Subject: Re: [PWE3] WG Last Call: draft-ietf-pwe3-ms-pw-arch-05.txt

From: "BUSI ITALO" <[email-masked]>
Date: Mon, 3 Nov 2008 09:30:34 +0100

Matthew,

We support the draft.

We have just few comments.

1) Page 7 - section 1.3

We think it could be useful to clarify in the PW Segment definition,
like in the SS-PW definition, that the PW Segment traverses only one PSN
tunnel in one direction.

2) Page 8 - Section 2

This paragraph is not very clear. In particular reference [23] does not
exist.

We guess it is referring to the applicability of MS-PW to MPLS-TP. 
If this is the case, it would be better to mention MPLS-TP explicitly.

Moreover at the last IETF meeting, regarding reference [6] it was stated
that "The work has been taken over by events that will serve the purpose
of the draftpurpose".

Is it needed to keep this reference? Could we refer to the JWT report
instead?

3) Page 9 - last three rows

If we understand correctly Figure 4, they should be rephrased as:
"
   from S-PE1 to T-PE2 across PSN2. PWs are used to connect the 
   attachment circuits (ACs) attached to T-PE1 to the corresponding ACs
   attached to T-PE2.  
"

4) Page 19 - section 11

In the last paragraph it is said that the QoS treatment given to a 
packet may be derived from the PSN-specific QoS flangs in the PSN 
tunnel label or PW demultiplexer.

If we understand correctly, in an MPLS PSN, this means that the QoS 
treatment may be derived either by the EXP bits in the LSP label 
stack entry or by the EXP bits in the PW label stack entry.

If our understanding is correct, we think it would be useful to clarify
in the example and rephrase:

"e.g. EXP bits in either the LSP or PW label stack entry for an MPLSPSN
or the DS field of the outer IP header for L2TPv3".

Thanks

Pietro and Italo

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On 
> Behalf Of BOCCI Matthew
> Sent: Thursday, September 25, 2008 6:57 PM
> To: [email-masked]
> Cc: [email-masked]
> Subject: [PWE3] WG Last Call: draft-ietf-pwe3-ms-pw-arch-05.txt
> 
> This is to start the 2 week WG last call for the multi-segment
> pseudowire architecture draft, draft-ietf-pwe3-ms-pw-arch-05.txt.
> 
> Note that, since Stewart and I are editors of this draft (not Stewart
> and V.Place, as erroneously shown in the notice below), we are asking
> Mark to call consensus on this one.
> 
> Regards
> 
> Matthew
> 
> > -----Original Message-----
> > From: [email-masked] [mailto:[email-masked]] On 
> > Behalf Of [email-masked]
> > Sent: 25 September 2008 17:45
> > To: [email-masked]
> > Cc: [email-masked]
> > Subject: [PWE3] I-D Action:draft-ietf-pwe3-ms-pw-arch-05.txt
> > 
> > A New Internet-Draft is available from the on-line 
> > Internet-Drafts directories.
> > This draft is a work item of the Pseudowire Emulation Edge to 
> > Edge Working Group of the IETF.
> > 
> > 
> > 	Title           : An Architecture for Multi-Segment 
> > Pseudowire Emulation Edge-to-Edge
> > 	Author(s)       : V. Place, S. Bryant
> > 	Filename        : 
> > 	Pages           : 25
> > 	Date            : 2008-09-25
> > 
> > This document describes an architecture for extending 
> > pseudowire emulation across multiple packet switched network 
> > segments. Scenarios are discussed where each segment of a 
> > given edge-to-edge emulated service spans a different 
> > provider's PSN, and where the emulated service originates and 
> > terminates on the same providers PSN, but may pass through 
> > several PSN tunnel segments in that PSN. It presents an 
> > architectural framework for such multi-segment pseudowires, defines
> > 
> > A URL for this Internet-Draft is:
> > 
> http://www.ietf.org/internet-drafts/draft-ietf-pwe3-ms-pw-arch-05.txt
> > 
> > Internet-Drafts are also available by anonymous FTP at:
> > ftp://ftp.ietf.org/internet-drafts/
> > 
> > Below is the data which will enable a MIME compliant mail 
> > reader implementation to automatically retrieve the ASCII 
> > version of the Internet-Draft.
> > 
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