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Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Thu, 23 July 2020 22:37 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Linda Dunbar <linda.dunbar@futurewei.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)
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Date: Thu, 23 Jul 2020 22:37:05 +0000
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Subject: Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)
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Netconf provides needed features that BGP does not have:
- Atomic Transactions:
  If one configuration item fails, they all fail.
  They all either succeed or all fail. There is no partial success.
  Multiple configurations in one transaction are applied at the same time.
   . This avoids non-deterministic transient behavior between application of the first policy and the last.
- Feedback:
  BGP is "spray and pray".
  Netconf provides an acknowledgement that the config either failed or was applied,
  which then allows the controller to take the next steps with
  reliable information about what configuration exists in the network.
- Persistence:
  If the BGP session were to go down, all the configuration it sent will be implicitly withdrawn.

If another AS would not allow a foreign AS to configure it with netconf,
it would not allow it with RPD either.

There are already ways in BGP for an AS to signal preference across AS boundaries:
Med, AS-path length, communities.

Ketan and Robert added other objections.


Regards,
Jakob.

From: Linda Dunbar <linda.dunbar@futurewei.com>
Sent: Thursday, July 23, 2020 3:24 PM
To: Jakob Heitz (jheitz) <jheitz@cisco.com>; idr@ietf.org
Subject: RE: WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)

Jakob,

Can you elaborate those automation configuration methods that are much better and less error prone than the proposed one?
It will take a long time to dig through so many IDR emails to find them.

Thank you very much,
Linda Dunbar

From: Jakob Heitz (jheitz) <jheitz@cisco.com<mailto:jheitz@cisco.com>>
Sent: Thursday, July 23, 2020 5:20 PM
To: Linda Dunbar <linda.dunbar@futurewei.com<mailto:linda.dunbar@futurewei.com>>; idr@ietf.org<mailto:idr@ietf.org>
Subject: RE: WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)

Of course it's better than manual configuration.
That's not much of an argument, because there are plenty of
automatic configuration methods that are much better and
less error prone than this draft as I and others have pointed
out in previous emails.

Regards,
Jakob.

From: Idr <idr-bounces@ietf.org<mailto:idr-bounces@ietf.org>> On Behalf Of Linda Dunbar
Sent: Thursday, July 23, 2020 2:57 PM
To: idr@ietf.org<mailto:idr@ietf.org>
Subject: Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)

I support the WGLC for the draft. I think the proposed distribution of policy can scale much better and less error prone than any manual configuration.

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