Hi Christer,
Thank you very much for reviewing the draft in detail and for your valid 
comments.
We, the authors of the draft, will incorporate your comments.
B.R.
Weiqiang Cheng

-----邮件原件-----
发件人: Christer Holmberg [mailto:[email protected]] 
发送时间: 2017年5月17日 20:49
收件人: [email protected]; 
[email protected]
主题: Gen-ART review of draft-ietf-mpls-tp-shared-ring-protection-05.txt


I am the assigned Gen-ART reviewer for this draft. For background on Gen-ART, 
please see the FAQ at <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>

 
Document:               draft-ietf-mpls-tp-shared-ring-protection-05.txt
Reviewer:               Christer Holmberg
Review Date:            17 May 2017
IETF LC End Date:       12 May 2017
IETF Telechat Date:     N/A
 
Summary:                The document is well written, but there are a few 
issues I¹d
like the authors to address.


Major Issues: None

Minor Issues:
-------------

Section 4.1.3:

The text says:

    "When an MPLS-TP transport path, such as an LSP, enters the ring,в

The ³such as an LSP² statement is confusing. Could there be something else than 
LSP?



Section 4.4:

Would it be useful to say that, for a given ring, an interconnect node acts as 
an egress node for that ring, meaning that all LSPs using the interconnect node 
will use the same tunnel within the ring?



Section 4.4.2:

The text says:   

                  "The service LSPs that traverse the interconnected rings use 
separate
                  ring tunnels on each ring, and the LSPs on different rings are
                  stitched by the interconnection node.²

It¹s unclear to me what ³separate tunnels² mean. As there are two different 
rings, there will obviously be separate tunnels. Or, do you mean to say 
something else?



Section 5.1:

The first sentence says:

                 "The MSRP protection operation MUST be controlled with the 
help of the
                  Ring Protection Switch protocol (RPS).²

I think it would be good to have a few introduction sentences of the RPS 
protocol, before mandating the usage of it.


The text says:   

                 "The RPS protocol MUST carry the ring status information and 
RPS
                  requests, either automatically initiated or externally 
initiated,
                  between the ring nodes.²

This text is a little confusing. Is this a protocol requirement, or a protocol 
usage requirement? Similar to my previous comments, a generic introduction to 
the protocol, and the requirements it has to fulfil, would be useful. In 
addition, that text should reference to section 5.3 for the justification of 
defining a new protocol in the first place.



Editorial Issues:
-----------------

Generic:

In the document you use both ³ring node² and ³ring-node² terminology.
Unless there is a reason for that, please use consistent terminology.



Section 1:

The text says:

    "As described in [RFC5654], MPLS-TP requirements, section 2.5.6.1"

Šand later:

    "described in section 2.5.6.1 of [RFC5654]."

Please use consistent wording.



Section 3:

I like the way the section describes how the requirements have been met.
As I assume most of the solutions are described more in detail elsewhere in the 
document, I wonder whether it would be possible to add references?

Something like:

"For detailed information, see section x.x.x.x."



Section 4.1:

The text says:

   "A port can carry multiple ring tunnels, and a ring tunnel can carry 
multiple LSPs."

I think it would be good to add a picture showing a port carrying multiple ring 
tunnels, carrying multiple LSPs.







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