Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2

Ron Bonica <rbonica@juniper.net> Thu, 17 October 2019 21:32 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Date: Thu, 17 Oct 2019 21:32:45 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/kV5gJtCwCgUgAoSMx3ha0rWa6vs>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Pablo,

I see your point. An RFC 4291-style IPv6 address can replace END with USD, but it can't replaced END.X with USD.

                                                            Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Thursday, October 17, 2019 5:45 AM
To: Ron Bonica <rbonica@juniper.net>et>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2

Hi Ron,

Are you sure you get the same behavior with an interface address?

Can you please explain me how do you decapsulate and forward the inner -encapsulated- IPv6 packet on a link with a high IGP metric when the packet arrives with a DA=IPv6 interface address?

Thanks,
Pablo.

From: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Date: Wednesday, 16 October 2019 at 01:59
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>, SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2

Pablo,

You haven't answered my question.

Why specify a USD flavor of END, END.X and END.T when you can get the exact same behavior by populating SID[0] with an IPv6 address that identifies a real interface?

USD seems redundant.

                                        Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2

Ron,

The USD flavour is used in any T.Encaps policy applied within the SR domain.

Cheers,
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: Tuesday, 15 October 2019 at 01:03
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2

Authors,

Sorry, I meant to say USD, not USP.

                         Ron




Juniper Business Use Only
From: Ron Bonica
Sent: Monday, October 14, 2019 2:36 PM
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: draft-ietf-spring-srv6-network-programming :Section 4.16.2

Authors,

The USP flavor of the END, END.X and END.T functions isn't needed.

USP is the default IPv6 behavior. So, if the source node specifies SID[0] as an RFC 4291 address on the SR egress node, you get the USP behavior for free.

                                                           Ron



Juniper Business Use Only