Browse Prior Art Database

IPv4 over MAPOS Version 1 (RFC2176)

IP.com Disclosure Number: IPCOM000002734D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 5 page(s) / 11K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Murakami: AUTHOR [+2]

Abstract

This document describes a protocol for transmission of the Internet Protocol Version 4 (IPv4) over Multiple Access Over SONET/SDH (MAPOS) version 1. MAPOS is a link layer protocol and provides multiple access capability over SONET/SDH links. IP runs on top of MAPOS. This document explains IP datagram encapsulation in HDLC frame of MAPOS, and the Address Resolution Protocol (ARP).

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 26% of the total text.

Network Working Group K. Murakami

Request for Comments: 2176 M. Maruyama

Category: Informational NTT Laboratories

June 1997

IPv4 over MAPOS Version 1

Status of this Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

Authors' Note

This memo documents a mechanism for supporting Version 4 of the

Internet Protocol (IPv4) on Version 1 of the Multiple Access Protocol

over SONET/SDH. This document is NOT the product of an IETF working

group nor is it a standards track document. It has not necessarily

benefited from the widespread and in-depth community review that

standards track documents receive.

Abstract

This document describes a protocol for transmission of the Internet

Protocol Version 4 (IPv4) over Multiple Access Over SONET/SDH (MAPOS)

version 1. MAPOS is a link layer protocol and provides multiple

access capability over SONET/SDH links. IP runs on top of MAPOS. This

document explains IP datagram encapsulation in HDLC frame of MAPOS,

and the Address Resolution Protocol (ARP).

1. Introduction

Multiple Access Protocol over SONET/SDH (MAPOS) [1] is a high-speed

link-layer protocol that provides multiple access capability over

SONET/SDH. Its frame format is based on the HDLC-like framing [2] for

PPP. A component called "Frame Switch" [1] allows multiple nodes to

be connected together in a star topology to form a LAN. Using long

haul SONET/SDH links, the nodes on such a "SONET-LAN" can span over a

wide geographical area. The Internet Protocol (IP) [3] datagrams are

transmitted in MAPOS HDLC frames [1].

This document describes a protocol for transmission of IP datagrams

over MAPOS version 1 [1]. It explains IP datagram encapsulation in

HDLC frame of MAPOS, and ARP (Address Resolution Protocol) for

mapping between IP address and HDLC address.

2. Frame Format for Encapsulating IP Datagrams

An IP datagram is transmitted in a MAPOS HDLC frame. The protocol

field of the frame must contain the value 0x0021 (hexadecimal) as

defined by the "MAPOS Version 1 Assigned Numbers" [4]. The

information field contains the IP datagram.

The information field may be one to 65,280 octets in length; the

MTU(Maximum Transmission Unit) of MAPOS is 65,280 octets. Although

the large MTU size can suppress the overhead of IP header processing,

it may cause fragmentation anywhere along the path from the source to

the destination and result in performance degradation. To cope with

the issue, Path MTU discovery [5] may be used.

3. Address Mapping

This section explains MAPOS ARP and the mapping of special addresses.

3.1 ARP cache

Each node on a MAPOS network maintains an "ARP cache" that maps

destination IP a...