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Re: [nvo3] NVO3 WG Adoption of draft-quinn-vxlan-gpe-04

"Paul Quinn (paulq)" <paulq@cisco.com> Wed, 29 April 2015 18:13 UTC

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From: "Paul Quinn (paulq)" <paulq@cisco.com>
To: "sarikaya@ieee.org" <sarikaya@ieee.org>
Thread-Topic: [nvo3] NVO3 WG Adoption of draft-quinn-vxlan-gpe-04
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Date: Wed, 29 Apr 2015 18:13:39 +0000
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Cc: Benson Schliesser <bensons@queuefull.net>, "draft-quinn-vxlan-gpe@ietf.org" <draft-quinn-vxlan-gpe@ietf.org>, "nvo3@ietf.org" <nvo3@ietf.org>, "nvo3-chairs@ietf.org" <nvo3-chairs@ietf.org>
Subject: Re: [nvo3] NVO3 WG Adoption of draft-quinn-vxlan-gpe-04
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> On Apr 29, 2015, at 12:01 PM, Behcet Sarikaya <sarikaya2012@gmail.com> wrote:
> 
> On Tue, Apr 28, 2015 at 5:03 PM, Behcet Sarikaya <sarikaya2012@gmail.com> wrote:
>> Hi Benson,
>> 
>> Joe Touch wrote this on intarea list:
>> 
>> There is no reason for having the GUE header differentiate between
>> payload=IPv4 and payload=IPv6. The IP version is addressed by the
>> version field of the IP header. If GUE encapsulates both type of IP the
>> same way (and it should), it should NOT differentiate between them in
>> its (GUE) header.
>> 
>> 
>> I think the same applies to gpe header.
>> 
>> Plus the issues on the "NSH" protocol.
> 
> Curiously if you look at the nsh draft, Section 3.2,
> 
> NSH Base Header
> 
> also has a next protocol field with the same encoding.
> 
> Anybody understands what is going on?

Yes, the concept is that you don't know what you want to carry via GPE.  Today it might be v4, v6, ethernet, NSH or something else.  Tomorrow, who knows?  But more importantly, we need to enable that stacking to occur.

The format of NSH is orthogonal -- as is the format of Ethernet for that matter.  From an outer header (i.e. VXLAN-GPE or other) you need to be able to identify the inner protocol.  

Paul

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