Re: [lisp] Mirja Kühlewind's Discuss on draft-ietf-lisp-gpe-05: (with DISCUSS and COMMENT)

Fabio Maino <> Thu, 20 September 2018 20:22 UTC

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To: =?UTF-8?Q?Mirja_K=c3=bchlewind?= <>, The IESG <>
Cc:, Luigi Iannone <>,,
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From: Fabio Maino <>
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Date: Thu, 20 Sep 2018 13:22:09 -0700
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Subject: Re: [lisp] =?utf-8?q?Mirja_K=C3=BChlewind=27s_Discuss_on_draft-ietf-?= =?utf-8?q?lisp-gpe-05=3A_=28with_DISCUSS_and_COMMENT=29?=
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Thanks for your notes Mirja.

I'll publish an updated rev this evening to consolidate the changes that 
I believe we have agreed upon, and then I'll work on those that are 
still open.

Please see below.

On 9/19/18 12:42 PM, Mirja Kühlewind wrote:
> Mirja Kühlewind has entered the following ballot position for
> draft-ietf-lisp-gpe-05: Discuss
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
> Please refer to
> for more information about IESG DISCUSS and COMMENT positions.
> The document, along with other ballot positions, can be found here:
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> Thanks for addressing the TSV-ART review (and Magnus for doing the review)! I
> assume that the proposed text will be incorporated in the next version. (Would
> have been even better if those (larger) changes would have been added before
> the doc was put on the telechat; please update as soon as possible so other AD
> can review that text as well).
> However, I think the text still needs to say more about HOW the PCP should be
> mapped to DSCPs. RFC8325 doesn't provide guidelines but a mapping for 802.11.
> Is the same mapping applicable here?

Agree. As pointed out by Magnus' latest email there's more investigation 
needed here. I'll get back on this.

> Also, I'm not an expert for that part, but I guess there also is further
> guidance needed on HOW to map the VID...?

This is really straightforward, as the VID is a 12-bit field, and the 
IID is 24-bit. Implementation that I'm aware of typically carve a 
portion of the IID space to encode the VID.

> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> Given this doc uses the last reserved bit in the lisp header, I would really
> like to see more discussion how the data plane lisp can still be extended. I
> think the solution is straight-forward (define a shim layer for the extension
> and announce this capability in the Map-Reply), however, spelling this out
> seems to be appropriate for this doc.

Correct, that's the idea. I'll add a sentence that states that a 
lisp-gpe next protocol header can be used to extend the lisp data-plane