CCNA Extra Class 05: DHCP and CDP Configuration in Cisco

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 How to Configure the DHCP Server in Cisco


Step-01: DHCP Server Configuration in Cisco Router

CoreRouter(config)#interface gigabitEthernet 0/0
CoreRouter(config-if)#ip address 172.31.0.1 255.255.255.0 
CoreRouter(config-if)#no shutdown 

CoreRouter(config)#ip dhcp pool LAN_POOL 
CoreRouter(dhcp-config)#domain-name xyz.com 
CoreRouter(dhcp-config)#network 172.31.0.0 255.255.255.0
CoreRouter(dhcp-config)#default-router 172.31.0.1 
CoreRouter(dhcp-config)#dns-server 172.31.0.1 

CoreRouter(config)#ip dhcp excluded-address 172.31.0.1 172.31.0.10
CoreRouter(config)#ip dhcp excluded-address 172.31.0.254



Step-02: DHCP Client Configuration in Cisco Router

ClientRouter(config)#interface fastEthernet 0/0
ClientRouter(config)#no shutdown
ClientRouter(config)#ip address dhcp

ClientRouter#show ip interface brief

Step-03: Check the Configuration

CoreRouter#show ip dhcp pool



CoreRouter#show ip dhcp binding


N:B: Every nodes getting the IP addresses from DHCP server. 

How to Configure DHCP Server as Per VLAN

Step-01: Configure the DHCP Server as Per VLAN

Router(config)#interface gigabitEthernet 0/0/0
Router(config-if)#no shutdown 
Router(config-if)#exit
Router(config)#interface gigabitEthernet 0/0/0.100
Router(config-subif)#encapsulation dot1Q 100
Router(config-subif)#ip address 10.10.10.1 255.255.255.0
Router(config-subif)#no shutdown 
Router(config)#interface gigabitEthernet 0/0/0.200
Router(config-subif)#encapsulation dot1Q 200
Router(config-subif)#ip address 10.10.20.1 255.255.255.0
Router(config-subif)#no  shutdown 
Router(config)#interface gigabitEthernet 0/0/0.99
Router(config-subif)#encapsulation dot1Q 99
Router(config-subif)#ip address 10.10.99.1 255.255.255.0
Router(config-subif)#no shutdown 

Router#conf t
Router(config)#ip dhcp pool pool100 
Router(dhcp-config)#default-router 10.10.10.1 
Router(dhcp-config)#dns-server 10.10.10.1
Router(dhcp-config)#domain-name 100.com
Router(dhcp-config)#network 10.10.10.0 255.255.255.0
Router(dhcp-config)#exit
Router(config)#ip dhcp excluded-address 10.10.10.1 10.10.10.20


Router(config)#ip dhcp Pool pool200
Router(dhcp-config)#default-router 10.10.20.1
Router(dhcp-config)#domain-name 200.com
Router(dhcp-config)#dns-server 10.10.20.1
Router(dhcp-config)#network 10.10.20.0 255.255.255.0
Router(config)#ip dhcp excluded-address 10.10.20.1 10.10.20.20
Router#copy running-config startup-config

Step-02: Verify the DHCP Configuration



How to Configure CDP in Cisco

ClientRouter(config)#interface fastEthernet 0/0
ClientRouter(config-if)#cdp enable
ClientRouter(config)#cdp run

ClientRouter#show cdp neighbors
ClientRouter#show cdp interface
ClientRouter#show cdp entry


N:B: Configure to All cisco devices upper commands








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