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Understanding Behavioral Complexity in Network Routing: Challenges and Testing Solutions

Marco Canini from EPFL presents insights on the behavioral complexity of network routing from a testing perspective at RIPE 62. He discusses how the flexibility of routing software and extensive configurability leads to extensive possible network behaviors, making it challenging to predict outcomes due to the myriad interactions among routers in a distributed, failure-prone environment. Canini emphasizes the importance of online testing to understand system behavior, improve reliability, and make routers aware of their actions, while sharing ongoing work on enhancing BGP testing.

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Understanding Behavioral Complexity in Network Routing: Challenges and Testing Solutions

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Presentation Transcript

  1. Router behavioral complexity(network complexity from a testing perspective) Marco CaniniEPFL, Switzerland Marco Canini, RIPE 62

  2. Network complexity • Behavior • Extensive range of possible behaviors • Flexibility of routing software implementations • Support for programmability to enhance functionalities • Highly expressive configuration constructs but low level of network-wide semantic • gives rise to complexity • As in a distributed system, network behavior is aggregate result of interleaved actions of many routers • Heterogeneous and failure-prone environment Marco Canini, RIPE 62

  3. Whole is sum of the parts • Difficult to reason about all possible behaviors • Unanticipated interactions of pieces of software with rather extensive behavior • Subtle differences in inter-operable router implementations • System-wide conflicts under locally admissible decisions • Seemingly valid local fault handling • Different recipes to reach the same network-design objectives • More programmability adds flexibility but extends behavioral complexity Marco Canini, RIPE 62

  4. Code, configuration and inputs drive router behavior Failures Random choices Messages Configuration changes Timeouts Code Inputs Configuration Behavior Marco Canini, RIPE 62

  5. Testing can help to manage complexity • Our vision • Harness the increases in computational power and bandwidth to improve reliability • Our goal • Use online testing to explore system behavior • Make routers aware of the consequences of their actions • Subject the routing system to many possible inputs and let things play out in isolation • Observe the system-wide impact of router actions Marco Canini, RIPE 62

  6. Exploring behavior Explore system behavior Live system Shadow snapshot 1 Shadow snapshot n Space Marco Canini, RIPE 62 Time

  7. Wrap up • Ongoing work • Online testing for BGP • Prototype built into BIRD 1.1.7 • Papers: LADIS ’10, USENIX ATC ’11 • Ultimately • Network itself would be the test platform • Come and see the full talk at the Routing WG session (Wed. at 2pm) Marco Canini, RIPE 62

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