Re: My comment about draft-shmutzer-pals-ple

Hi Sasha,

The quality of the recovered clock will never be impacted by a PLE VPWS under the assumption that the egress PE is connected to a (common) clock in sync to the clock of the ingress PE without wander (ref. Section 3.2).

Is your concern about better documenting a case where this assumption is not valid? Or do you have any other clock distribution scenario in mind?

We are happy to discuss in more detail with you and where needed add more clarifying text in future revisions of the draft

regards
Christian

On 28.03.2023, at 02:59, Alexander Vainshtein <[email protected]<mailto:[email protected]>> wrote:

Christian and all,
My comment about the Private Line Emulation over Packet Switched Network draft<https://datatracker.ietf.org/doc/html/draft-schmutzer-pals-ple> at the PALS WG session this morning was about possibility of misleading d clock quality information that, IMH, is inherent for this proposal.

E.g., Section 1 of the draft discusses a use case about “two ethernet connected CEs and the need for synchronous ethernet operation between them without the intermediate PEs interfering or addressing concerns about ethernet control protocol transparency for carrier ethernet services”. With Synchronous Ethernet, the information about the clock quality is carried in dedicated Layer 2 Control Protocol messages. If these messages are passed transparently they would potentially mis-represent the actual quality of the recovered clock.

I think that these considerations should be explicitly discussed in the draft, probably in the (currently missing) Applicability Statement section.
My comment should not be considered as preventing adoption of the draft as a WG document.

Regards,
Sasha


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