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Thoughts on Address Resolution for Dual MAC FDDI Networks (RFC1329)

IP.com Disclosure Number: IPCOM000002151D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 24 page(s) / 54K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Kuehn: AUTHOR

Abstract

In this document an idea is submitted how IP and ARP can be used on inhomogeneous FDDI networks (FDDI networks with single MAC and dual MAC stations) by introducing a new protocol layer in the protocol suite of the dual MAC stations. Thus two dual MAC stations are able to do a load splitting across the two rings and use the double bandwidth of 200 Mbits/s as single MAC stations. The new layer is an extension of layer 3. For the user, the higher layer protocols, IP and ARP the property "dual MAC" is transparent. No modification is required in the protocol suite of single MAC stations and transparent bridges.

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Network Working Group P. Kuehn

Request for Comments: 1329 May 1992

Thoughts on Address Resolution for Dual MAC FDDI Networks

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard. Distribution of this memo is

unlimited.

1. Abstract

In this document an idea is submitted how IP and ARP can be used on

inhomogeneous FDDI networks (FDDI networks with single MAC and dual

MAC stations) by introducing a new protocol layer in the protocol

suite of the dual MAC stations. Thus two dual MAC stations are able

to do a load splitting across the two rings and use the double

bandwidth of 200 Mbits/s as single MAC stations. The new layer is an

extension of layer 3. For the user, the higher layer protocols, IP

and ARP the property "dual MAC" is transparent. No modification is

required in the protocol suite of single MAC stations and transparent

bridges.

2. Acknowledgements

This paper is a result of a diploma thesis prepared at the Technical

University of Munich, Lehrstuhl fuer Kommunikationsnetze, in co-

operation with the Siemens Nixdorf AG. The author would like to

thank Jrg Eberspher and Bernhard Edmaier from the university, Andreas

Thimmel and Jens Horstmeier from the SNI AG at Augsburg for the

helpful comments and discussions.

3. Conventions

Primary MAC, P-MAC MAC, placed on the primary ring

Secondary MAC, S-MAC MAC, placed on the secondary ring

Inhomogeneous ring configuration of a dual FDDI ring with

single MAC and dual MAC stations

DMARP Dual MAC Address Resolution Protocol

4. Assumptions

When a dual FDDI ring wraps, both MACs in a dual MAC station are

assumed to remain connected to the ring. ANSI is just investigating

whether the Configuration Management in the Station Management of a

FDDI station can be modified to allow this. According to the FDDI

SMT standard [1], different addresses are required for all MACs on

the primary and the secondary ring.

In this paper, the MAC in a single MAC station is assumed to reside

on the primary ring. The application of single MAC stations which

have their MAC attached to the secondary ring is not precluded, but

therefor additional connectivity between the two rings is required.

These configurations are beyond the scope of this document.

5. The Application of Transparent Bridges

Transparent bridges can provide links to other 802 LANs or further

inhomogeneous FDDI rings....