[Pce] Shepherd's Review of draft-ietf-pce-binding-label-sid

julien.meuric@orange.com Fri, 28 May 2021 17:47 UTC

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Subject: [Pce] Shepherd's Review of draft-ietf-pce-binding-label-sid
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Dear authors,

Please find below the review of the aforementioned document.

The document looks ready for publication, but the fixes below should be


- The phrase "network opacity" feels like a negative objective. How
about "network confidentiality"?
- s/RSVP-TE signaled Traffic/RSVP-TE-signaled Traffic/
- s/Label Switching Path/Label Switched Path/

1. Introduction
- s/either set up using the RSVP-TE signaling protocol or Segment
Routing/set up using either the RSVP-TE signaling protocol or Segment
- s/headend node/head-end node/  [x2, for consistency along the I-D]
- s/an Segment Routing Policy/a Segment Routing Policy/
- s/an Segment Routed (SR) Policy/a Segment Routing (SR) Policy/
- s/enables instantiation/enables the instantiation/
- s/type of interfaces or tunnel/type of interface or tunnel/
- s/SID-list/SID list/
- s/Path Computation Element Protocol/PCE communication Protocol/
- s/a network controller (acting as a PCE) /a PCE (acting as a network
- s/SID allocated by it/SID it allocated/
   A PCC could report the binding label/SID allocated by it to the
   stateful PCE via Path Computation State Report (PCRpt) message.
   A PCC could report to the stateful PCE the binding label/SID it
   allocated via a Path Computation LSP State Report (PCRpt) message.

- s/Path Computation Update Request (PCUpd) message/Path Computation LSP
Update Request (PCUpd) message/
- s/an MPLS label or SID/an MPLS label or a SID/
- s/PCE based/PCE-based/

3. Terminology
- "TLV" is flagged as "well know" in the RFC Editor's list
(https://www.rfc-editor.org/materials/abbrev.expansion.txt): it can
safely be removed from this section (otherwise, it should have been
expanded at 1st occurrence in the introduction).
- "PCE" is similarly flagged, but PCC and PCEP aren't, so it can be kept
(adding a period at the end of the line).
- s/Path Computation Element Protocol/Path Computation Element
communication Protocol/

4. Path Binding TLV
- s/TLV is called/TLV called/
- Since it's already allocated, Figure 2 may include the codepoint, i.e.
"Type = 55".
- s/TLV comprise of:/TLV comprises:/
- s/and first 20 bits/and the first 20 bits/
- s/a 16 octet IPv6 address/a 16-octet IPv6 address/
- s/Note that, multiple/Note that multiple/
- s/Following flag/The following flag/
- s/For the BT as 0/When the BT is 0/  [idem w/ 1 and 2]
- s/the 32-bits represent/the 32 bits represent/
- s/the 128-bits represent/the 128 bits represent/
- s/This section specify/This section specifies/
- s/The Binding Value consist of/The Binding Value consists of/
- s/The 128-bits IPv6 address/The 128-bit IPv6 address/

5. Operation
- s/via PCRpt message/via a PCRpt message/
- s/send PCErr with/send a PCErr with/
- s/existing instances/the existing instances/
- s/the old binding value/the former binding value/
- s/Note that, other instances/Note that other instances/
- s/a specific binding value(s)/a (or several) specific binding value(s)
- s/Note that in case of an error,/Note that, in case of an error,/
- s/can carry/can include/
- s/request withdrawal/request the withdrawal/  [x2]
- s/the old binding value/the former binding value/
- s/making the length field of the TLV as 4/bringing the Length field of
the TLV to 4/
- s/request PCC/request a PCC/

8. PCE Allocation of Binding label/SID
- s/on its own accord/of its own accord/  [x2]
- s/A PCC would set this bit/A PCC MUST set this bit/
- s/A PCE would set this bit/A PCE MUST set this bit/
- s/towards PCC/towards the PCC/
- s/a PCE would set this bit to 0/a PCE MUST set this bit to 0/
- s/a PCE could set/a PCE MUST set/

A PCC could request that the PCE allocate the binding label/SID by
setting P=1, D=1, and including...
To request that the PCE allocate the binding label/SID, a PCC MUST set
P=1, D=1, and include...

- s/The PCE would allocate/The PCE SHOULD allocate/
- The paragraph about by-PCE allocation should say what happens
otherwise, i.e. error behavior.
- s/out of scope of/out of the scope of/

9. Implementation Status
- Huawei: "An experimental code-point is used and plan to request early
code-point allocation from IANA after WG adoption." If the
implementation doesn't use the early allocated code point, I wonder if
it was worth the effort.
- Cisco: "An experimental code-point is currently used." Currently in
April 2021? Same comment as above.

11. Manageability Considerations
- s/the policy based on which PCC needs to allocates /the policy the PCC
needs to apply when allocating/
- s/Mechanisms defined/ The mechanisms defined/  [x4]
- s/to PCEP extensions defined/to the PCEP extensions defined/

12. IANA Considerations
- The new Error-Type entry should include Error-value 0 as Unassigned.

14. References
- When reading section 7, draft-ietf-pce-segment-routing-ipv6 really
felt like a normative reference: it should be moved to section 14.1.