Routing Information Protocol (RIP)

• RIPv1

• • First documented in RFC 1058 in 1988
  • Before that, used in very simple form in BSD UNIX

• Uses UDP port 520 for sending and receiving

• • An ephemeral source port can be used for queries

• Packets consist of control information followed by a list of routes and their associated metrics

• Route updates normally sent every 30 seconds

• • Faster for triggered updates, but with extra delay of 1-5 seconds to avoid synchronization

• A route is timed out (metric set to infinity) if no updates are heard within 180 seconds

• • After 120 more seconds, route is deleted