Router eigrp Command on CISCO Router/Switch

Command

router eigrp <AS>

Use

The router eigrp command is necessary to enable EIGRP (Enhanced Interior Gateway Routing Protocol). EIGRP must be enabled before carrying out any of the EIGRP commands.

Syntax

R1(config)#router eigrp

Example

In this example, EIGRP is configured on R1 using router eigrp. First, we use the show ip route command to help determine the network layout.

R1#sh ip route
Codes: C – connected, S – static, R – RIP, M – mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2
i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static routeGateway of last resort is not set1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.1.0 is directly connected, FastEthernet0/0
R1#

Next router eigrp is set on R1.

R1(config)#router eigrp 101
R1(config-router)#network 10.1.1.0
R1(config-router)#exit
R1(config)#exit
R1#

Afterwards, we do the same to R2.

R2(config)#router eigrp 101
R2(config-router)#network 10.1.1.0
R2(config-router)#no router eigrp 101
R2(config-router)#exit
R2(config)#
R2#

Now if we type show ip route, we see that EIGRP is enabled and sending routes

R1#sh ip route
Codes: C – connected, S – static, R – RIP, M – mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2
i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static routeGateway of last resort is not set1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 2 subnets
D 10.2.2.0 [90/30720] via 10.1.1.2, 18:10:59, FastEthernet0/0
C 10.1.1.0 is directly connected, FastEthernet0/0
R1#

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