[ippm] Re: draft-ietf-ippm-capacity-protocol-14 ietf last call Opsdir review

[[e-mail]]

Hi Tianran, 

Can you please let us know whether the changes made by the authors address your comments? Thank you.

Cheers,
Med

> -----Message d'origine-----
> De : [e-mail] <[e-mail]>
> Envoyé : mercredi 21 mai 2025 11:41
> À : [e-mail]; [e-mail]; BOUCADAIR Mohamed
> INNOV/NET <[e-mail]>
> Cc : [e-mail]; [e-mail];
> [e-mail]
> Objet : AW: draft-ietf-ippm-capacity-protocol-14 ietf last call
> Opsdir review
> 
> 
> Hi Tianran, hi Med,
> 
> draft version -17, which just has been published, contains added
> text to explain the pdu fields.
> 
> Regards,
> 
> Ruediger
> 
> -----Ursprüngliche Nachricht-----
> Von: Tianran Zhou via Datatracker <[e-mail]>
> Gesendet: Dienstag, 6. Mai 2025 06:05
> An: [e-mail]
> Cc: [e-mail]; [e-mail];
> [e-mail]
> Betreff: draft-ietf-ippm-capacity-protocol-14 ietf last call Opsdir
> review
> 
> <snip>
> 
> In general, this document is clear to me. I did not see any special
> operational or network management related issue. But there are
> several minor issues, for the authors consideration.
> 
> minor issues：
> 1. In section 5.1
> "testPort: The UDP ephemeral port number on the server that the
> client has to use for the Test Activation Request and subsequent
> Load or Status PDUs."
> Accorrding to 5.2.2, server will be assigned an UDP port after
> receiving a request. Why the request carries the server test port?
> Do you mean the client assigns the server test prot? But I am not
> sure if it's a safe mechanism.
> 
> [Authors]: CHANGE: testPort: Set to zero in the Test Setup Request
> and populated by the server in the Test Setup Response. It contains
> the UDP ephemeral port number on the server that the client has to
> use for the Test Activation Request and subsequent Load or Status
> PDUs.
> Section 5.2.2, CHANGE: ... (with the port number communicated back
> to the client in testPort field of the Test Setup Response).
> 
> --------------
> 
> 2. In section 5.1
> "maxBandwith: When this field is non-zero, it is a specification of
> the maximum bit rate the client expects to send or receive during
> the requested test. The server compares this value to its currently
> available configured limit for test admission control. This field
> MAY be used for rate-limiting the maximum rate the server should
> attempt. The maxBandwidth field's most significant bit, the
> CHSR_USDIR_BIT, is set to 0 by default to indicate
> comment："downstream" and has to be set to 1 to indicate
> "upstream"." What's the unit of the maxBandwith, bps, Bps, or Kbps
> or Mbps? I see you mentioned "bit rate". Do you indicate the bps? I
> would suggest you to make it explicitly.
> 
> [Authors]: ADD/CHANGE: maxBandwith: When this field is non-zero, it
> is a specification of the maximum bit rate the client expects to
> send or receive during the requested test in Mbps.
> 
> --------------
> 
> 3. In section 5.1
> "checkSum: An optional checksum of the entire PDU. The calculation
> is done with the fields checksum, authMode and those following after
> authMode set to zero."
> It seems the checkSum is optional. But I think it's mondatory if
> auth/encryption is not on, in order to find out bit error.
> 
> [Authors]: Section 4.5, last sentence is covering the requirement
> (indirectly, though): However, because authentication is not
> applicable to the Load PDU, the checkSum field SHALL be utilized by
> the sender whenever UDP data integrity may be uncertain (as outlined
> above).
> Section 4.5, 1st sentence CHANGE: ... header checksum that covers
> the various fields in the UDPST PDU (excluding the Payload Content
> of the Load PDU and, to be clear, also the IP- and UDP-header).
> All instances of checkSum, CHANGE: checkSum: An optional checksum of
> the entire PDU (see Section 4.5 for guidance)....
> 
> ---------------
> 
> 4. In 6.1 Client Generates Test Activation Request It seems some
> fields are not described, e.g., useOwDelVar，slowAdjThresh.
> 
> [Authors]: To make progress and save some time, we'd like to discuss
> this separately.
> 
> --------------
> 
> 5. In 7.1 Test Packet PDU and Roles
> I would suggest a dedicated section to describe the rate adjust
> algorithm. And you can describe the state machine and para config,
> so as to better understand the algorithm.
> 
> [Authors]: We'd suggest to add a reference, as algo B operation is
> standardised and published:
> Section 7.1, 7th paragraph CHANGE: The default algorithm (B, see
> [Y.1540])....
> 
> Cheers,
> Tianran
> 
> 

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