Transmission of IP and ARP over FDDI Networks
RFC 1390
Document | Type |
RFC - Internet Standard
(January 1993; No errata)
Also known as STD 36
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Author | Dave Katz | ||
Last updated | 2013-03-02 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 1390 (Internet Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group D. Katz Request for Comments: 1390 cisco Systems, Inc. STD: 36 January 1993 Transmission of IP and ARP over FDDI Networks Status of this Memo This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract This memo defines a method of encapsulating the Internet Protocol (IP) datagrams and Address Resolution Protocol (ARP) requests and replies on Fiber Distributed Data Interface (FDDI) Networks. This RFC is the product of the IP over FDDI Working Group of the Internet Engineering Task Force (IETF). Acknowledgments This memo draws heavily in both concept and text from RFC 1042 [3], written by Jon Postel and Joyce K. Reynolds of USC/Information Sciences Institute. The author would also like to acknowledge the contributions of the IP Over FDDI Working Group of the IETF, members of ANSI ASC X3T9.5, and others in the FDDI community. Conventions The following language conventions are used in the items of specification in this document: "Must," "Shall," or "Mandatory"--the item is an absolute requirement of the specification. "Should" or "Recommended"--the item should generally be followed for all but exceptional circumstances. "May" or "Optional"--the item is truly optional and may be followed or ignored according to the needs of the implementor. Katz [Page 1] RFC 1390 IP Over FDDI January 1993 Introduction The goal of this specification is to allow compatible and interoperable implementations for transmitting IP datagrams [1] and ARP requests and replies [2]. The Fiber Distributed Data Interface (FDDI) specifications define a family of standards for Local Area Networks (LANs) that provides the Physical Layer and Media Access Control Sublayer of the Data Link Layer as defined by the ISO Open System Interconnection Reference Model (ISO/OSI). Documents are in various stages of progression toward International Standardization for Media Access Control (MAC) [4], Physical Layer Protocol (PHY) [5], Physical Layer Medium Dependent (PMD) [6], and Station Management (SMT) [7]. The family of FDDI standards corresponds to the IEEE 802 MAC layer standards [8, 9, 10]. The remainder of the Data Link Service is provided by the IEEE 802.2 Logical Link Control (LLC) service [11]. The resulting stack of services appears as follows: +-------------+ | IP/ARP | +-------------+ | 802.2 LLC | +-------------+-----+ | FDDI MAC | F | +-------------+ D S | | FDDI PHY | D M | +-------------+ I T | | FDDI PMD | | +-------------+-----+ This memo describes the use of IP and ARP in this environment. At this time, it is not necessary that the use of IP and ARP be consistent between FDDI and IEEE 802 networks, but it is the intent of this memo not to preclude Data Link Layer interoperability at such time as the standards define it. It is the explicit intent of this memo to allow the interoperability of IP and ARP between stations on FDDI networks and stations on Ethernet networks via translational bridges. The FDDI standards define both single and dual MAC stations. This document describes the use of IP and ARP on single MAC stations (single-attach or dual-attach) only. Katz [Page 2] RFC 1390 IP Over FDDI January 1993 Packet Format IP datagrams and ARP requests and replies sent on FDDI networks shall be encapsulated within the 802.2 LLC and Sub-Network Access Protocol (SNAP) [12] data link layers and the FDDI MAC and physical layers. The SNAP must be used with an Organization Code indicating that the SNAP header contains the EtherType code (as listed in Assigned Numbers [13]). 802.2 LLC Type 1 communication (which must be implemented by all conforming 802.2 stations) is used exclusively. All frames must be transmitted in standard 802.2 LLC Type 1 Unnumbered Information format, with the DSAP and the SSAP fields of the 802.2 header set to the assigned global SAP value for SNAP [11]. The 24-bit Organization Code in the SNAP must be zero, and the remaining 16 bits are the EtherType from Assigned Numbers [13] (IP = 2048, ARP = 2054). ...--------+--------+--------+ MAC Header | FDDI MACShow full document text