Re: [Idr] AD Review of draft-ietf-idr-tunnel-encaps-15

John Scudder <jgs@juniper.net> Fri, 18 September 2020 16:04 UTC

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From: John Scudder <jgs@juniper.net>
To: Alvaro Retana <aretana.ietf@gmail.com>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-tunnel-encaps@ietf.org" <draft-ietf-idr-tunnel-encaps@ietf.org>
Thread-Topic: AD Review of draft-ietf-idr-tunnel-encaps-15
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Subject: Re: [Idr] AD Review of draft-ietf-idr-tunnel-encaps-15
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A couple replies below.

> On Sep 17, 2020, at 6:17 PM, Alvaro Retana <aretana.ietf@gmail.com> wrote:
> 
> [External Email. Be cautious of content]
> 
> 
> On September 11, 2020 at 11:25:31 AM, John Scudder wrote:
> 
> John:
> 
> Hi!
> 
> Just a couple of comments...  Just one actionable change related to
> the reachability issue: you're right, we should move on.
> 
> Thanks!
> 
> Alvaro.
> 
> 
> 
> ...
>>> ...
>>>> We added 5566 and 5640 to the list of obsoleted RFCs, along with an
>>>> explanation.
>>> 
>>> [major] The IANA assignments made for those RFCs need to be declared
>>> obsolete in the IANA Considerations section.
>> 
>> Is “obsolete” an IANA thing? I’ve added a subsection to the IANA section as
>> requested, but asked them to mark the code points as “deprecated”.
> 
> 
> Yes, "obsolete" is an IANA thing. rfc8126: "Specific entries in a
> registry can be marked as "obsolete" (no longer in use) or
> "deprecated" (use is not recommended)."
> 
> You used both terms in §13.1 to refer to the code points.  You're
> right, deprecating is the right action, but IANA may be confused by
> the use of both.  This is a minor point, so we can wait for them to
> ask about it. :-)

OK. I’ve left it as written, as you suggested, since I’m afraid further text twiddling by me would just muddy the waters.

…

>>>>> 1080 5. Semantics and Usage of the Tunnel Encapsulation attribute
> ...
> 
>> All of this is true. Basically, we can either hang progress of this
>> document up for a potentially long time waiting for something that may
>> never come: a detailed specification of exactly when a route is, and isn’t,
>> resolvable, or we can admit it’s an imperfect world and move forward. I
>> will observe that despite 4271’s lack of prescriptiveness, somehow we have
>> many interoperable implementations of BGP. I suspect this is because when
>> an implementor looks at route resolution, it’s a little like Justice Potter
>> Stewart looking at other material: “[I can’t define it but] I know it when
>> I see it.”
>> 
>> I tried to make the paragraph clearer by adding a final clause. The last
>> sentence now reads, "The reachability condition is evaluated as per
>> [RFC4271], but the essence is that if the router could forward a packet
>> addressed to the IP address, the IP address is "reachable”.” We could
>> absolutely pick this short summary to shreds if we chose — see above. It’s
>> not meant to be prescriptive, only descriptive.
> 
> 
> Ok.
> 
> Let's go with an "intermediate" approach, so that we don't try to say
> too much, but (hopefully) say enough:
> 
> NEW>
>   *  The tunnel is specified in a TLV whose Tunnel Egress Endpoint sub-TLV
>      identifies an IP address that is reachable.  The reachability condition
>      is evaluated as per [RFC4271].  If the IP address is reachable via
>      more than one forwarding table, local policy is used to determine
>      which table to use.

Done, thanks.

—John