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Network and Services Management

Learn about SNMP, RMON, NetFlow, MPLS & GMPLS, DiffServ, end-to-end overlay, and tools for smart network management.

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Network and Services Management

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  1. Network and Services Management Jean WalrandEECS

  2. Outline • Objectives • SNMP • RMON • NETFLOW • MPLS & GMPLS • DiffServ • End-to-End • Overlay • Tools For Smart Networks

  3. Box Management Fault Management Performance Management Network Management Network Planning Traffic Engineering Services Management Resource Allocation/Pricing Objectives

  4. Simple Network Management Protocol SNMP

  5. Protocol: GetRequest/GetNextRequest/GetResponse/SetRequest/Traps (protected) Management Information Base (MIB): OID Standardized Custom Examples: Number of interfaces Number of bytes & packets /port PER Tutorial SNMP

  6. NetFlow (Cisco) • Link • Flow: (SIP, STCP, DIP, DTCP, ToS) • Functions: • Provide detailed data collection with minimal impact on router performance and • Efficiently process access lists for packet filtering and security services • Applications: • Accounting/Billing • Network Planning and Analysis--- • Network Monitoring • Application Monitoring and Profiling • User Monitoring and Profiling • NetFlow Data Warehousing and Mining

  7. NetFlow (Cisco) (cd) • Architecture:

  8. RMON • Remote Monitoring RFC 1757 • Statistics: about subnet or network • History: Sample statistics at separate intervals • Alarms: When and how alarms are to be used • Hosts: Statistics about activity host <-> subnet • Hosts Top N: Statistics about the N highest hosts • Traffic Matrix: Traffic and error information • Filters: Specify packets or packet types to capture. • Packet Capture: How to get data from and about network history. • Events: List of all the events, or activities, created by the monitor.

  9. MPLS & GMPLS • Key Ideas: • Set up paths – Label Switching • Advantages: • Faster switching (initial idea) • Control routing; Traffic Engineering; QoS • Multi-Protocol Label Swtching • Part 2

  10. DiffServ • Key Ideas: • CoS – Per Hop Behavior (e.g., VoIP) • Hose Model (as opposed to pipe model) • Worst-Case + Overbooking

  11. DiffServ • Goal: • CoS without per-connection state • Solution: • No route-pinning • Planning and operations based on aggregate statistics and worst-case routing • Peer-to-peer SLAs that specify total rate but not traffic destination

  12. Bottleneck Link DiffServ – Worst Case CAC Ingress 3 Ingress 3 Ingress 1 Ingress 1 Ingress 2 Ingress 2 Worst Case Typical Case Terribly wasteful!

  13. New Capacity Gap Mean + 2.4s DiffServ – Measurement Based CAC Admit if peak(new) < Gap at all times

  14. End-to-End • Key Ideas: • Measure QoS with a few test packets • Abort if QoS is not acceptable • If all users do this, should be OK • Advantages: • Connections are protected • No need for CAC infrastructure • Main Issues: • Can one measure reliably end-to-end? • Assumes all users are honest • Fairness

  15. Overlay Networks

  16. Overlay Networks (cd) Tunnel with CoS • Control • CAC • Transport

  17. Public Internet Admission Controller Network Measurement Router Configuration Source Traffic Generation Performance Monitoring Sinks Tools for Smart Networks Access Gateway Switch (control) Switch (source) Switch (sink)

  18. Measurement-Based Admission Control and Provisioning for DiffServ Worst Case Measurement-Based EF from S1 to D3 1000s Tools for Smart Networks…

  19. Tools for Smart Networks … • SNT

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