Network Working Group A. Fuqua
Request for Comments: 2043 IBM
Category: Standards Track October 1996
The PPP SNA Control Protocol (SNACP)
Status of this Memo
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.
Abstract
The Point-to-Point Protocol (PPP) [1] provides a standard method for
transporting multi-protocol datagrams over point-to-point links. PPP
defines an extensible Link Control Protocol, and proposes a family of
Network Control Protocols for establishing and configuring different
network-layer protocols.
This document defines the Network Control Protocols for establishing
and configuring Systems Network Architecture (SNA) over PPP and SNA
over LLC 802.2 over PPP.
Table of Contents
1. Introduction .......................................... 2
1.1 Specification of Requirements ................... 2
1.2 Terminology ..................................... 3
2. A PPP Network Control Protocol for SNA ................ 4
3. Sending SNA PIUs and NLPs. ............................ 5
3.1 Sending SNA XID or FID2 PIUs over LLC ........... 5
3.2 Sending HPR Network Layer Packets (NLPs) ........ 5
3.3 Other Considerations ............................ 6
SECURITY CONSIDERATIONS ...................................... 6
REFERENCES ................................................... 6
ACKNOWLEDGEMENTS... .......................................... 7
CHAIR'S ADDRESS .............................................. 7
AUTHOR'S ADDRESS ............................................. 7
Fuqua Standards Track [Page 1]RFC 2043 PPP SNACP October 19961. Introduction
PPP has three main components:
1. A method for encapsulating multi-protocol datagrams.
2. A Link Control Protocol (LCP) for establishing, configuring,
and testing the data-link connection.
3. A family of Network Control Protocols for establishing and
configuring different network-layer protocols.
In order to establish communications over a point-to-point link, each
end of the PPP link must first send LCP packets to configure and test
the data link. After the link has been established and optional
facilities have been negotiated as needed by the LCP, PPP must send
SNACP packets to choose and configure the SNA network-layer protocol.
Once SNACP has reached the Opened state, SNA datagrams can be sent
over the link.
The link will remain configured for communications until explicit LCP
or SNACP packets close the link down, or until some external event
occurs (an inactivity timer expires or network administrator
intervention).
1.1. Specification of Requirements
In this document, several words are used to signify the requirements
of the specification. These words are often capitalized.
MUST This word, or the adjective "required", means that the
definition is an absolute requirement of the specification.
MUST NOT This phrase means that the definition is an absolute
prohibition of the specification.
SHOULD This word, or the adjective "recommended", means that there
may exist valid reasons in particular circumstances to
ignore this item, but the full implications must be
understood and carefully weighed before choosing a
different course.
MAY This word, or the adjective "optional", means that this
item is one of an allowed set of alternatives. An
implementation which does not include this option MUST be
prepared to interoperate with another implementation which
does include the option.
Fuqua Standards Track [Page 2]RFC 2043 PPP SNACP October 19961.2. Terminology
This document frequently uses the following terms:
datagram The unit of transmission in the network layer (such as IP).
A datagram may be encapsulated in one or more packets
passed to the data link layer.
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