EIGRP Configuration

Configuring EIGRP 1

• EIGRP configuration closely resembles RIP configuration. Only two steps are required:•    enabling EIGRP by using the router eigrp

ASN_NUMBER command•    telling EIGRP which networks to advertise by using one or

more network statements • The first command, router eigrp ASN_NUMBER, enables EIGRP

on a router. ASN_NUMBERrepresents an autonomous system number and has to be the same on all routers running EIGRP, otherwise routers won't become neighbors. The second command, network SUBNET, enables EIGRP on selected interfaces and specifies which networks will be advertised. By default, the network command takes a classful network number as the parameter.

To illustrate a configuration of EIGRP, we will use the following figure:

The network depicted above consists of only two routers. Each router has a directly connected subnet that needs to be advertised through EIGRP.

• The following figure show the EIGRP configuration on R1 and R2:

• You can verify that routers have become neighbors by using the show ip eigrp neighbors command on either router:

• The command above lists all EIGRP neighbors. The address field lists the neighboring router RID (router ID). The interface field shows on which local interface the neighbor relationship has been formed.

• You can verify that routes are indeed being exchanged by using the show ip route command on both routers:

• NOTE - the "D" character at the beginning of a line in a routing table indicates that the route has been learned via EIGRP.

Configuring EIGRP 2

• By default, the network command uses a classful network as the parameter.

• All interfaces inside that classful network will participate in an EIGRP process.

• To enable EIGRP only on specific interfaces, a wildcard mask can be used.

• The syntax of the command is:(router-eigrp) network WILDCARD_MASK

Consider the following example.

• Router R1 has two directly connected subnets, 10.0.0.0/24 and 10.0.1.0/24. We want to enable EIGRP only on the subnet connected to the interface Fa0/0. If we enter the network 10.0.0.0 command under the EIGRP configuration mode, both subnets will be included in EIGRP process because we've used a classful network number in the network command.

• To configure EIGRP only on interface Fa0/0, the network 10.0.0.0 0.0.0.255 command can be used. This will enable EIGRP only on interfaces starting with  10.0.0.X.

By using the command show ip protocols, you can verify that only network 10.0.0.0/24 is included in  EIGRP:

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