Subject: [mpls] New Liaison Statement, "Response to Liaison statement on clarifying Point to Multi Point (P2MP) combinations (to IETF PWE3 and MPLS WGs)"

From: Liaison Statement Management Tool <[email-masked]>
Date: Mon, 02 Dec 2013 11:16:07 -0800

Title: Response to Liaison statement on clarifying Point to Multi Point (P2MP) combinations (to IETF PWE3 and MPLS WGs)
Submission Date: 2013-11-27
URL of the IETF Web page: http://datatracker.ietf.org/liaison/1295/

From: Pseudowire Emulation Edge to Edge (Matthew Bocci <[email-masked]>)
To: ITU-T SG15 Q10, Q12 ([email-masked])
Cc: Andrew Malis <[email-masked]>,Stewart Bryant <[email-masked]>,Adrian Farrel <[email-masked]>,Pseudowire Emulation Edge to Edge Discussion List <[email-masked]>,[email-masked],[email-masked],[email-masked],[email-masked],[email-masked],[email-masked],[email-masked]
Reponse Contact: [email-masked]
Technical Contact: [email-masked]
Purpose: In response
Referenced liaison: Liaison statement on clarifying Point to Multi Point (P2MP) combinations (to IETF PWE3 and MPLS WGs) (http://datatracker.ietf.org/liaison/1274/)
Body: Attachments:	 (none)

Body:	

Thank you for your liaison of July 2013 inquiring on the valid use of p2mp pseudowires and LSPs. A new version of the Requirements and Framework for Point-to-Multipoint Pseudowires over MPLS PSNs" is available (see  http://www.ietf.org/id/draft-ietf-pwe3-p2mp-pw-requirements-06.txt) that should help to clarify the points in your liaison.

Additionally, point-to-point PWs are not intended to be used in conjunction with P2MP LSPs.  There is currently no way for the PEs terminating all of the P2MP LSP leaves to establish the applicable PW/FEC label mappings.  We do not believe that this case is supported by the PWE3 architecture.  The only use case for P2MP PWs described in the draft referenced above is when used with corresponding P2MP LSPs. Other more complex use cases are for further study. If required, participants are encouraged to bring extensions to this architecture to the PWE3 working group.

Best regards,

Matthew Bocci
Andrew Malis

IETF PWE3 Working Group Chairs
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