VLAN Configuration without Inter-VLAN Routing for Internet Access on Cisco Catalyst 3850 Switch with TP-Link AX20 and Asus RT-N12 Routers

Introduction

In this article, we will discuss how to configure multiple VLANs on a Cisco Catalyst 3850 switch and connect them to the internet using TP-Link AX20 and Asus RT-N12 routers without inter-VLAN routing. This setup is useful for creating isolated networks where you want to prevent traffic between VLANs.

Prerequisites

Before we begin, ensure the following:

• Two or more VLANs are configured on the Cisco Catalyst 3850 switch.
• TP-Link AX20 or Asus RT-N12 routers are connected to the switch.
• The switch, routers, and computers are connected to their respective networks.

Configuring VLANs on Cisco Catalyst 3850 Switch

To configure VLANs on a Cisco Catalyst 3850 switch, follow these steps:

1. Enter global configuration mode:

switch# configure terminal

2. Create VLANs:

switch(config)# vlan 

3. Name the VLAN:

switch(config-vlan)# name 

4. Exit configuration mode:

switch# end

Configuring Access Ports on Cisco Catalyst 3850 Switch

To configure access ports on a Cisco Catalyst 3850 switch, follow these steps:

1. Enter interface configuration mode:

switch# configure terminal

switch(config)# interface 

2. Set the interface mode to access:

switch(config-if)# switchport mode access

3. Assign the VLAN:

switch(config-if)# switchport access vlan 

4. Exit configuration mode:

switch# end

Configuring TP-Link AX20 or Asus RT-N12 Routers as Access Points

To configure TP-Link AX20 or Asus RT-N12 routers as access points, follow these steps:

1. Connect the router to the switch:

TP-Link/Asus # Connect one of the LAN ports to a switch port

2. Enter the router's web interface:

TP-Link/Asus > Open a web browser and enter the router's IP address (usually 192.168.0.1)

3. Configure the router as an access point:
• Go to the "Wireless" tab and click "WDS"
• Click "Add" and enter the MAC address of the switch port
• Set the WDS mode to "AP"
• Click "Save & Apply"

Connecting Computers to the Isolated Networks

To connect computers to the isolated networks, follow these steps:

1. Connect the computer to the TP-Link AX20 or Asus RT-N12 router:

Computer # Connect to one of the LAN ports on the router

2. Configure the computer's IP address:

Computer > Configure the IP address manually with an IP address within the VLAN's subnet and default gateway as the router's IP address

In this article, we learned how to configure multiple VLANs on a Cisco Catalyst 3850 switch and connect them to the internet using TP-Link AX20 and Asus RT-N12 routers without inter-VLAN routing. We discussed how to create VLANs, configure access ports, and set up the routers as access points. By following these steps, you can create isolated networks where traffic between VLANs is prevented.