Internet Routing
Routing Information Protocol:
- Distance vector protocol.
- Hop count metric
- Exchange is done every 30 seconds, fault detection every 180 seconds.
- Cheap and easy to implement, unstable in the presence of faults.
Open Shortest Path First:
- Link state protocol.
- Internal hierarchy for better scaling.
- Optimization for broadcast LANs with routers on them. (A designated router represents the whole LAN) - Saves control messages and size.