Subject: FW: I-D ACTION:draft-ietf-pwe3-cesopsn-02.txt

From: Sasha Vainshtein <[email-masked]>
Date: Tue, 1 Feb 2005 09:38:22 +0200

Stewart, Danny and all,
I've updated the CESoPSN draft in order to resolve the
UDP usage issue mentioned in the latest PWE3 status report
as a gate towards sending the draft to the IESG.

The difference between the old and new UDP usage fragmens
is shown below:

<---The UDP usage fragment from the -01 draft starts--->
Usage of UDP as the multiplexing mechanism is compliant with the 
traditional method used for multiplexing RTP flows, e.g.: 
 
1. Each PE: 
    a) Allocates one of the PE own IP addresses and a single UDP port 
       for each local PW end point (CESoPSN IWF instance)  
    b) Is aware (by configuration or via a signaling protocol) of the 
       similar allocations associated with the remote peer PW end 
       points 
2. Each CESoPSN IWF instance uses the associated locally and remotely 
    allocated UDP ports as correspondingly the Source and Destination 
    UDP ports in all the CESoPSN packets its generates. 
<---The UDP usage fragment from the -01 draft ends---->

<---The UDP usage fragment from the -02 draft starts--->
UDP as the multiplexing mechanism for PWs SHOULD be used with manual 
configuration of both source and destination UDP ports. 
 
In addition, CESoPSN assumes that UDP-based demultiplexing is aligned 
with traditional demultiplexing of peer-to-peer applications, i.e.: 
 
1. Each CESoPSN IWF instance is associated with ("local association"): 
    a) One of the routable IP addresses of its containing PE. This IP 
       address is treated as the local end-point of the PSN tunnel  
    b) A unique (within the scope defined by this address) UDP port 
       number that is used as the local demultiplexor of the CESoPSN PW 
       packets within the corresponding PSN tunnel 
2. Each CESoPSN IWF instance is aware (e.g., by configuration) of the 
    similar association of its remote peer ("remote association") and, 
    in each packet it generates, uses: 
    a) The IP address and the UDP port number of its "remote" 
       association as correspondingly the Destination IP address and 
       UDP port  
    b) The IP address and the UDP port number of its "local" 
       association as correspondingly the Source IP address and UDP 
       port.
<---The UDP usage fragment from the -02 draft ends---->

In addition, the references o other Internet-Drafts have been updated, the
latest IPR disclosure boilerplate used, and, of course, the revision number 
and posting/epiration dates have been advanced.

If you think that an additional WG Last Call on these changes is required,
please announce it immediately. Otherwise IMO the draft could be sent to
the IESG now.

Regards,
                                  Sasha Vainshtein
email:                         [email-masked] <mailto:[email-masked]> 
phone:                       +972-3-7569993 (office)
fax:                            +972-3-6487779
mobile:                      +972-52-8674833 

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]]
> Sent: Monday, January 31, 2005 10:46 PM
> To: [email-masked]
> Cc: [email-masked]
> Subject: I-D ACTION:draft-ietf-pwe3-cesopsn-02.txt
> 
> 
> A New Internet-Draft is available from the on-line 
> Internet-Drafts directories.
> This draft is a work item of the Pseudo Wire Emulation Edge 
> to Edge Working Group of the IETF.
> 
> 	Title		: Structure-aware TDM Circuit Emulation 
> Service over 
> 			  Packet Switched Network (CESoPSN)
> 	Author(s)	: S. Vainshtein, et al.
> 	Filename	: draft-ietf-pwe3-cesopsn-02.txt
> 	Pages		: 29
> 	Date		: 2005-1-31
> 	
> This document describes a method for encapsulating structured (NxDS0) 
> TDM signals as pseudo-wires over packet-switching networks (PSN). In 
> this regard, it complements similar work for structure-agnostic 
> emulation of TDM bit-streams [PWE3-SAToP].
> 
> A URL for this Internet-Draft is:
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