Tal,
It is true that developing an NTP option in parallel would potentially
be more efficient and coherent; however, we have thus far had no
volunteers to work on that document. The current approach is flexible
enough to support PTP, NTP, and possibly other timing methods which is a
generalization of the solution originally proposed.
We welcome proposals and volunteer document editors who wish to pursue
the NTP option.
Regards,
Karen
On 10/22/12 4:35 PM, Tal Mizrahi wrote:
Hi Shahram,
Thanks for the prompt response.
I would suggest to add some text to explain the scope of this draft in the
context of NTP, i.e., your explanation below.
A question to the WG chairs: if NTP TCs are indeed on the agenda, wouldn't it
be best to define these entities in parallel to the MPLS draft? It seems more
natural, and more likely to produce a coherent mechanism.
Thanks,
Tal.
________________________________________
From: Shahram Davari [[email protected]]
Sent: Monday, October 22, 2012 6:46 PM
To: Tal Mizrahi; [email protected]
Cc: [email protected]; [email protected]
Subject: RE: [TICTOC] I-D Action: draft-ietf-tictoc-1588overmpls-03.txt
Hi Tal,
If you recall the Area director asked for generalizing this draft to NTP and
other possible future Timing methods such as a Shim header that can carry
Timing. I know NTP does not have TC, but IETF may add TC in future. Also on the
egress LER the timing Label (defined in the draft) may be used as an indicator
to sample ToD at the port level.
Thanks
Shahram
-----Original Message-----
From: Tal Mizrahi [mailto:[email protected]]
Sent: Monday, October 22, 2012 7:47 AM
To: [email protected]
Cc: [email protected]; [email protected]
Subject: RE: [TICTOC] I-D Action: draft-ietf-tictoc-1588overmpls-03.txt
Hi Shahram et al.
What is the motivation for adding NTP to this draft?
Are we planning to define something similar to a correctionField in NTP?
Regards,
Tal.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Monday, October 22, 2012 10:28 AM
To: [email protected]
Cc: [email protected]
Subject: [TICTOC] I-D Action: draft-ietf-tictoc-1588overmpls-03.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 Timing messages over MPLS Networks
Author(s) : Shahram Davari
Amit Oren
Manav Bhatia
Peter Roberts
Laurent Montini
Filename : draft-ietf-tictoc-1588overmpls-03.txt
Pages : 36
Date : 2012-10-22
Abstract:
This document defines the method for transporting Timing messages
such as PTP and NTP 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 Timing messages inside dedicated MPLS
LSPs. These LSPs only carry timing messages and possibly Control and
Management packets, but they do not carry customer traffic.
Two methods for transporting Timing messages over MPLS are defined.
The first method is to transport Timing messages directly over the
dedicated MPLS LSP via UDP/IP encapsulation, which is suitable for
MPLS networks. The second method is to transport Timing messages
inside a PW via Ethernet encapsulation, which is suitable for both
MPLS and MPLS-TP networks.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tictoc-1588overmpls
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-tictoc-1588overmpls-03
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-tictoc-1588overmpls-03
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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