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Re: [Idr] John Scudder's No Objection on draft-ietf-idr-bfd-subcode-04: (with COMMENT)

John Scudder <jgs@juniper.net> Thu, 12 January 2023 18:34 UTC

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From: John Scudder <jgs@juniper.net>
To: Jeffrey Haas <jhaas@pfrc.org>
CC: "Dale W. Carder" <dwcarder@es.net>, The IESG <iesg@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, Keyur Patel <keyur@arrcus.com>, "draft-ietf-idr-bfd-subcode@ietf.org" <draft-ietf-idr-bfd-subcode@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] John Scudder's No Objection on draft-ietf-idr-bfd-subcode-04: (with COMMENT)
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Date: Thu, 12 Jan 2023 18:33:34 +0000
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Subject: Re: [Idr] John Scudder's No Objection on draft-ietf-idr-bfd-subcode-04: (with COMMENT)
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Sorry for the delay on this. Thanks for the discussion, I’m OK with the SHOULD remaining as they are.

Regards,

—John

> On Jan 4, 2023, at 12:18 PM, Jeffrey Haas <jhaas@pfrc.org> wrote:
> 
> Dale,
> 
> On Wed, Jan 04, 2023 at 10:39:24AM -0600, Dale W. Carder wrote:
>> In looking at RFC 4486 section 4 which describes usage of 8 other Cease
>> NOTIFICATION subcodes, the majority of those (including administrative
>> shutdown) are also SHOULD vs MUST.  It looks like the only MUST for that
>> matter is for exceeding prefix limits.
>> 
>>> Put differently, what language would you want in this document to allow for
>>> "choose the best error code given the full knowledge available"?
>> 
>> When reported up to NMS systems, BFD Down is a leading indicator but to
>> me it would be expected that it is correlated with other data by an operator
>> to determine root cause for a session being down.  We see similar issues
>> for example when BFD is used with IS-IS.
> 
> BGP gets one thing to put into its NOTIFICATION message.  The BGP
> implementation may also lack system-wide knowledge that may be visible in
> correlation of other events in the system by a NMS.
> 
> The best BGP can do here is "this is the reason I'm choosing to report".
> 
>> Dale
> 
> -- Jeff

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