EIGRP used to be a Cisco-proprietary protocol which means it could be only used with cisco routers. Cisco however, in order to help companies operate in multi-vendor environment, opened up EIGRP as an open standard protocol. Some of its characteristics are:
1. Support for variable-length subnet masking (VLSM).
2. Fast converge after topology changes through its backup routes.
3. It sends routing updates if and only if there is a change in the network topology.
4. Its updates contain only the routes that have been changed and not the entire routing table.
5. Support Appletalk, IP, and IPX.
6. Using packets multicast to 224.0.0.10 to discover neighbors.
7. The updates go only to the routers that actually need them.
1. Support for variable-length subnet masking (VLSM).
2. Fast converge after topology changes through its backup routes.
3. It sends routing updates if and only if there is a change in the network topology.
4. Its updates contain only the routes that have been changed and not the entire routing table.
5. Support Appletalk, IP, and IPX.
6. Using packets multicast to 224.0.0.10 to discover neighbors.
7. The updates go only to the routers that actually need them.
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