How to configure DHCP and EIGRP on Cisco Router

Posted on by zed

In this configuration, we will configure three Cisco router in EIGRP. All routers will be connected to a switch on the same VLAN and will share the same subnet: 172.16.0.0/28.

R1 will be also a DHCP server and assign IP address to R2 and R3.

The EIGRP area 100 with be secure by and MD5 password.

R1 Configuration

DHCP

no ip dhcp use vrf connected
ip dhcp excluded-address 172.16.0.1
ip dhcp pool r2r3
network 172.16.0.0 255.255.255.248
default-router 172.16.0.1
domain-name zed-network.fr
ip dhcp pool R2
host 172.16.0.2 255.255.255.248
client-identifier 01cc.010c.0c00.00
default-router 172.16.0.1
ip dhcp pool R3
host 172.16.0.3 255.255.255.248
client-identifier 01cc.020c.0c00.00
default-router 172.16.0.1

EIGRP

!
interface FastEthernet0/0
 ip address 172.16.0.1 255.255.255.248
 ip authentication mode eigrp 100 md5
 ip authentication key-chain eigrp 100 cisco
 duplex auto
 speed auto
!
key chain cisco
 key 10
   key-string cisco
!
router eigrp 100
 network 172.16.0.0 0.0.0.7
 no auto-summary

R2 and R3 configuration

interface FastEthernet0/0
 ip address dhcp client-id FastEthernet0/0
 ip authentication mode eigrp 100 md5
 ip authentication key-chain eigrp 100 cisco
 duplex auto
 speed auto
!
key chain cisco
 key 10
   key-string cisco
 ip authentication key-chain eigrp 100 cisco
!
router eigrp 100
 network 172.16.0.0 0.0.0.7
 no auto-summary

Verification

R1#sh ip dhcp binding
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
                    Hardware address/
                    User name
172.16.0.2          01cc.010c.0c00.00       Infinite                Manual
172.16.0.3          01cc.020c.0c00.00       Infinite                Manual

R2#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            172.16.0.2      YES DHCP   up                    up
FastEthernet1/0            unassigned      YES unset  administratively down down

R1#sh ip eigrp neighbors
IP-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
1   172.16.0.2              Fa0/0             11 00:10:35   28   200  0  35
2   172.16.0.3              Fa0/0             13 00:11:54   80   480  0  34