Best Regards, Liyan ----邮件原文----发件人："Les Ginsberg \\(ginsberg\\)" <[email protected]>收件人：Shraddha Hegde <[email protected]>,"[email protected]" <[email protected]>抄 送: (无)发送时间：2022-07-29 21:14:08主题：Re: [Lsr] Comments on draft-gong-lsr-exclusive-link-for-flex-algo I fully agree with Shraddha. In fact Section 4 of the draft makes clear why no protocol extensions are needed. Les From: Lsr <[email protected]> On Behalf Of Shraddha Hegde Sent: Friday, July 29, 2022 2:18 AM To: [email protected] Subject: [Lsr] Comments on draft-gong-lsr-exclusive-link-for-flex-algo Authors, I suggest that the usecase can be satisfied using the backward compatible Maximum link metric mechanism defined in the draft. I don’t see any need to define protocol extensions, that are backward incompatible and can cause serious issues in the network in the presence of older implementations. Rgds Shraddha Juniper Business Use Only
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