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Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosmarking-01.txt

Dino Farinacci <farinacci@gmail.com> Thu, 13 November 2014 20:02 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Cc: Benson Schliesser <bensons@queuefull.net>, "nvo3@ietf.org" <nvo3@ietf.org>, "draft-xia-nvo3-vxlan-qosmarking@tools.ietf.org" <draft-xia-nvo3-vxlan-qosmarking@tools.ietf.org>
Subject: Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosmarking-01.txt
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On Thu, Nov 13, 2014 at 12:06 AM, Dino Farinacci <farinacci@gmail.com> wrote:
>>> Specifically, one could imagine the NVE copying the IP1 DSCP codepoint into the IP2 header. Alternatively one could
>> 
>> Exactly. Thanks Benson.
> 
> Dino, yes, but this requires DPI at the NVE, as we already talked

No it doesn't.

> about in the draft as well as configuration to use diffserv.
> RFC7348 does not mention any requirement for NVE to look beyond Inner
> Ethernet Header into the Original Ethernet Payload in order to make
> its encapsulation.

This is very simple. Let me sequence the steps on the encapsulator as well as the decapsultor:

(1) A 802.1Q frame arrives at an encapsulator.
(2) The encapsulator will encapsulate the frame with an outer IP header. It copies the EXP bits from the frame to the outer IP header TOS bits.
(3) The decapsulator receives the IP packet, it strips the outer IP header and DOESNOT copy the TOS bits to the EXP bits of the frame because the TOS field could have been changed in transit. The EXP bits, set by the originating source are perserved.

Dino

> 
> Regards,
> 
> Behcet
> 
>> 
>> Dino

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