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RE: Relationship between draft-chen-rtgwg-srv6-midpoint-protection and draft-ietf-spring-segment-protection-sr-te-paths-03

Huaimo Chen <huaimo.chen@futurewei.com> Tue, 08 November 2022 17:25 UTC

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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "draft-chen-rtgwg-srv6-midpoint-protection@ietf.org" <draft-chen-rtgwg-srv6-midpoint-protection@ietf.org>, "draft-ietf-spring-segment-protection-sr-te-paths@ietf.org" <draft-ietf-spring-segment-protection-sr-te-paths@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: RE: Relationship between draft-chen-rtgwg-srv6-midpoint-protection and draft-ietf-spring-segment-protection-sr-te-paths-03
Thread-Topic: Relationship between draft-chen-rtgwg-srv6-midpoint-protection and draft-ietf-spring-segment-protection-sr-te-paths-03
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Date: Tue, 08 Nov 2022 17:25:28 +0000
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Hi Alex,

   Thanks for your comments.
   My responses are inline below with [HC].

Best Regards,
Huaimo

From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Sent: Tuesday, November 8, 2022 4:50 PM
To: draft-chen-rtgwg-srv6-midpoint-protection@ietf.org; draft-ietf-spring-segment-protection-sr-te-paths@ietf.org
Cc: spring@ietf.org; rtgwg@ietf.org
Subject: Relationship between draft-chen-rtgwg-srv6-midpoint-protection and draft-ietf-spring-segment-protection-sr-te-paths-03

Hi,
There is some obvious similarity between the problem addressed in  the (expired) draft-ietf-spring-segment-protection-sr-te-paths-03<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-segment-protection-sr-te-paths-03&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18b46fb6d63c414c68ea08dac1a94b86%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638035230123834927%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=0RspDPRQoijrfb%2BSz7vBV0oHvlgwp2W7411ij87NG8I%3D&reserved=0> and draft-chen-rtgwg-srv6-midpoint-protection<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-chen-rtgwg-srv6-midpoint-protection-09&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18b46fb6d63c414c68ea08dac1a94b86%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638035230123834927%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=7tSbtegRc9rQ48OF9%2FgL3x9iYGbl4sKcYu3VILfeyIQ%3D&reserved=0>.
[HC]: Both are for midpoint protections.

In the general case, the solutions seem to be quite different because the former draft uses MPLS-specific mechanisms (context label spaces etc.) that are not available with SRv6.
[HC]: You are right. The former is for SR-MPLS path, the latter for SRv6 path.

But Section 6 of the  former draft<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-segment-protection-sr-te-paths-03%23section-6&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18b46fb6d63c414c68ea08dac1a94b86%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638035230123991144%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=S4mAOYXfn%2BBXzbQKTPZW7ltgkT8pfEYucnwCz%2FyiDP8%3D&reserved=0> offers a simple optimization for the special case that looks to me as matching the needs of the latter draft
[HC]: At high level.

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