CISCO CCNA EIGRP

EIGRPin order to enhance the internal Gateway routing protocol, it can also be called the enhanced Internal Gateway routing protocol. EIGRPcombining the link state and the distance vector type routing protocolCiscoproprietary protocol using a dispersion correction algorithm (DUAL) for fast convergence, you can reduce the bandwidth footprint by not sending periodic routing update information, whileEIGRPThere are three tables: the Neighbor Relationship table (in relation to established neighbors), the topology table (the route that each router in the network receives from each neighbor), and the routing table.

EIGRP chooses a primary route (the best route) and a backup route in topology table, which supports several types of routes: internal, external (non- EIGRP), and Rollup-routing,EIGRP Use a blend measure value.

EIGRP Main Features

1. Support IP,IPX,AppleTalk via protocol related module .

2, no class.

3, support VLSM and CIDR.

4, support Summary and do not practice Xu network.

5, effective neighbors found.

6. Communication based on Reliable transport protocol (RTP).

7, the best path selection based on the dispersion update algorithm (UAL).

Advantages of EIGRP

1. Fast Convergence

EIGRP uses DUAL to achieve rapid convergence. Routers running EIGRP its system stores the neighbor's routing table, so it can quickly adapt to changes in the network. If an appropriate route is not used in the local routing table,EIGRP queries the neighbor to discover alternate routes. The query will continue to propagate across the network until an alternate route is found or an alternative route is determined to exist.

2. Partial update

EIGRP sends partial updates instead of periodic updates, and only updates when routing information changes. The update contains only the information that has changed, not the entire routing table, but only to the routers that are needed, which can reduce network bandwidth usage.

3. support multiple network layer routing protocols

EIGRP uses protocol-related modules to support IPv4,IPv6,Apple talk, and IPXto meet specific network layer requirements.

4. using multicast and unicast

EIGRP uses multicast and unicast for communication between routers, so the terminal is not affected by routing updates and queries. The multicast address used is 224.0.0.10.

5, support variable eldest son netmask

EIGRP is a class-free routing protocol that advertises the subnet mask of each target network, supporting disjoint subnets and VLSM.

6, seamlessly connect the Data Link layer protocol and topology structure.

The agreement does not require that the the OSI Reference Model's 2- layer protocol makes a special configuration.

Experimental process

topology Diagram

1, Basic configuration of the router (change the name, open the interface and configure the IP address)

1, Configure EIGRP, and announce the direct connection network.

3, look at the router's routing table, from the routing table can be seen from the R1 router to the R3 router of the route entry (the same R3 router also has to reach the R1 Router route entry).

4, test connectivity (with R1 router in privileged mode ping R3 router address), when there are 5 exclamation points, that is normal connectivity.

This experiment is done!

Chenlongchun

2018-01-03

CISCO CCNA EIGRP