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

"Wang, Weibin (NSB - CN/Shanghai)" <> Fri, 18 October 2019 00:39 UTC

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From: "Wang, Weibin (NSB - CN/Shanghai)" <>
To: Ron Bonica <>, "Pablo Camarillo (pcamaril)" <>, SPRING WG List <>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Date: Fri, 18 Oct 2019 00:39:25 +0000
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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I think also including END.T which will select specific FIB,  and  the 4291-style IPv6 address may be in last SID entry in Last SRH of Packet, other SID may not be rfc429-style IPv6@;

Cheers !

WANG Weibin

From: spring <> On Behalf Of Ron Bonica
Sent: 2019年10月18日 5:33
To: Pablo Camarillo (pcamaril) <>om>; SPRING WG List <>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2


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


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From: Pablo Camarillo (pcamaril) <<>>
Sent: Thursday, October 17, 2019 5:45 AM
To: Ron Bonica <<>>; SPRING WG List <<>>
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?


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


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.


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From: Pablo Camarillo (pcamaril) <<>>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <<>>; SPRING WG List <<>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2


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


From: spring <<>> on behalf of Ron Bonica <<>>
Date: Tuesday, 15 October 2019 at 01:03
To: SPRING WG List <<>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2


Sorry, I meant to say USD, not USP.


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From: Ron Bonica
Sent: Monday, October 14, 2019 2:36 PM
To: SPRING WG List <<>>
Subject: draft-ietf-spring-srv6-network-programming :Section 4.16.2


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.


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