Re: [Anima] 答复: Request for presentation

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 03 November 2020 19:58 UTC

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To: Michael Richardson <mcr+ietf@sandelman.ca>, "anima@ietf.org" <anima@ietf.org>
References: <e102ab87b92f44b987a0013e9a3b0874@huawei.com> <20201102155453.GR48111@faui48f.informatik.uni-erlangen.de> <7c189c052c6943408e072390d09b2d41@huawei.com> <adb28277-1f1b-edb6-7e04-aeaad00a7d88@gmail.com> <8979.1604420661@localhost>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Wed, 4 Nov 2020 08:58:42 +1300
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On 04-Nov-20 05:24, Michael Richardson wrote:
> 
> I've only very briefly scanned
>    https://tools.ietf.org/html/draft-li-rtgwg-protocol-assisted-protocol-03
> 
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>     > I don't really understand why you might need a new protocol for
>     > this. It sounds like a very good application for the ANIMA model, and
>     > everything you describe could easily be expressed in GRASP objectives
>     > (synchronization or negotiation are both covered). You discuss this in
>     > Section 7.
> 
> I'd split this up in three points:
> 
> 1) It seems like a very good use for the ACP.
>    If you are debugging a protocol problem, then you likely have some part of
>    the network that has reachability issues.
> 
> 2) I think that the ACP eliminates the need for PAP to be peer to peer, or
>    for it to be UDP.
>    It should be between the NOC and the router, not between routers.
> 
> 3) GRASP CLEARLY has a place in discovering the routers which speak this
>    protocol, and/or in having the routers discover the PAP collector in the NOC.
> 
> 
> Whether or not GRASP is the right way to transfer the data itself, I'm not
> sure.  I'm unclear if access to the raw routing protocol frames (OSPF, BGP,
> etc.) is desired, or if some higher-level debug is envisioned.

Yes. GRASP could be used for the discovery and to set up communication,
even if the actual communication uses something else. In any case, using the
ACP for secure transport seems obvious.

(By the way, I did experimentally add a raw send() recv() pair to GRASP,
so that it could be used as a clear channel after discovery. That isn't
in the GRASP spec but it is in my code.)

> 
> If raw protocol, then it seems like a span/mirror/ functionality using IPFIX
> or PCAPNG [over ACP] would be appropriate.
> 
> If you want higher-level diagnostics, then I would use RESTCONF and YANG.
> 
> --
> Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
>            Sandelman Software Works Inc, Ottawa and Worldwide
> 
> 
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