Network Measurement and Monitoring: A Sprint Perspective <draft-bhattacharyya-monitoring-sprint-01>

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Network Measurement and MonitoringA Sprint
Perspective ltdraft-bhattacharyya-monitoring-spri
nt-01gt

• Supratik Bhattacharyya
• Sprint

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Outline

• Background
• A two-level monitoring infrastructure
• Implementation issues

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Background

• Monitoring benefits
• topology design
• capacity planning and forecasting
• traffic engineering
• fault diagnosis
• customer-driven activities

• Types of data needed
• packet-level
• flow-level
• path-level
• routing
• network-element specific
• Different time-scales

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ISPs need a two-tier infrastructure

• Continuous collection
• small set of metrics
• longer time-scales
• network-wide
• On-demand collection
• fine-grained information
• short time-scales
• selected points

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Our approach to Continuous Monitoring

• Near-term
• special-purpose systems to tap link (CMon)
• summarize packet headers into flow-level data
• periodically export select set of metrics
• retain packet headers for past 24 hours (or more)
• Long-term
• migrate functionality into routers

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Implementation issues for CMon systems

• Per-packet processing at line speeds
• sampling is essential for higher speeds!
• Single system for many tasks
• Up-to-date routing information
• Explosion in flow-table size
• Information Export

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Information export design choices

• Key metrics only
• low export bandwidth but more processing on CMon
• Per-flow info
• less processing on CMon but high export bandwidth
  
• O(Mbps) for OC-48 links
• Different trade-offs possible between on-board
  computation and export bandwidth

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Relationship with IPFIX

• Our work fits well within IPFIX architecture
• flow definition, metering, data and export model,
  reliable and secure export, etc.
• need a sophisticated control protocol
• Our goal
• build system specific to operators needs
• feedback to IPFIX on lessons learned and new
  design requirements

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Further information

• http//ipmon.sprint.com
• email ipmon_at_sprintlabs.com