Liaison statement
Response to Liaison statement on clarifying Point to Multi Point (P2MP) combinations (to IETF PWE3 and MPLS WGs)

Additional information about IETF liaison relationships is available on the IETF webpage and the Internet Architecture Board liaison webpage.
State Posted
Submitted Date 2013-11-27
From Group pwe3
From Contact Matthew Bocci
To Groups ITU-T-SG-15-Q10, ITU-T-SG-15-Q12
To Contacts sshew@ciena.com
Cc Andrew Malis <agmalis@gmail.com>
Stewart Bryant <stbryant@cisco.com>
Adrian Farrel <adrian@olddog.co.uk>
Pseudowire Emulation Edge to Edge Discussion List <pwe3-request@ietf.org>
swallow@cisco.com
rcallon@juniper.net
jdrake@juniper.net
Scott.Mansfield@Ericsson.com
tsbsg15@itu.int
db3546@att.com
mpls@ietf.org
Response Contact matthew.bocci@alcatel-lucent.com
Technical Contact matthew.bocci@alcatel-lucent.com
Purpose In response
Attachments (None)
Liaisons referred by this one Liaison statement on clarifying Point to Multi Point (P2MP) combinations (to IETF PWE3 and MPLS WGs)
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