EIGRP
EIGRP is also a proprietary protocol developed by Cisco Systems. It is sometimes considered a hybrid protocol.
EIGRP provides all of the same features as IGRP, but with a few enhancements. The enhancements include:
- Improved operating efficiency: The coding of the protocol is more efficient.
- Convergence property improvement: This enhancement makes updates more efficient between routers. When topology changes occur, routers involved in the topology change can be updated simultaneously. Routers not involved in the topology change are not included in the updates to path computations.
- Network layer independence: EIGRP can support protocol suites other than TCP/IP.