Hi Zafar,
As a co-author, thank you for your valuable feedback and detailed response. We will update it in the next version by adding ICMP error handling. Yes, the handling of ICMP errors may be correctly processed at the ingress PE, as detailed in Section 4.1.1 of RFC 8986. Thank you again. Thanks, Changwang 发件人: Zafar Ali (zali) <[email protected]> 发送时间: 2026年4月2日 13:13 收件人: [email protected]; 'Zafar Ali (zali)' <[email protected]> 抄送: 'SPRING WG' <[email protected]>; [email protected]; Zafar Ali (zali) <[email protected]> 主题: [spring] Re: Follow up "SID as source" in CE-CE ICMP case(uniform mode) Hi Feng What I meant is that you need to explain in your draft how the source node (which uses a VPN SID as the source address) handles the ICMP error encountered by the data traffic (e.g., MTU exceeded). Given the SID pseudo codes covers the upper layer processing, I think it should be fine. But please document it in your draft. Thanks Regards … Zafar From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Date: Wednesday, April 1, 2026 at 11:46 PM To: 'Zafar Ali (zali)' <[email protected]<mailto:[email protected]>> Cc: 'SPRING WG' <[email protected]<mailto:[email protected]>>, [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>, Zafar Ali (zali) <[email protected]<mailto:[email protected]>> Subject: 回复: [spring] Re: Follow up "SID as source" in CE-CE ICMP case(uniform mode) Hi Zafar, Thanks for your response. In my opinion, the SRv6 compatible with firewall is orthogonal with the ICMP handling. The source SRv6 node will receive ICMP (not encaped by SRv6 header) if the TTL gets expired in the network. There are 2 relevant cases in my head. · Case1: trace route from CE in uniform mode. I did not give proposal. · Case2: Srv6 ping on PE. I gave proposal using VPN SID. If you want have some proposals in the draft. I would say there are 2 existing proposals regarding ICMP handling. Proposal 1 is P node set the VPN SID as ICMP destination address (draft-varhal-6man-icmp-srv6-vpn). Proposal 2 is MPLS style, which forwarding to egress PE(draft-ali-6man-srv6-vpn-icmp-error-handling). Since my draft is to address the firewall issue, I would say handling of ICMP should consider firewall case. To be more clear, the expected ICMP address pair would be a pair of VPN SID. Thus it will not only matter of ingress node, but will also relevant with P and egress PE. BR, Feng 发件人: Zafar Ali (zali) <[email protected]<mailto:[email protected]>> 发送时间: 2026年4月2日 8:51 收件人: [email protected]<mailto:[email protected]> 抄送: 'SPRING WG' <[email protected]<mailto:[email protected]>>; [email protected]<mailto:[email protected]>; Zafar Ali (zali) <[email protected]<mailto:[email protected]>> 主题: [spring] Re: Follow up "SID as source" in CE-CE ICMP case(uniform mode) Hi Feng My comments have nothing to do with the CE-CE trace route in uniform mode proposal in 6man. You need to explain how the source node processes the ICMP error if it receives it from the network. You cannot exclude ICMP error handling from your proposal. Hope it helps. Thanks Regards … Zafar From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Date: Thursday, March 26, 2026 at 2:18 AM To: Zafar Ali (zali) <[email protected]<mailto:[email protected]>> Cc: 'SPRING WG' <[email protected]<mailto:[email protected]>>, [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: Follow up "SID as source" in CE-CE ICMP case(uniform mode) Hi Zafar, Thanks for your comments on SPRING meeting last week. You mentioned the CE-CE ICMP issue with uniform mode in provider network, and there are some proposals in 6man. Here comes my proposal: I would exclude that scenario in the scope of “draft-yang-spring-sid-as-source-address”. Will that be an acceptable solution for you? BR, Feng Yang China Mobile Research Institute ------------------------------------------------------------------------------------------------------------------------------------- 本邮件及其附件含有新华三集团的保密信息，仅限于发送给上面地址中列出的个人或群组。 禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中的信息。 如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ This e-mail and its attachments contain confidential information from New H3C, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!
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