**DISTRIBUTION SWITCH IS THE USER GATEWAY WHICH HAVE ENABLED DHCP RELAY**

Core switch acts as DHCP Server.Connect core switch and distribution switch through Layer 3 link.

**Network Topology**

{{:ruijie:switch:switch_relay_ruijie.png?400|}}


**Configuration Tips**

1. Enable DHCP relay on distribution switch

2. Enable DHCP Service on Core switch


**Configuration Steps**

**Core switch：**

**1. Convert the port connected to distribtuion switch to L3 port and assign a IP address to it.**

Ruijie(config)#interface gigabitEthernet 0/24

Ruijie(config-if-GigabitEthernet 0/24)#no switchport

Ruijie(config-if-GigabitEthernet 0/24)#**ip address 172.16.1.1 255.255.255.252**

Ruijie(config-if-GigabitEthernet 0/24)#exit

**2. Configure a static route.**

Ruijie(config)#ip route 192.168.1.0 255.255.255.0 172.16.1.2

 

**3. Enable DHCP service**

Ruijie(config)#service dhcp        ------>DHCP service is disabled by default.

 

**4. Create DHCP pool and configure DHCP parameters ---gateway , DNS , subnets**

Ruijie(config)#ip dhcp pool vlan10

Ruijie(dhcp-config)#network 192.168.1.0 255.255.255.0      ------>Network subnet              

Ruijie(dhcp-config)#dns-server 218.85.157.99                     ------>DNS Server

Ruijie(dhcp-config)#default-router 192.168.1.254                ------>User Gateway

Ruijie(dhcp-config)#exit                                                                                                                          


**5. Save configuration**

Ruijie(config)#end

Ruijie#wr


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**Aggregation switch：**

**1. Assign IP address to Vlan 10 and SVI 10 is user gateway**

Ruijie(config)#interface vlan 10

Ruijie(config-if-VLAN 10)#ip address 192.168.1.254 255.255.255.0

Ruijie(config-if-VLAN 10)#exit

 

**2. Convert port connected to Core switch to layer 3 port and assign IP address to it**

Ruijie(config)#interface gigabitEthernet 0/24

Ruijie(config-if-GigabitEthernet 0/24)#no switchport

Ruijie(config-if-GigabitEthernet 0/24)#ip address 172.16.1.2 255.255.255.252

Ruijie(config-if-GigabitEthernet 0/24)#exit

 

**3. Configure default route**

Ruijie(config)#ip route 0.0.0.0 0.0.0.0 172.16.1.1

 

**4. Enable DHCP service**

Ruijie(config)#**service dhcp   **                                       ------>DHCP service is disabled by default

 

**5. Enable DHCP relay**

Ruijie(config)#**ip helper-address 172.16.1.1**                 ------>172.16.1.1 is the DHCP Server

 

**6. Save configuration**

Ruijie(config)#**end**

Ruijie#**wr**


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**Verification**

**1. How to display DHCP assignments**


{{:ruijie:switch:switch_relay_ruijie1.png?600|}}

**2. To display NIC information on a station，execute "run-------->cmd-------->ipconfig /all"**

{{:ruijie:switch:switch_relay_ruijie2.png?600|}}

**3. How to display status of DHCP relay**

{{:ruijie:switch:switch_relay_ruijie3.png?600|}}