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USENIX, The Advanced Computing Systems Association

2007 USENIX Annual Technical Conference

Pp. 7386 of the Proceedings

Configuration Management at Massive Scale: System Design and Experience

William Enck and Patrick McDaniel, Pennsylvania State University; Subhabrata Sen, Panagiotis Sebos, and Sylke Spoerel, AT&T Research; Albert Greenberg, Microsoft Research; Sanjay Rao, Purdue University; William Aiello, University of British Columbia

Abstract

The development and maintenance of network device configurations is one of the central challenges faced by large network providers. Current network management systems fail to meet this challenge primarily because of their inability to adapt to rapidly evolving customer and provider-network needs, and because of mismatches between the conceptual models of the tools and the services they must support. In this paper, we present the PRESTO configuration management system that attempts to address these failings in a comprehensive and flexible way. Developed for and deployed over the last 4 years within a large ISP network, PRESTO constructs device-native configurations based on the composition of configlets representing different services or service options. Configlets are compiled by extracting and manipulating data from external systems as directed by the PRESTO configuration scripting and template language. We outline the configuration management needs of large-scale network providers, introduce the PRESTO system and configuration language, and demonstrate the use, workflows, and ultimately the platform's flexibility via an example of VPN service. We conclude by considering future work and reflect on the operators' experiences with PRESTO.
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Last changed: 29 August 2007 ac