Command
Network
Use
Specifies which interfaces will participate in the EIGRP process.
Syntax
Router(config-router)#network <ip address>
OR
Router(config-router)#network <ip address> <wildcard>
Example
In this example, we will configure EIGRP 100 on all routers in the topology.
R1(config)#router eigrp 100 R1(config-router)#no auto R1(config-router)#network 10.4.4.4 R1(config-router)#network 1.1.1.1 R1(config-router)#do sh run | sec eigrp router eigrp 100 network 1.0.0.0 network 10.0.0.0 no auto-summary
Notice that EIGRP also stripes the network statements back to its classful network boundary.
3(config)#router eigrp 100 R3(config-router)#no auto R3(config-router)#network 3.3.3.3 R3(config-router)#network 10.4.4.4 R3(config-router)#do sh run | sec eigrp router eigrp 100 network 3.0.0.0 network 10.0.0.0 no auto-summary
If we configure the network statement with a wildcard, we can control what interfaces are put into EIGRP.
R2(config)#router eigrp 100 R2(config-router)#no auto R2(config-router)#network 2.2.2.2 0.0.0.0 R2(config-router)#network 10.1.1.2 0.0.0.0 R2(config-router)#network 10.2.2.2 0.0.0.0 *Mar 1 00:31:25.231: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.1.1 (FastEthernet0/0) is up: new adjacency *Mar 1 00:35:35.423: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.2.2.3 (FastEthernet1/0) is up: new adjacency R2(config-router)#do sh run | sec eigrp router eigrp 100 network 2.2.2.2 0.0.0.0 network 10.1.1.2 0.0.0.0 network 10.2.2.2 0.0.0.0 no auto-summary
Notice that we have all of R1’s loopbacks in R2’s routing table.
R2(config-router)#do show ip route eigrp 1.0.0.0/32 is subnetted, 3 subnets D 1.1.1.1 [90/156160] via 10.1.1.1, 00:15:40, FastEthernet0/0 D 1.3.3.3 [90/156160] via 10.1.1.1, 00:15:40, FastEthernet0/0 D 1.2.2.2 [90/156160] via 10.1.1.1, 00:15:40, FastEthernet0/0 3.0.0.0/32 is subnetted, 1 subnets D 3.3.3.3 [90/156160] via 10.2.2.3, 00:11:33, FastEthernet1/0
Here, the running config is shown for R2. Note that the router strips the ip to the classful boundary.
R2(config)#do show run | sec router router rip version 2 network 2.0.0.0 network 10.0.0.0 no auto-summary