Configuring DHCP Relay on L3-Switches



In this Free CCNA Lab Packet Tracer activity we will be configuring a 3560 distribution layer switch and two 2960 access layer switches. The network is segmented into four functional subnets using VLANs for better network management. The VLANs include Sales, Service, Data-Center, and a subnet for equipment management, which is the default management VLAN, VLAN 1. After VTP and Trunking have been configured for the switches, switched virtual interfaces (SVI) are configured on the distribution layer switch to route between these VLANs, providing full connectivity to the internal network. Finally you will configure DHCP Relay to allow the PCs connected to the Sales and Service VLANs to obtain DHCP assigned IP address.

The DHCP and DNS server have already been addressed and configured with the Sales and Service address pools and the DNS information. The Sales and Service file servers are also configured.

Learning Objectives:

  • Configure EtherChannel Trunks.
  • Configure Client Server VTP.
  • Configure VLANs.
  • Configure access ports.
  • Configure SVIs.
  • Configure Inter-VLAN routing.
  • Configure DHCP Relay


Configure basic switch parameters.

  1. Configure the hostname on all routers and switched as shown in the network diagram.
  2. Configure no ip domain-lookup on all routers and switches.
  3. Configure the enable secret password as cisco on all routers and switches.
  4. Configure the console and vty password as sanfran on all routers and switches.
  5. Configure the exec-timeout command to the console and virtual terminal lines.
  6. Configure a management IP address on VLAN 1 for each of the three switches according to the diagram.
  7. Configure default gateways on the access layer switches.
  8. Save the running configuration to the NVRAM.

Configure trunks and EtherChannels between switches.

  1. Configure the trunks and EtherChannel from DLS1 to ALS1.
  2. Configure the trunks and EtherChannel from DLS1 to ALS2.
  3. Configure the trunks and EtherChannel between ALS1 and DLS1 and between ALS1 and ALS2.
  4. Configure the trunks and EtherChannel between ALS2 and DLS1 and between ALS2 and ALS1.

Configure VTP on AWS1 and AWS2 as follows:

  • Domain “CCNA”
  • Version 2
  • Password “cisco”
  • Mode Client

Configure VTP on DWS1as follows:

  • Domain “CCNA”
  • Version 2
  • Password “cisco”
  • Mode server

Create the following VLANs for the domain.

  • VLAN 30, Name Data-Center
  • VLAN 200, Name Sales
  • VLAN 200, Name Service

Configure ports.

  1. Configure the host ports for the appropriate VLANs according to the diagram.

Configure VLAN interfaces and enable routing.

  1. On DLS1, create the SVIs for VLANs 30, 100 and 200.
  2. Enable IP routing on DSW1

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