RFC 3301 (rfc3301) - Page 2 of 19
Layer Two Tunnelling Protocol (L2TP): ATM access network extensions
Alternative Format: Original Text Document
RFC 3301 L2TP: ATM access network extensions June 2002
3.4 Framing ...................................................... 6
4. Service model issues .......................................... 7
4.1 Authentication ............................................... 7
4.2 Authorization ................................................ 7
5. New and extended AVPs ......................................... 7
5.1 New AVP Summary .............................................. 7
5.2 New AVP definition ........................................... 8
5.3 Changed AVP Definition ....................................... 12
6. IANA considerations ........................................... 16
7. Security considerations ....................................... 17
8. Acknowledgements .............................................. 17
9. References .................................................... 17
10. Authors Addresses ............................................ 18
11. Full Copyright Statement ..................................... 19
1. Introduction
L2TP [RFC 2661] defines the procedures for tunneling PPP sessions
between a so called L2TP Access Concentrator (LAC) and an L2TP
Network Server (LNS). The main focus of [RFC 2661] is on supporting
HDLC based ISDN/PSTN access networks.
This document augments the procedures described in [RFC 2661] to
further support ATM SVC or PVC based access networks. Support for
ATM access networks requires extensions to the present L2TP
procedures so as to cope with :
(a) the traffic management aspects of ATM connections (e.g.
asymmetric bandwidth allocation and service category selection
capabilities),
(b) the addressing format to be used in switched ATM networks [AESA]
and
(c) the limitations imposed on LCP negotiation by transporting PPP
over AAL5 over the access network segment of the PPP connection
[RFC 2364].
Within this document, the necessary extensions to [RFC 2661] are
defined to cope with issues (a) and (b), issue (c) which is not
specific to ATM may be solved as described in [L2TP_link].
1.1 Conventions
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].
T'Joens, et al. Standards Track