RFC 1294 (rfc1294) - Page 2 of 28
Multiprotocol Interconnect over Frame Relay
Alternative Format: Original Text Document
RFC 1294 Multiprotocol over Frame Relay January 1992
o May or Optional -- the item is truly optional and may be
followed or ignored according to the needs of the
implementor.
5. Introduction
The following discussion applies to those devices which serve as end
stations (DTEs) on a public or private Frame Relay network (for
example, provided by a common carrier or PTT). It will not discuss
the behavior of those stations that are considered a part of the
Frame Relay network (DCEs) other than to explain situations in which
the DTE must react.
The Frame Relay network provides a number of virtual circuits that
form the basis for connections between stations attached to the same
Frame Relay network. The resulting set of interconnected devices
forms a private Frame Relay group which may be either fully
interconnected with a complete "mesh" of virtual circuits, or only
partially interconnected. In either case, each virtual circuit is
uniquely identified at each Frame Relay interface by a Data Link
Connection Identifier (DLCI). In most circumstances DLCIs have
strictly local significance at each Frame Relay interface.
The specifications in this document are intended to apply to both
switched and permanent virtual circuits.
6. Frame Format
All protocols must encapsulate their packets within a Q.922 Annex A
frame [1,2]. Additionally, frames shall contain information
necessary to identify the protocol carried within the Protocol Data
Unit (PDU), thus allowing the receiver to properly process the
incoming packet. The format shall be as follows:
Bradley, Brown, Malis