EIGRP Configuration

1. EIGRP Configuration

2. 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.

3. 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.

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

5. • 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.

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

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

8. 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

9. 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.

10. • 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.

11. 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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