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Re: [Idr] One week extension to WGLC for draft-ietf-idr-large-community

t.petch <ietfc@btconnect.com> Fri, 18 November 2016 11:07 UTC

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From: "t.petch" <ietfc@btconnect.com>
To: "John G. Scudder" <jgs@juniper.net>, idr wg <idr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/WIII2zJh2sWcpck6-sB9hIor_A8>
Subject: Re: [Idr] One week extension to WGLC for draft-ietf-idr-large-community
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John

I am happy with the proposed text but ...

An issue that came up earlier and that I did not see resolved was what
constitutes a duplicate.  This is binary so we don't have the issues
that
character comparisons do but is it the same bit pattern from start to
finish, the same semantics or something between the two?  A case I have
in mind is when the same semantics appear in RFC1997 format and also
in LC format; is that a duplicate?.

Tom Petch

----- Original Message -----
From: "John G. Scudder" <jgs@juniper.net>
To: "idr wg" <idr@ietf.org>
Sent: Wednesday, November 16, 2016 4:01 AM

> Hi Everyone,
>
> After Bruno's comments regarding RFC 7606 style error handling being
invoked to react to duplicate community values, a few people have
expressed (on and off list) concern that even though that is not
intended, the -08 text as written could possibly be misinterpreted by a
zealous implementor. To resolve this, I propose adding the following, or
similar, to the Error Handling section:
>
> o A BGP Large Communities attribute SHALL NOT be considered malformed
due
>   solely to presence of duplicate community values. Such duplicates
MUST be handled
>   by removing them as specified in Section 2.
>
> IMO this clarifies the intent of the document and doesn't represent a
normative change. Hopefully it will resolve the concerns of those who
were concerned about and opposed to 7606-style handling for duplicates.
>
> The authors have indicated they'll incorporate the text in an -09
(assuming of course that the consensus of the WGLC doesn't go against
the change).
>
> Regards,
>
> --John
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr

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