Re: [spring] SRv6 Network Programming: ENH = 59

Ron Bonica <rbonica@juniper.net> Wed, 08 May 2019 18:55 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Bob Hinden <bob.hinden@gmail.com>, Ole Trøan <otroan@employees.org>
CC: Tom Herbert <tom@herbertland.com>, SPRING WG <spring@ietf.org>, IPv6 List <ipv6@ietf.org>
Thread-Topic: SRv6 Network Programming: ENH = 59
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Date: Wed, 08 May 2019 18:55:44 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/2HuSE11cifvGaktekK-a29Q71pQ>
Subject: Re: [spring] SRv6 Network Programming: ENH = 59
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Bob,

The value 97 is tempting, but it already has a meaning that is slightly different from what the authors of draft-ietf-spring-srv6-network-programming intend. According to RFC 3378, a value of 97 means that the next header will be as depicted in Figure 2 of RFC 3378.

                                                     Ron



Non-Juniper

> -----Original Message-----
> From: Bob Hinden <bob.hinden@gmail.com>
> Sent: Wednesday, May 8, 2019 2:45 PM
> To: Ole Trøan <otroan@employees.org>
> Cc: Bob Hinden <bob.hinden@gmail.com>; Ron Bonica
> <rbonica@juniper.net>; Tom Herbert <tom@herbertland.com>; SPRING WG
> <spring@ietf.org>; IPv6 List <ipv6@ietf.org>
> Subject: Re: SRv6 Network Programming: ENH = 59
> 
> Ole,
> 
> > On May 8, 2019, at 11:13 AM, Ole Troan <otroan@employees.org> wrote:
> >
> > Ron,
> >
> >> <adding the SPRING mailing list, because this is a SPRING draft>
> >>
> >> Folks,
> >>
> >> Sections 4.4 through 4.12 of draft-ietf-spring-srv6-network-programming-
> 00 define a set of SIDs that have the following things in common:
> >>
> >> - they are consumed by the egress node (SL == 0)
> >> - they tell the egress node how to forward the payload into a VPN
> >>
> >> If the payload is IPv4, the next-header value in the SRH must be IP4 (value
> 4).
> >> If the payload is IPv6, the next-header value in the SRH must be IPv6 (value
> 41).
> >> If the payload is Ethernet, the next-header value in the SRH must be No
> Next Header (value 59).
> >>
> >> In the interest of consistency, we should probably allocate a new next-
> header value for Ethernet and use it.
> >
> > It's a fairly precious name space though.
> 
> According to https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__www.iana.org_assignments_protocol-2Dnumbers_protocol-
> 2Dnumbers.xhtml&d=DwIFaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-
> ndb3voDTXcWzoCI&r=Fch9FQ82sir-BoLx84hKuKwl-
> AWF2EfpHcAwrDThKP8&m=ZtmZfCpk7bYpJSSTREggt8Xm8yHpWgrVBTFHi5a
> UtW4&s=Qir8baDHTQf5RGhmFCDSbGShFV8dE_dqL1reoBpkiUE&e=
> 
> 143-252		Unassigned
> 
> Seems like a lot left.  Plus there are many that are clearly not used anymore, so
> there isn’t a shortage.
> 
> 
> 
> > What would a general IP stack do with an Ethernet frame? It's kind of a neat
> feature that "IP processing terminates here".
> > Or are we going to specify Ethernet over IP?
> 
> Look at the the registry, it looks to me we have already
> 
> 97	ETHERIP	Ethernet-within-IP Encapsulation		[RFC3378]
> 
> From the abstract:
> 
>    EtherIP tunnels Ethernet and IEEE 802.3 media access
>    control frames in IP datagrams so that non-IP traffic can traverse an
>    IP internet.
> 
> This be appropriate for SRv6 network programming.
> 
> Bob
> 
> 
> >
> 
> 
> > Cheers,
> > Ole