RE: [PWE3] question on draft-mohan-pwe3-vccv-eth-01.txt

["Andrew G. Malis" <[e-mail]>]

Peter,

Thanks for pointing that out. However, that doesn't change the 
existing charter language.

Cheers,
Andy

-------

At 3/5/2007 05:43 PM -0600, Busschbach, Peter B \(Peter\) wrote:
>Andy,
>
>I respectfully disagree. The text that I quoted says "... if the 
>pseudowire endpoints are immediately adjacent ...". Note the "s" at 
>the end of "endpoints". Therefore, the text is about adjacent PEs 
>and it says that in that case there is no need for an MPLS tunnel to 
>carry the PW. In other words, the PW can be carried directly over 
>the link layer between the adjacent PEs.
>
>Peter
>
>
>----------
>From: Andrew G. Malis [mailto:[e-mail]]
>Sent: Monday, March 05, 2007 6:33 PM
>To: Shah, Himanshu
>Cc: Busschbach, Peter B (Peter); Stewart Bryant; Mark Townsley; pwe3
>Subject: RE: [PWE3] question on draft-mohan-pwe3-vccv-eth-01.txt
>
>I would like to point out that the intent of the RFC 4447 text 
>quoted by Peter was to ONLY allow PHP to be used on the physical 
>link between the penultimate P router and the PE router where the PW 
>terminates and connects with the attachment circuit.  In this one 
>case only, the MPLS tunnel used to carry the PW terminates at the 
>penultimate P router rather than at the PE router. It was not meant 
>to be a general escape mechanism to allow the general use of PWs 
>over tunneling mechanisms other than MPLS or L2TPv3.
>
>Further, to quote the WG charter,
>
>"Pseudowire Emulation Edge to Edge (PWE3) will specify the
>encapsulation, transport, control, management, interworking and
>security of services emulated over IETF specified PSNs."
>
>Ethernet and SONET are not IETF specified PSNs.
>
>So, while there may be value in supporting PWs over 
>non-IETF-specified PSNs, I do agree with Stewart and Mark that a 
>charter change will be necessary to pursue this work.
>
>Cheers,
>Andy
>
>--------
>
>
>At 3/5/2007 05:51 PM -0500, Shah, Himanshu wrote:
>>Content-class: urn:content-classes:message
>>Content-Type: multipart/alternative;
>>         boundary="----_=_NextPart_001_01C75F78.CAA52CEF"
>>
>>I believe this is a key point.
>>In my view, discussions on in/out scope
>>really does not apply (for the reasons
>>described below). Also, note that as L2
>>technology becomes more intelligent (eg. PBT),
>>keeping it out-of-scope (artificially) would be
>>a mistake.
>>
>>There are other docs (past/present), that already
>>use this concept, such as dry martini,
>>MEF3/8 (TDM-PWoETH, except ethType is different),
>>pw-over-pbt, etc.
>>
>>IMO,
>>himanshu
>>
>>
>>-----Original Message-----
>>From: Busschbach, Peter B (Peter) [ mailto:[e-mail]]
>>Sent: Mon 3/5/2007 5:24 PM
>>To: Stewart Bryant; Mark Townsley
>>Cc: pwe3
>>Subject: RE: [PWE3] question on draft-mohan-pwe3-vccv-eth-01.txt
>>
>>Dave Allan made a point that I believe is valid and makes this whole
>>discussion irrelevant. To rephrase what he said:
>>
>>Page 4 of RFC 4447 says:
>>
>>    In the protocol specified herein, the pseudowire demultiplexor field
>>    is an MPLS label.  Thus, the packets that are transmitted from one
>>    end of the pseudowire to the other are MPLS packets, which must be
>>    transmitted through an MPLS tunnel.  However, if the pseudowire
>>    endpoints are immediately adjacent and penultimate hop popping
>>    behavior is in use, the MPLS tunnel may not be necessary.
>>
>>Based on this logic, PWs can be carried over SDH, Ethernet or any other
>>protocol that can carry MPLS packets without violating the PWE3 charter.
>>
>>Peter
>>
>>
>> > -----Original Message-----
>> > From: Stewart Bryant 
>> [<mailto:[e-mail]>mailto:[e-mail]]
>> > Sent: Monday, March 05, 2007 1:35 PM
>> > To: Mark Townsley
>> > Cc: pwe3
>> > Subject: Re: [PWE3] question on draft-mohan-pwe3-vccv-eth-01.txt
>> >
>> >
>> > So the proposal seems to be that PWE3 extends VCCV for use
>> > with a PWE3 PW over a non IP/MPLS PSN.
>> >
>> > We should put this on the agenda for Prague.
>> >
>> > - Stewart
>> >
>> >
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>> > 
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>> >
>>
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