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Re: [spring] draft-ietf-spring-srv6-network-programming - Extraneous functions

Ron Bonica <rbonica@juniper.net> Thu, 12 December 2019 20:28 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: draft-ietf-spring-srv6-network-programming - Extraneous functions
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Date: Thu, 12 Dec 2019 20:28:25 +0000
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - Extraneous functions
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Authors,

Looking more closely at the IANA registry, it seems that you have reserved 8 code points for each of the END, END.X and END.T functions. These 8 codepoints cover all permutations of PSP, USP, and USD.

However, the following permutations make little sense:


  *   <USD, PSP, USP> and <PSP, USP> because you can only pop the SRH once
  *   <USD and USP>, because it is identical to <USD>

Also, is there a use-case for USP, alone?

                                                                               Ron




Juniper Business Use Only
From: Ron Bonica
Sent: Thursday, December 12, 2019 2:56 PM
To: spring@ietf.org
Subject: draft-ietf-spring-srv6-network-programming - Extraneous functions

Folks,

Are there use cases for the following functions:


  *   0x001F - END with PSP, USP and USD
  *   0x0023 - END.X with PSP, USP and USD
  *   0x0027 - END.X with PSP, USP and USD

It seems that if the SRH was removed at the penultimate segment, there is little sense in removing it again at the ultimate segment.

                                                                                                                             Ron


Juniper Business Use Only

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