[mpls] Liaison - Progress on G.8110.1 Amendment

[Stewart Bryant <stbryant at cisco.com>]

To PWE3 WG:

I have been looking at the ITU SG15 Q12 Liaison Progress on G.8110.1 
Amendment

https://datatracker.ietf.org/public/liaison_detail.cgi?detail_id=312

Here are my first thoughts on a response - which will of course be 
dressed up before they are formally sent out :)

Does anyone have any comments on these thoughts, or any other comments 
that we should make as a WG?

- Stewart


Section 3.5 Transport MPLS definition

Should be amended to make it clear TMPLS is a true subset of IETF PWE3 
over MPLS and that in the case of any differences, the IETF definition 
is considered the Normative definition.

Section 4.7.2 and A.3

The PWE3 WG is concerned that the OAM is not based on VCCV. Any true 
subset of the IETF PWE3/MPLS design should allow the use of the IETF 
preferred OAM mechanism. This does not preclude the ITU specifying an 
additional mechanism as an optional extension to enhance VCCV, although 
it would be preferable for the ITU to work with the IETF to enhance VCCV 
to provide the additional OAM mechanisms that are needed.

The PWE3 WG is not clear how you determine that the client signal is not 
present when the client is a packet service.

Do we wish to comment on Sections 8.2.3 - intrusive monitoring and 8.2.4 
Sublayer (Tandem) monitoring?

Section 4.10

– Minimize the rerouting distance (to avoid physical layer impairments 
on the signals).

We do not understand why in a well engineered network the distance in 
the virtual layer providing reroute has impact results in physical layer 
impairments

Appendix V

The introductory material to Appendix V states that it will be 
re-written at some time in the future to align with the IETF work on 
p2mp LSPs. We have therefore not reviewed this section and request that 
you resubmit this text for our review when it is aligned with the IETF 
approach.


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