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Re: [Idr] Mail regarding draft-ietf-idr-bgp-open-policy

Brian Dickson <brian.peter.dickson@gmail.com> Wed, 31 July 2019 20:48 UTC

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From: Brian Dickson <brian.peter.dickson@gmail.com>
Date: Wed, 31 Jul 2019 13:48:16 -0700
Message-ID: <CAH1iCion=v7=9ozk0YoLZA5EhYxc4twaoN_PpphMBWp3-O=yOw@mail.gmail.com>
To: Zhuangshunwan <zhuangshunwan@huawei.com>
Cc: "idr@ietf.org" <idr@ietf.org>
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Subject: Re: [Idr] Mail regarding draft-ietf-idr-bgp-open-policy
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On Tue, Jul 30, 2019 at 7:50 PM Zhuangshunwan <zhuangshunwan@huawei.com>
wrote:

> Hi guys,
>
>
>
> Section 9 of draft-ietf-idr-bgp-open-policy-06 says:
>
> …
>
>    This document defines a new optional, transitive BGP Path Attributes
>
>    option, named "Only To Customer", assigned value <TBD3> [To be
>
>    removed upon publication: http://www.iana.org/assignments/bgp-
>
>    parameters/bgp-parameters.xhtml#bgp-parameters-2] [RFC4271].  The
>
>    length of this attribute is 0.
>
>
>
> [Comment]  The length of this attribute should be 4 per the description of
> section 6.
>
> Type 35 with the name “Internal Only To Customer” has been assigned to
> previous version of draft-ietf-idr-bgp-open-policy. Can we simply use Type
> 35 for "Only To Customer" attribute, or apply a new one?
>
>
IMNSHO, apply for a new one.
(It's not like there is a danger of running out any time soon.)

Technically, the previous one had different meaning/semantics, and was
assigned.
The principal of "don't re-use, no matter what" should apply to be 100%
certain no one did an early implementation that now conflicts with the new
semantics.
It is the only way to be safe for absolute certain.

Brian


>  Thanks,
>
> Shunwan
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