Re: [Idr] WG LC draft-ietf-idr-bgp-gr-notificatoin-02.txt - from 5/27/14 to 6/10/14
"Chris Hall" <chris.hall@highwayman.com> Wed, 28 May 2014 11:45 UTC
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From: Chris Hall <chris.hall@highwayman.com>
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Date: Wed, 28 May 2014 12:44:47 +0100
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Subject: Re: [Idr] WG LC draft-ietf-idr-bgp-gr-notificatoin-02.txt - from 5/27/14 to 6/10/14
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Susan Hares wrote (on Tue 27-May-2014 at 18:19 +0100): .... > Jeff Haas comments that the most recent changes reflect > implementation experience and some word smithing. There is also a > minor clarification in the NOTIFICATION message with respect to > including a data byte so the original reason for the event can be > propagated. (See sec. 3.1 in the diff.) I discovered that draft-00 invented the 'N' bit in the "Flags for Address Family" and draft-01 un-invented it. When this goes forward as an RFC, is this (still-born) 'N' bit then forever deprecated ? [I looked at this and could not, for the life of me, remember an 'N' bit in RFC4724 :-(] I note that Section 3.1 says: "When sending a Hard Reset, the data portion of the NOTIFICATION message MUST be used to indicate the reason for the hard reset. The reason is encoded using a standard BGP Cease error subcode and MAY also include any relevant data subsequent to the subcode." which rather limits what can be indicated... if (say) an UPDATE Message Error (Code=3), Attribute Length Error (Subcode=5) is (for whatever reason) to be sent as a Hard Error, then the reason gets rather lost ? Why not treat the Hard Reset Code=6 Subcode=9 as a two octet prefix on the complete original NOTIFICATION message ? I note, in passing, that the Hard Reset is intended for consenting speakers ("Graceful Notification flag has been exchanged") but there is an absence of MUST. I assume it is deliberate that the sender of an 'N' flag does not have to receive one before it MUST follow the rules of Section 4.1 on receipt of a NOTIFICATION (other than a Hard Reset) ? (It seems that the main effect of receiving an 'N' flag is that the receiver no longer needs to suppress any urge to send a NOTIFICATION, in those cases where triggering a Graceful Restart is considered far more useful than the small amount of information a NOTIFICATION would carry.) Chris [I guess it's all too late now... but a new "Hard Error" Code (Code=7) would avoid getting tangled up with RFC4486, and could be defined to be a one octet prefix for the original NOTIFICATION ? Alternatively... the "Hard Bit" could be encoded as the MS-Bit of the Code octet ? I guess that was considered and rejected as requiring too much IANA paperwork ? Or is there an argument that (other) systems handling NOTIFICATIONs are more likely to be tolerant of new/unknown Subcodes than they are of new/unknown Codes ? In which case... the "Hard Bit" could be encoded as the MS bit of the Subcode ?]
- [Idr] WG LC draft-ietf-idr-bgp-gr-notificatoin-02… Susan Hares
- Re: [Idr] WG LC draft-ietf-idr-bgp-gr-notificatoi… Chris Hall
- Re: [Idr] WG LC draft-ietf-idr-bgp-gr-notificatoi… bruno.decraene
- [Idr] FW: WG LC draft-ietf-idr-bgp-gr-notificatoi… bruno.decraene
- Re: [Idr] FW: WG LC draft-ietf-idr-bgp-gr-notific… John G. Scudder
- Re: [Idr] FW: WG LC draft-ietf-idr-bgp-gr-notific… bruno.decraene
- Re: [Idr] FW: WG LC draft-ietf-idr-bgp-gr-notific… John G. Scudder
- [Idr] Old WGLC for draft-ietf-idr-bgp-gr-notifica… John Scudder
- Re: [Idr] Old WGLC for draft-ietf-idr-bgp-gr-noti… John Scudder
- Re: [Idr] Old WGLC for draft-ietf-idr-bgp-gr-noti… Susan Hares