Thoughts on Address Resolution for Dual MAC FDDI Networks (RFC1329)
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2019-Feb-10
Internet Society Requests For Comment (RFCs)
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. This memo provides information for the Internet community. It does not specify an Internet standard.
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.
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.
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.
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
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
Kuehn [Page 1]
RFC 1329 Address Resolution for Dual MAC FDDI Networks May 1992
FDDI station can be modified to allow this. According to the FDDI SMT standard , 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. The connection between two inhomogeneous FDDI rings can be realized by one or two transparent bridges. When two transparent bridges are used, one transparent bridge links the primary rings, the other the secondary rings. If two secondary rings are connected by a transparent bridge, a path of transparent bridges must exist between the two primary rings. No transparent bridges are allowed between the primary and the secondary ring.
6. Protocol Layers in Single MAC Stations
The new protocol layer, named load sh...