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Hierarchical and Hypercube FDDI Rings

IP.com Disclosure Number: IPCOM000108132D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Coleman, J: AUTHOR [+2]

Abstract

Disclosed are scalable network architectures of hierarchical and hypercube fiber distributed data interface (FDDI) rings based on LightSpeed (LSP). FDDI is a standard, optical local area network (LAN) and LSP is a lightweight, hardware-oriented logical link control (LLC) designed for parallel processing and supercomputer applications. The FDDI-LSP implementation drives internetworked FDDI rings with multiple channels for achieving greater global bandwidth and greater reliability beyond a single FDDI ring.

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Hierarchical and Hypercube FDDI Rings

       Disclosed are scalable network architectures of
hierarchical and hypercube fiber distributed data interface (FDDI)
rings based on LightSpeed (LSP).  FDDI is a standard, optical local
area network (LAN) and LSP is a lightweight, hardware-oriented
logical link control (LLC) designed for parallel processing and
supercomputer applications.  The FDDI-LSP implementation drives
internetworked FDDI rings with multiple channels for achieving
greater global bandwidth and greater reliability beyond a single FDDI
ring.

      Fig. 1a shows a machine organization of two levels, 4 local
ring sets and one highway or backbone ring set.  Each ring set in
this embodiment contains 4 FDDI LANs (i.e., 4 LSP channels).  There
are a total of 20 FDDI LANs.  FDDI provides the basic media access
control layer and LSP handles all the internetwork routing -- each in
hardware. The internetworking is performed by the routing nodes which
may or may not participate in general computing.  LLC clients above
LSP perform the message striping.

      This scheme can be generalized over arbitrary configurations of
ring set sizes as well as the number of hierarchy levels.

      Fig. 1b shows a machine organization of 4-dimensional
hypercube.  Each dimension uses a separate LSP channel.  As in the
hierarchical machine, LSP handles all the internetwork routing but in
this case through intermediate nodes in the hypercube.  (Note: there
are no s...