Re: [Idr] Poll on the RFC5575bis implementations about the suggested changes during IETF review

Alvaro Retana <aretana.ietf@gmail.com> Thu, 30 April 2020 11:14 UTC

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From: Alvaro Retana <aretana.ietf@gmail.com>
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Date: Thu, 30 Apr 2020 04:14:16 -0700
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To: Jeffrey Haas <jhaas@pfrc.org>, "Dongjie (Jimmy)" <jie.dong@huawei.com>
Cc: "Kirill.Kasavchenko@netscout.com" <kirill.kasavchenko@netscout.com>, "jhaas@juniper.net" <jhaas@juniper.net>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "thomas.mangin@exa.net.uk" <thomas.mangin@exa.net.uk>, IDR List <idr@ietf.org>
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Subject: Re: [Idr] Poll on the RFC5575bis implementations about the suggested changes during IETF review
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On April 29, 2020 at 10:41:32 PM, Jeffrey Haas wrote:


Jeff:

Hi!


...
> The pattern we normally want to see is "MUST be set to zero and SHOULD be
> ignored on receipt".
>
> By requiring it to be set, you have expectations for a compliant
> implementation of a given draft.
>
> By ignoring it on receipt, you permit the field to be used for something
> further in the future.
>
> The above is consistent with Postel's Maxim.

That makes sense.



> With regard to Juniper's implementation:
> - In sections 4.2.1.1 and 4.2.1.2 for operators, we originate zeroes when
> generating new NLRI in the reserved bits and we ignore them on receipt.
> However, we also propagate what we are sent and use when we're not the
> originator of that NLRI.

To make sure I understand: if 0s are not received, you ignore the
value and process the NLRI.

Does this behavior also apply to §4.2.2.12 (Fragment)?


Thanks!

Alvaro.