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Re: [Tsv-art] ECMP [Tsvart last call review of draft-ietf-opsec-ipv6-eh-filtering-06]

Stewart Bryant <stewart.bryant@gmail.com> Thu, 06 December 2018 10:33 UTC

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To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Ole Troan <otroan@employees.org>, Gert Doering <gert@space.net>
Cc: tsv-art <tsv-art@ietf.org>, OPSEC <opsec@ietf.org>, IETF-Discussion Discussion <ietf@ietf.org>, draft-ietf-opsec-ipv6-eh-filtering.all@ietf.org
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Thu, 06 Dec 2018 10:32:59 +0000
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Subject: Re: [Tsv-art] ECMP [Tsvart last call review of draft-ietf-opsec-ipv6-eh-filtering-06]
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On 06/12/2018 00:34, Brian E Carpenter wrote:
>
> .
>> Of course it still needs to step through them all to do ECMP even if
>> they are all disabled.
> No it doesn't. That's what the flow label, in a fixed position early in the IPv6 header, is for. A line speed IPv6 router has no need to look at the layer 4 header, even if it's doing both diffserv and ECMP. Looking at transport headers is an IPv4 concept.
>
>

A question for the operators, how widely supported in the flow label?

(a) in native IP
(b) IP over MPLS

Certainly in MPLS and Detnet land I hear about the five or six tuple all 
the time, including the inspection of them during forwarding, but I 
don't hear much spoken about the flow label.

- Stewart

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