PWE3 Working Group
Internet Draft A. Malis
draft-ietf-pwe3-cell-transport-01.txt Tellabs
Expires: February 2005 L. Martini
Cisco Systems
J. Brayley
Laurel Networks, Inc.
T. Walsh
Lucent Technologies
August 2004
PWE3 ATM Transparent Cell Transport Service
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Abstract
The document describes a transparent cell transport service that
makes use of the "N-to-one" cell relay mode for PWE3 ATM cell
encapsulation described in [ATM-ENCAPS].
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [1].
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PWE3 ATM Transparent Cell Transport Service August 2004
1. Intellectual Property Statement
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2. Introduction
This transparent cell transport service allows migration of ATM
services to a PSN without having to provision the ATM subscriber or
customer edge (CE) devices. The ATM CEs will view the ATM
transparent cell transport service as if they were directly connected
via a TDM leased line. This service is most likely to be used as an
internal function in a ATM service provider's network as a way to
connect existing ATM switches via a higher speed PSN, or to provide
ATM "backhaul" services for remote access to existing ATM networks.
3. Transparent Cell Transport Definition
The transparent port service is a natural application of the "N-to-
one" cell relay mode for PWE3 ATM encapsulation described in [2].
The ATM transparent port service emulates connectivity between two
remote ATM ports. This service is useful when one desires to connect
two CEs without processing or switching at the VPC or VCC layer. The
ingress PE discards any idle/unassigned cells received from the
ingress ATM port, and maps all other received cells to a single
Pseudo Wire, using the "N-to-one" cell relay encapsulation in [2].
The egress PE doesn't change the VPI, VCI, PTI, or CLP bits when it
sends these cells on the egress ATM port. Therefore the transparent
port service appears to emulate an ATM transmission convergence layer
connection between two ports. However, since the ingress PE discards
idle/unassigned cells, this service benefits from statistical
multiplexing bandwidth savings.
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PWE3 ATM Transparent Cell Transport Service August 2004
4. Security Considerations
This draft does not introduce any new security considerations beyond
those in [2], and in [3].
5. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Martini, L., et al, "Encapsulation Methods for Transport of ATM
Cells/Frame Over IP and MPLS Networks", work in progress, draft-
ietf-pwe3-atm-encap-06.txt, July 2004.
[3] Martini, L., et al, "Pseudowire Setup and Maintenance using LDP",
work in progress, draft-ietf-pwe3-control-protocol-08.txt, July
2004.
6. Full Copyright Statement
Copyright (C) The Internet Society (2004). This document is subject
to the rights, licenses and restrictions contained in BCP 78 and
except as set forth therein, the authors retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgments
The authors would like to thank the members of the PWE3 working group
for their assistance on this draft.
Author's Addresses
Andrew G. Malis
Tellabs
90 Rio Robles Drive
San Jose, CA 95134
Email: Andy.Malis@tellabs.com
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PWE3 ATM Transparent Cell Transport Service August 2004
Luca Martini
Cisco Systems, Inc.
9155 East Nichols Avenue, Suite 400
Englewood, CO, 80112
e-mail: lmartini@cisco.com
Jeremy Brayley
Laurel Networks, Inc.
Omega Corporate Center
1300 Omega Drive
Pittsburgh, PA 15205
Email: jbrayley@laurelnetworks.com
Tom Walsh
Lucent Technologies
1 Robbins Road
Westford, MA 01886 USA
Email: tdwalsh@lucent.com
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