Routing Information Protocol

• Uses hop count as metric

• Tables (vectors) “advertised” to neighbors every 30 s.

  • Robustness: Entries reinitialized (as 16 or infinity) if no refresh for 180 s.
  • Efficiency: Triggered updates used to inform neighbors when table changes.

• Protocol details:

  • Runs over UDP.
  • Init: send request message asking for vectors
  • Format can carry upto 25 routes (within 512 bytes)
  • RIPv1 does not carry subnet masks => many networks use default of 255.255.255.0

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