Dear authors, I like the idea of ACH for SRv6, and I think the use cases make sense and expect to see more if such mechanism exists. However, my opinion is that, since ACH packets are dedicated control packets, it might be easier to encapsulate it in UDP payload while using an SRH flag to indicate the presence of ACH, which is more extensible. In fact, I think this draft can be consolidated with our draft "draft-song-spring-siam-01" for supporting IOAM ins SRv6 https://datatracker.ietf.org/doc/html/draft-song-spring-siam-01 because I can see the potential for ACH6 to become a generic mechanism in SRv6 to support OAM and message passing pertaining to specific SR paths. Look forward more discussions on this!
Best, Haoyu -----Original Message----- From: spring <[email protected]> On Behalf Of Yangfan (IP Standard) Sent: Monday, July 12, 2021 7:32 PM To: spring <[email protected]> Subject: [spring] I-D Action: draft-yang-spring-ach6-sr-00.txt Hi SPRING， A new draft was submitted to specify how an ACH6 (associated channel over IPv6) control channel is used in a Segment Routing network. On one hand, SRv6 SIDs list in SRH provides a certain SRv6 path. On the other hand, ACH6 provides the control and management capability to the SRv6 path. Here is some background info if you are not acquainted with ACH6, ACH6 is initially proposed at IETF 110 (https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-yang-rtgwg-ipv6-associated-channel-01&data=04%7C01%7Chaoyu.song%40futurewei.com%7Ccfdb5ba7c6954c1be83a08d945a6762e%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637617403550209876%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Cd%2FpOMGuspvVA1IuCb0uVtxeb6TO%2Bge8qcQlQcPHUas%3D&reserved=0) ACH6 in SR (https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-yang-spring-ach6-sr&data=04%7C01%7Chaoyu.song%40futurewei.com%7Ccfdb5ba7c6954c1be83a08d945a6762e%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637617403550209876%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=NBQbeVePgWFttQOnYf%2BwlMv8MjykYl1P4CYcfK%2FfqzU%3D&reserved=0) and ACH6 OAM mechanism in SR (https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-yang-spring-ach6-oam-sr&data=04%7C01%7Chaoyu.song%40futurewei.com%7Ccfdb5ba7c6954c1be83a08d945a6762e%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637617403550209876%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=pvBifpWgh6UdU5EI0%2F1HqaYZIBGGXeH4oSM6TWwqLtM%3D&reserved=0) are proposed at IETF 111 As always, comments and suggestions are welcome and appreciated. Stay safe. Best regards, Fan (on behalf of authors) -----邮件原件----- 发件人: I-D-Announce [mailto:[email protected]] 代表 [email protected] 发送时间: 2021年7月13日 0:14 收件人: [email protected] 主题: I-D Action: draft-yang-spring-ach6-sr-00.txt A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : ACH6 in Segment Routing Authors : Fan Yang Tianran Zhou Filename : draft-yang-spring-ach6-sr-00.txt Pages : 11 Date : 2021-07-12 Abstract: Associated Channel over IPv6 (ACH6) provides a control channel to one specific IPv6 forwarding path for control and management purpose. When ACH6 is used in a Segment Routing network, it provides a control channel to an SRv6 path. This document specifies an SRv6 ACH6 mechanism and describes how ACH6 is applied in a Segment Routing network. 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