VLAN Trunking

In Cisco Packet Tracer, a trunk is a type of network link that carries traffic for multiple VLANs (Virtual Local Area Networks) simultaneously. Trunks are used to connect switches or other network devices, allowing the transmission of VLAN-tagged frames between them.

To use a trunk in Cisco Packet Tracer, follow these steps:

Step 1: Build the network topology Create the network topology by adding the switches or devices you want to connect using a trunk link. Ensure that the devices are properly interconnected with appropriate interfaces.

Step 2: Configure VLANs Configure the VLANs on each switch by accessing the switch's CLI (Command Line Interface). Enter the following commands:

enable

configure terminal

vlan vlan-id

name vlan-name

Replace vlan-id with the desired VLAN ID (e.g., 10, 20, etc.) and vlan-name with a descriptive name for the VLAN.

Repeat these commands for each VLAN you want to create on the switches.

Step 3: Enable trunking on interfaces Access the CLI of the interfaces that will be used for the trunk link. Enter the following commands:

enable

configure terminal

interface interface-type interface-number

switchport mode trunk

Replace interface-type with the appropriate interface type (e.g., FastEthernet, GigabitEthernet) and interface-number with the interface number (e.g., 0/1, 1/1) that will be configured as a trunk link.

Step 4: Allow VLANs on the trunk link To allow specific VLANs on the trunk link, enter the following command in the interface configuration mode:

switchport trunk allowed vlan vlan-list

Replace vlan-list with a comma-separated list of the VLAN IDs that you want to allow on the trunk link.

Step 5: Save and exit Save the configurations on each switch and exit the CLI.

Once the trunk link is configured, it will carry traffic for the allowed VLANs between the switches or devices. The devices connected to the trunk link can communicate with each other using the respective VLANs.

Note that Packet Tracer is a simulation tool, and the steps provided here may vary slightly in a real-world network environment. Additionally, the commands may differ based on the switch models used. It's always recommended to consult the specific documentation or configuration guides for the switches you are working with to ensure accurate configuration.

How to trunk on any network:

To configure trunking on a Cisco switch, the correct commands would be:

ena

conf t

interface FastEthernet0/1          // Replace this with appropiate interface that you want to trunk!

switchport mode trunk

Please note that the specific interface and device names may vary depending on your network setup. Ensure you replace "FastEthernet0/1" with the appropriate interface name that you want to configure as a trunk.