How to Configure DHCP Relay on CISCO Switch Layer 3

Hi Guys in these video we use GNS3 and show you how to configure DHCP Relay on CISCO Layer3. we use "IP Helper-address" command in cisco switch layer3.
A DHCP relay agent is any host that forwards DHCP packets between clients and servers. Relay agents are used to forward requests and replies between clients and servers
when they are not on the same physical subnet. A relay agent forwards the packets between the DHCP client and server.

Previous video about DHCP SERVER and inter-vlan routing LAB
How to configure inter VLAN routing VTP and DHCP Server on Cisco Switch Layer3    • How to configure inter VLAN routing V...  
How to configure inter VLAN routing and DHCP server on cisco router    • How to configure inter VLAN routing a...  

/configure Gateway address amd DHCP Relay for each vlan on Core-L3/
Core-L3(config)#int vlan 10
Core-L3(config-if)#ip address 192.168.10.1 255.255.255.0
Core-L3(config-if)#ip helper-address 192.168.7.254
Core-L3(config-if)#no shutdown
Core-L3(config-if)#exit
Core-L3(config)#int vlan 20
Core-L3(config-if)#ip address 192.168.20.1 255.255.255.0
Core-L3(config-if)#ip helper-address 192.168.7.254
Core-L3(config-if)#no shutdown
Core-L3(config-if)#exit
Core-L3(config)#int vlan 30
Core-L3(config-if)#ip address 192.168.30.1 255.255.255.0
Core-L3(config-if)#ip helper-address 192.168.7.254
Core-L3(config-if)#no shutdown
Core-L3(config-if)#exit
Core-L3(config)#int vlan 7
Core-L3(config-if)#ip address 192.168.7.1 255.255.255.0
Core-L3(config-if)#no shutdown
Core-L3(config-if)#exit

/Assign Access&Trunk port on Core-L3/
Core-L3(config)#int range e0/1-2
Core-L3(config-if)#switchport trunk encapsulation dot1q
Core-L3(config-if)#switchport mode trunk
Core-L3(config)#int e0/0
Core-L3(config-if)#switchport mode access
Core-L3(config-if)#switchport access vlan 7

/Enable Inter VLAN routing on core-l3/
Core-L3(config)#ip routing
Core-L3(config)#exit
=======end of Core Switch configuration==========


=========DHCP-Server Configuration===========
/Assign IP to interface e0/0/
DHCP-SVR(config)#int e0/0
DHCP-SVR(config-if)#ip address 192.168.7.254 255.255.255.0
DHCP-SVR(config-if)#no shut
DHCP-SVR(config-if)#exit

/Configure Default route to Core-L3/
DHCP-SVR(config)#ip route 0.0.0.0 0.0.0.0 192.168.7.1

/Configure DHCP Server for each VLAN/
DHCP-SVR(config)#ip dhcp pool vlan10
DHCP-SVR(dhcp-config)#network 192.168.10.0 255.255.255.0
DHCP-SVR(dhcp-config)default-router 192.168.10.1
DHCP-SVR(dhcp-config)dns-server 1.1.1.1
DHCP-SVR(dhcp-config)exit
DHCP-SVR(config)#ip dhcp pool vlan20
DHCP-SVR(dhcp-config)#network 192.168.20.0 255.255.255.0
DHCP-SVR(dhcp-config)default-router 192.168.20.1
DHCP-SVR(dhcp-config)dns-server 1.1.1.1
DHCP-SVR(dhcp-config)exit
DHCP-SVR(config)#ip dhcp pool vlan30
DHCP-SVR(dhcp-config)#network 192.168.30.0 255.255.255.0
DHCP-SVR(dhcp-config)default-router 192.168.30.1
DHCP-SVR(dhcp-config)dns-server 1.1.1.1
DHCP-SVR(dhcp-config)exit

/Configure DHCP Range for each VLAN/
DHCP-SVR(config)#ip dhcp excluded-address 192.168.10.1 192.168.10.10
DHCP-SVR(config)#ip dhcp excluded-address 192.168.20.1 192.168.20.10
DHCP-SVR(config)#ip dhcp excluded-address 192.168.30.1 192.168.30.10
=======end of DHCP Server configuration==========

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Here you can download directly from my file for GNS3 resources needed.
Windows OS image https://drive.google.com/file/d/10pxv...
CISCO Images : https://drive.google.com/drive/folder...
GNS3 for Windows : https://drive.google.com/drive/folder...
Firewall_Router : https://drive.google.com/drive/folder...
VMware WorkStation 12 : https://drive.google.com/file/d/1HZ0h...

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