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Efficient, Real-Time Address Resolution in Backbone Networks of General Topology

IP.com Disclosure Number: IPCOM000104086D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 8 page(s) / 371K

Publishing Venue

IBM

Related People

Doeringer, W: AUTHOR [+5]

Abstract

A Vendor Independent Network (VIN) as understood in this document provides transparent interconnection between a whole variety of networks with mutually compatible architectures and protocols. As a consequence, the syntax and semantics of the external protocols must be preserved at the points of access to a VIN. The requirements to use native external protocols become most visible in the case of directly or LAN-attached external end stations, which in general implement little flexibility with respect to the communication protocols that they can execute. This includes their native signalling procedures with the particular addressing formats.

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Efficient, Real-Time Address Resolution in Backbone Networks of General Topology

      A Vendor Independent Network (VIN) as understood in this
document provides transparent interconnection between a whole variety
of networks with mutually compatible architectures and protocols.  As
a consequence, the syntax and semantics of the external protocols
must be preserved at the points of access to a VIN.  The requirements
to use native external protocols become most visible in the case of
directly or LAN-attached external end stations, which in general
implement little flexibility with respect to the communication
protocols that they can execute.  This includes their native
signalling procedures with the particular addressing formats.  Since
such end stations typically do not implement protocols to exchange
addressing and reachability information between them even in the case
where such protocols are part of their respective network
architecture, any VIN requires some internal mechanism to map locally
signalled addresses of remote communication partners to VIN points of
access through which these partners may be reached.  To make such
directory services viable for large numbers of different external
network architectures and addressing schemes, a VIN needs to
implement a common set of directory algorithms which perform the
required mapping equally well for all attached networks.  This
invention describes the principal structure, protocols, and services
of a common, high performance, integrated directory for transparent
network interconnection over a high-speed backbone wide-area network
with group management and multicast capabilities as described and
disclosed in [3,5,9].  Such directory services may also be
implemented on other networks with corresponding features such as
documented in [8], however at the risk of insufficient performance in
a high-speed environment.  The applicability of our ideas to the
interconnection of existing networks is illustrated in several
examples.

      At this time, there are products available that implement
routing and bridging services for multiple protocols (see [1,6]  and
the cited references).  These solutions, however, do not employ
common internal routing or directory protocols but execute different
supported network protocols in parallel sharing only the installed
computing and telecommunications hardware, and are hence commonly
referred to as "multi-protocol routers".  This approach is in sharp
contrast to the invention here disclosed where external signalling
protocols are mapped to a common set of VIN internal procedures.
With respect to distributed directory architectures described in the
literature (see [15,19 or 28]) the present invention is distinguished
by its proposed u      se of multicast procedures between dynamically
established groups of VIN directory entities to efficiently scope and
navigate search procedures.  The performance of these procedures may
be further impr...