Hi Manav, Thanks for incorporating most of my comments into the latest draft.
A couple points / questions. 1) In section 13 (UDP Checksum Correction), would recommend to clarify that the CF update only applies in the TC case. 2) In section 4, there is also a type "SO" -> "So" in the third sentence. 3) In section 4, there is text "Perhaps a pciture would be good here". Probably a placeholder for a future diagram. 4) In section 4, there is a comment that OC and BC would reside within LERs and TCs would reside with LSRs. Unfortunately I'm not too familiar with MPLS routing concepts. How does this fit with the comment in section 7 "PDELAY_REQ and PDELAY_RESP are exchanged between adjacent PTP clocks (i.e. Master, Slave, Boundary, or Transparent) and MAY be transported over single hop PTP LSPs.". Would it be correct to say that for PTP messages exchanged between peer-delay BC and peer-delay BC within LSRs, that a single hop PTP LSP would be used? I think this is related to section 1 where peer-to-peer boundary clocks are not listed (some folks think this mode is supported in IEEE 1588-2008, although not explicitly defined). I know ITU is considering peer-delay BCs for the distribution of time, in which case I would think the BC is within each LSR as one possible use case. Thanks, ZARLINK Semiconductor Peter Meyer Timing & Synchronization Communication Products Group Office: +1-613-270-7203 | Fax: +1-613-592-1010 [email protected] | www.zarlink.com "Bhatia, Manav (Manav)" <[email protected]> Sent by: <[email protected]> 07/10/2011 01:48 AM To "[email protected]" <[email protected]> cc Subject [TICTOC] FW: I-D Action: draft-ietf-tictoc-1588overmpls-02.txt Hi Tictocers, This version incorporates whatever comments we had recived till date. Would appreciate if the WG can review this updated version. Cheers, Manav -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, October 07, 2011 10:53 AM To: [email protected] Cc: [email protected] Subject: [TICTOC] I-D Action: draft-ietf-tictoc-1588overmpls-02.txt A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Timing over IP Connection and Transfer of Clock Working Group of the IETF. Title : Transporting PTP messages (1588) over MPLS Networks Author(s) : Shahram Davari Amit Oren Manav Bhatia Peter Roberts Laurent Montini Filename : draft-ietf-tictoc-1588overmpls-02.txt Pages : 34 Date : 2011-10-06 This document defines the method for transporting PTP messages (PDUs) over an MPLS network. The method allows for the easy identification of these PDUs at the port level to allow for port level processing of these PDUs in both LERs and LSRs. The basic idea is to transport PTP messages inside dedicated MPLS LSPs. These LSPs only carry PTP messages and possibly Control and Management packets, but they do not carry customer traffic. Two methods for transporting 1588 over MPLS are defined. The first method is to transport PTP messages directly over the dedicated MPLS LSP via UDP/IP encapsulation, which is suitable for IP/MPLS networks. The second method is to transport PTP messages inside a PW via Ethernet encapsulation, which is more suitable for MPLS-TP networks. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-tictoc-1588overmpls-02.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ This Internet-Draft can be retrieved at: ftp://ftp.ietf.org/internet-drafts/draft-ietf-tictoc-1588overmpls-02.txt _______________________________________________ TICTOC mailing list [email protected] https://www.ietf.org/mailman/listinfo/tictoc _______________________________________________ TICTOC mailing list [email protected] https://www.ietf.org/mailman/listinfo/tictoc
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