Well, you need to signal protocol type as well as offset which
complicates the P nodes because of the different formats, whereas if you
just have the correction field immediately after the BoS followed by the
opaque payload, the P nodes can use a canonical time format and the
correction can be applied in the PEs.
Stewart
On 01/02/2011 19:37, Shahram Davari wrote:
Hi Stewart,
I think with our mechanism you can support NTP as well. NTP does not need TC
processing and only needs Transmit and Receive timestamps, which are local to
the LSP ingress and Egress nodes. The UDP port number for NTP is different from
PTP and therefore no TC processing will be applied to NTP packets.
So our mechanism could be generalized to NTP a well. The co-routed symmetry is
needed for both NTP and PTP. The PTP label is needed for the LSP egress node
(for both NTP and PTP) to sample the timestamp.
Thx
Shahram
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Stewart Bryant
Sent: Tuesday, February 01, 2011 9:48 AM
To: [email protected]
Subject: Re: [TICTOC] Transporting PTP messages (1588) over MPLS Networks
On 01/02/2011 15:52, Bhatia, Manav (Manav) wrote:
Hi Yakov,
And I still stand by what I said earlier that I don't think NTP needs to be
included here. I'd rather that we keep NTP and 1588 separate and only merge
them if we think its absolutely essential that a common uniform solution is
developed for the two protocols.
Manav
It is the normal practice of the IETF to design a single common
mechanism for a problem, so you need to justify why we need to develop a
special purpose protocol rather than develop for instance a time
correction protocol.
It would be better in my view to design a correction mechanism that sits
as preamble to an opaque payload and then fix up the timing packet in
the Timing equivalent of a PW NSP. That would work for any protocol that
needed time of flight correction.
Stewart
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