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Re: [Idr] [GROW] draft-snijders-idr-shutdown-00: Drop a line in the peer's syslog at shutdown

<bruno.decraene@orange.com> Fri, 18 November 2016 08:32 UTC

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From: bruno.decraene@orange.com
To: Job Snijders <job@instituut.net>
Thread-Topic: [GROW] [Idr] draft-snijders-idr-shutdown-00: Drop a line in the peer's syslog at shutdown
Thread-Index: AQHSQTUgzgPaS1LkJkWurev+wE+hi6DeaEhA
Date: Fri, 18 Nov 2016 08:32:19 +0000
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References: <20161116061556.GG1073@dhcp-9341.meeting.ietf.org> <20161117013640.GB6217@pfrc.org> <16426_1479400131_582DDAC3_16426_1669_1_53C29892C857584299CBF5D05346208A1EC87201@OPEXCNORM2F.corporate.adroot.infra.ftgroup> <20161118004548.GK1072@dhcp-9341.meeting.ietf.org>
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Subject: Re: [Idr] [GROW] draft-snijders-idr-shutdown-00: Drop a line in the peer's syslog at shutdown
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> From: Job Snijders [mailto:job@instituut.net]  > Sent: Friday, November 18, 2016 1:46 AM
> 
 > On Thu, Nov 17, 2016 at 04:28:50PM +0000, bruno.decraene@orange.com wrote:
 > > I support the draft.
 > > I also support Jeff's idea to re-use existing sub-code(s).
 > 
 > Thanks for your support. Based on the feedback received so far the next
 > version of this draft will recycle Cease subcode 2.
 > 
 > > 1 possible comment: the length of the "Shutdown Communication" field
 > > seems implied from the length of the data field, rather than being
 > > explicitly indicated.
 > 
 > The text is explicit about the length:
 > 
 >     "followed by a freeform UTF-8 encoded string with a REQUIRED maximum
 >     length of 128 octets. "
 > 
 > and further:
 > 
 >     "This document tries to minimize the effects of visual spoofing by
 >     allowing UNICODE only where local script is expected and needed, and
 >     by limiting the length of the Shutdown Communication."
 > 
 > > If so, it seems that we are closing the possibility to advertise
 > > additional data/usage, in some future. What about adding a TLV format?
 > 
 > I object to using a TLV. Don't forget this is already at a TLV level:
 > Cease NOTIFICATION. If one would want to define a TLV inside this TLV, a
 > new Cease subcode can be requested from IANA.

What if someone needs to advertise additional info to an existing cease subcode? cf Jeff's email regarding the pain of changing subcodes.
So let's forget about the TLV. What about just adding the length of the string? This would still allow adding fields after the string, while having a negligible/null cost?

Kind regards,
-- Bruno 

 > Kind regards,
 > 
 > Job

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