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        RFC 3437

        Title:      Layer-Two Tunneling Protocol Extensions for PPP
                    Link Control Protocol Negotiation
        Author(s):  W. Palter, W. Townsley
        Status:     Standards Track
        Date:       December 2002
        Mailbox:    mark@townsley.net, palter.ietf@zev.net
        Pages:      10
        Characters: 20820
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-ietf-l2tpext-link-07.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3437.txt

This document defines extensions to the Layer Two Tunneling Protocol
(L2TP) for enhanced support of link-specific Point to Point Protocol
(PPP) options.  PPP endpoints typically have direct access to the
common physical media connecting them and thus have detailed knowledge
about the media that is in use.  When the L2TP is used, the two PPP
peers are no longer directly connected over the same physical media.
Instead, L2TP inserts a virtual connection over some or all of the PPP
connection by tunneling PPP frames over a packet switched network such
as IP.  Under some conditions, an L2TP endpoint may need to negotiate
PPP Link Control Protocol (LCP) options at a location which may not
have access to all of the media information necessary for proper
participation in the LCP negotiation.  This document provides a
mechanism for communicating desired LCP options between L2TP endpoints
in advance of PPP LCP negotiation at the far end of an L2TP tunnel, as
well as a mechanism for communicating the negotiated LCP options back
to where the native PPP link resides.

This document is a product of the Layer Two Tunneling Protocol
Extensions Working Group of the IETF.

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol.  Distribution
of this memo is unlimited.

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