NESTOR: an architecture for network self-management andorganization
Yemini, Y.
Konstantinou, A.V.
Florissi, D.
Dept. of Comput. Sci., Columbia Univ., New York, NY;
This paper appears in: Selected Areas in Communications, IEEE Journal on
Publication Date: May 2000
Volume: 18,
Issue: 5
On page(s): 758-766
ISSN: 0733-8716
References Cited: 28
CODEN: ISACEM
INSPEC Accession Number: 6606071
Digital Object Identifier: 10.1109/49.842991
Current Version Published: 2002-08-06
Abstract
Configuration management presently requires complex
labor-intensive processes by experts. A single configuration
task-installing/reconfiguring a system, or provisioning a
service-typically involves a large number of activities fragmented among
multiple network elements, each with its own proprietary configuration
management instrumentation and tools. A change may cause configuration
inconsistencies resulting in failures or inefficiencies; undoing changes
to recover an operational state is often very difficult or even
practically impossible. Therefore, configuration management is very
costly, error prone, and often results in unpredictable failures and
costly recovery. NESTOR seeks to replace labor-intensive configuration
management with one that is automated and software-intensive.
Configuration management is automated by policy scripts that access and
manipulate respective network elements via a resource directory server
(RDS). RDS provides a uniform object-relationship model of network
resources and represents consistency in terms of constraints; it
supports atomicity and recovery of configuration change transactions,
and mechanisms to assure consistency through changes. RDS pushes
configuration changes to network elements using a layer of adapters that
translate operations on its object-relationship model to actions on
respective elements. NESTOR has been implemented in two complementary
versions and is now being applied to automate several configuration
management scenarios of increasing complexity, with encouraging results
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