Re: [mpls] draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04.txt
Loa Andersson <loa@pi.nu> Thu, 04 February 2021 07:13 UTC
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To: tom petch <ietfc@btconnect.com>, "mpls@ietf.org" <mpls@ietf.org>
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From: Loa Andersson <loa@pi.nu>
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Date: Thu, 04 Feb 2021 15:12:57 +0800
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Subject: Re: [mpls] draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04.txt
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Tom, Are you strting to understand why I spent time to clean up the LSP Ping registry :) ?? I'm convinced that by the updates ine draft-ietf-mpls-lsp-ping-registries-update erything in this registry is cöose to coorect. Howeve it is not always clear and it is easy to go wrong. Let us see if I can sort it out (and if you have text for improvements that is fine) LDP Ping has two messages "Echo Request" and "Echo Reply". - both message may carry a "Downstream Detailed Mapping TLV" -- the Downstream Detailed Mapping TLV has a "Labels Stack sub-TLV" --- Labels Stack sub-TL has a "Protocol" code point (see registry "Protocol in Label Stack Sub-TLV of Downstream Detailed Mapping TLV". ---- it is Protocol code point registry that is updated and extended by the draft-ietf-mpls-lsp-ping-ospfv3-codepoint Similarly the "Echo Request" and "Echo Reply" has three TLVs -Type 1 (Target FEC Stack) Type 16 (Reverse Path - Target FEC Stack) Type 21 (Reply Path) -- Each of these TLVs has three sub-TLVs has a Segment ID sub-TLV --- Segment ID su-b-TLV has a "Protocol" code point ---- it is Protocol code point registry that is updated and extended by the draft-ietf-mpls-lsp-ping-ospfv3-codepoint The protocol registgries are not update by draft-ietf-mpls-lsp-ping-registries-update. /Loa On 03/02/2021 17:38, tom petch wrote: > From: Loa Andersson <loa@pi.nu> > Sent: 03 February 2021 05:05 > > Tom, > > While I'm a great fan of references, I don't see that it is necessary in > this case. > > draft-ietf-mpls-lsp-ping-registries-update updates the Message Types, > Reply Modes, Return Codes. TLV and sub-TLV registries. > > The code point for draft-ietf-mpls-lsp-ping-ospfv3-codepoint is > allocated from the "Protocol in the Segment ID sub-TLV" registry. This > registry is not change, so I don't see that the scenario you describe > below could play out. > > <tp> > My starting point is that I cannot make sense of the IANA Considerations in this I-D. They might be clearer if they used the allocated numbers for TLV and sub-TLV. > > It says > " IANA is requested to assign a new code point for OSPFv3 from > "Protocol in Label Stack Sub-TLV of Downstream Detailed Mapping TLV" > registry under the "Multi-Protocol Label Switching (MPLS) Label > Switched Paths (LSPs) Ping Parameters" registry as follows:" > > Downstream Detailed Mapping TLV would appear to be TLV20 so Protocol in Label Stack Sub-TLV should be a sub-TLV of TLV20; there is no such sub-TLV. IANA lists > 1 Multipath data [RFC8029] > 2 Label stack [RFC8029] > 3 FEC stack change [RFC8029] > 4 Local Interface Index [RFC8611] > 5 Remote Interface Index [RFC8611] > > I find that problematic. > > Tom Petch > > > > > > > > > /Loa > > On 03/02/2021 01:39, tom petch wrote: >> I believe that this I-D needs a Normative Reference to >> Updating the IANA MPLS LSP Ping Parameters >> draft-ietf-mpls-lsp-ping-registries-update >> since that I-D updates the registry that this I-D then seeks to update and if this I-D gets there first then the update can be overridden by >> Updating the IANA MPLS LSP Ping Parameters >> draft-ietf-mpls-lsp-ping-registries-update-07 >> and lost. >> >> And this last I-D changes the meaning of the registry which could be seen as theoretically rendering this I-D invalid. >> >> Tom Petch >> >> From: mpls <mpls-bounces@ietf.org> on behalf of internet-drafts@ietf.org <internet-drafts@ietf.org> >> Sent: 27 January 2021 20:58 >> >> A New Internet-Draft is available from the on-line Internet-Drafts directories. >> This draft is a work item of the Multiprotocol Label Switching WG of the IETF. >> >> Title : OSPFv3 CodePoint for MPLS LSP Ping >> Authors : Nagendra Kumar Nainar >> Carlos Pignataro >> Mustapha Aissaoui >> Filename : draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04.txt >> Pages : 6 >> Date : 2021-01-27 >> > > -- > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert loa.pi.nu@gmail.com > Bronze Dragon Consulting phone: +46 739 81 21 64 > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64
- [mpls] I-D Action: draft-ietf-mpls-lsp-ping-ospfv… internet-drafts
- Re: [mpls] I-D Action: draft-ietf-mpls-lsp-ping-o… Nagendra Kumar Nainar (naikumar)
- Re: [mpls] draft-ietf-mpls-lsp-ping-ospfv3-codepo… tom petch
- Re: [mpls] draft-ietf-mpls-lsp-ping-ospfv3-codepo… Loa Andersson
- Re: [mpls] draft-ietf-mpls-lsp-ping-ospfv3-codepo… tom petch
- Re: [mpls] draft-ietf-mpls-lsp-ping-ospfv3-codepo… Loa Andersson