Routing Mechanisms

3) Distance Vector Versus Link State

B) Distance Vector Protocols

3) Broken Network Example

Split Horizon

  1. concept:

    If router A pathway to router C is via B, there is not reason for A to tell B about C.

  2. simple form:

    routes timed out in error at next triggered update

  3. poisioned reverse:

    announced distance from A to B that C is at distance Infinity.

    (terminates 2-node loops)