Updating Other Routers (Distance Vectors)

• Upon initialization, each router reads its preconfigured IP address and metric (cost in hops) of all its active ports.

• Each router transmits a portion of its routing table (network ID, metric) to each “neighbor” router.

• Each router uses the most recent updates from each neighbor.

• Each router uses the update information to calculate its own “shortest path” (distance in hops) to a network.

• Tables are updated only:

  • If the received information indicates a shorter path to the destination network.
  • If the received update information indicates a network is no longer reachable.
  • If a new network is found.

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