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Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16

"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com> Thu, 17 October 2019 09:40 UTC

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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Ron Bonica <rbonica@juniper.net>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Date: Thu, 17 Oct 2019 09:40:43 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/VgpiZo9R08KTT5vB-aYmVzjH20k>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Hi Ron,

SRH with SL=0 is a functional NOOP but physically present. These flavors remove the physical instance.

Cheers,
Pablo.

From: Ron Bonica <rbonica@juniper.net>
Date: Wednesday, 16 October 2019 at 02:43
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16

Pablo,

I have read all three of these responses, but remain unconvinced.

The PSP and USP flavors both remove an SRH when the value of Segments Left is equal to 0. They do not remove the IP header that is extended by the SRH.
The SRH that is removed is functionally an NOOP, because Segments Left is equal to 0. So why bother to remove it?

                                                                                            Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16

Ron,

You have already asked that same question a few days ago with the same words:
https://mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDRTozcu0$>

and there have been replies to it detailing the use-cases:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDShyO5lJ$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDeiyat5Q$>
https://mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDWG9L5Tl$>

I guess you might have missed them. Please read the replies.

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on behalf of Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org<mailto:rbonica=40juniper.net@dmarc.ietf.org>>
Date: Monday, 14 October 2019 at 20:45
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16

Authors,

Lacking the B.INSERT and T.INSERT functions, can you describe a use-case for the PSP and USP flavors of the END, END.X and END.T functions?

                                              Ron



Juniper Business Use Only

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