Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)

<bruno.decraene@orange.com> Fri, 16 October 2015 15:26 UTC

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From: <bruno.decraene@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Rob Shakir <rjs@rob.sh>, "Shraddha Hegde" <shraddha@juniper.net>, The IESG <iesg@ietf.org>, "Alvaro Retana (aretana)" <aretana@cisco.com>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Date: Fri, 16 Oct 2015 15:26:22 +0000
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Acee,

> From: Acee Lindem (acee) [mailto:acee@cisco.com] > Sent: Friday, October 16, 2015 4:32 PM
> 
> Hi Rob, Alvaro,
> 
> This is a great discussion! It is unfortunate that it did not occur
> earlier on the OSPF WG list. I’d like to determine how we can solicit more
> discussion earlier in the process. See one inline below…
> 
> On 10/16/15, 10:26 AM, "Rob Shakir" <rjs@rob.sh> wrote:
> 
> >
> >Hi Alvaro,
> >
> >On October 16, 2015 at 08:23:44, Alvaro Retana (aretana)
> >(aretana@cisco.com) wrote:
> >> Are you advocating for the draft to specify an ordering scheme, or at
> >>just
> >> leaving it at "MUST be considered unordered"? Your text below says one
> >>or
> >> the other, just wondering about preference.
> >
> >I prefer leaving "MUST be considered unordered” in the document, I
> >currently cannot envisage any use cases that would need to consider
> >ordering (in general, I think this can be dealt with by creating a new
> >tag).
> 
> In thinking about this and case of nondeterministic behavior with varying
> implementation ordering, I think we should keep it as unordered and
> discourage the creation of policies that are sensitive to ordering.

Looks good to me.
This is also in sync with IS-IS prefix admin tag (RFC 5130), which BTW has a section about "Ordering of tags" http://tools.ietf.org/html/rfc5130#section-4

OSPF node tag says:
   The semantics of the tag order has no meaning.  That is, there is no
   implied meaning to the ordering of the tags that indicates a certain
   operation or set of operations that need to be performed based on the
   ordering.


IS-IS prefix tags says:
The semantics of the tag order are implementation-dependent.  That
   is, there is no implied meaning to the ordering of the tags that
   indicates a certain operation or set of operations need be performed
   based on the order of the tags.


i.e. both are quite identical. An option would be to make then identical.

Thanks,
--Bruno 

> Thanks,
> Acee
> 
> 
> 
> >
> >Kind regards,
> >r.


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