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Efficient Addressing Scheme for a Logically Superimposed Network

IP.com Disclosure Number: IPCOM000052968D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 3 page(s) / 49K

Publishing Venue

IBM

Related People

Schaal, WC: AUTHOR [+2]

Abstract

This article describes an addressing scheme for a communication network that can serve as a link traffic performance analyzer, a diagnostic tool and a response time measurement tool for an operational user communication network. This network, referred to as a Distributed Communication Network Management (DCNM) network, is a separate and independent network that is able to monitor a user network without disruption to it and causes minimal disruption when employed for diagnostic purposes such as problem determination.

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Efficient Addressing Scheme for a Logically Superimposed Network

This article describes an addressing scheme for a communication network that can serve as a link traffic performance analyzer, a diagnostic tool and a response time measurement tool for an operational user communication network. This network, referred to as a Distributed Communication Network Management (DCNM) network, is a separate and independent network that is able to monitor a user network without disruption to it and causes minimal disruption when employed for diagnostic purposes such as problem determination.

The link probe is an integral component of the DCNM network. For this reason, the communication discipline chosen for probe communication is Synchronous Data Link Control (SDLC). The addressing scheme defined here is compatible with this choice.

Link probes are used in conjunction with a DCNM processor to monitor and test links, modems and attached controllers and terminals in a user communication network (see drawing). Link probes are co-located with modems on a one-to-one basis. A probe and a modem may be an integral unit or they may be physically separate.

The probes are connected in a tree structure where each probe directly connected to the DCNM processor is a control probe and all remaining probes in the tree are secondary probes.

Communication for control purposes is always between the DCNM processor and a specific probe. When communicating with a secondary probe, the physical path consists of the DCNM processor to control probe link, a control probe, the links and modems belonging to the operational network and any secondary probes and node bypass connections which may be present in the physical path.

This article describes an addressing scheme based on SDLC by which the DCNM processor sends a command to a probe and the probe returns a response to the DCNM processor.

For addressing purposes, the concept of probe level is introduced. A control probe resides at level zero; the secondary probe(s) residing on the link with the control probe are on level one. A probe connected to a level one probe (using a node bypass connection) is at level two, etc. The concept permits probes to be n+l levels deep. The drawing shows a network having four levels (n=3). Only the DCNM processor is aware of the actual level on which a probe is situated. Probes assume that they are at level zero. A probe level indicator is used to facilitate this concept.

The generalized SDLC frame format for a command sent from a DCNM processor to a control probe or a response se...