How to configure valn on the core switch

VLANs on a core switch are configured by creating VLAN IDs, assigning ports to VLANs, and setting up trunk ports for inter-switch communication. Step 1: Access the Switch CLIConnect to your core switch via console, SSH, or Telnet. Enter privileged EXEC mode using: CodeCopyenable Then enter global configuration mode: CodeCopyconfigure terminal Step 2: Create VLANsUse the vlan command to create VLANs and assign a name: CodeCopyvlan 10 name SALESvlan 20 name ENGINEERING This creates VLAN 10 and 20 with descriptive names.

VLAN I

Ds can range from 1–4094 depending on the switch model ( ). Step 3: Assign Ports to VLANsAssign individual switch ports to the VLANs in interface configuration mode: CodeCopyinterface FastEthernet0/1 switchport mode access switchport access vlan 10interface FastEthernet0/2 switchport mode access switchport access vlan 20 This ensures that devices connected to these ports belong to the correct VLAN ( ). Step 4: Configure Trunk PortsIf the core switch connects to other switches, configure trunk ports to carry multiple VLANs: CodeCopyinterface GigabitEthernet0/1 switchport mode trunk switchport trunk allowed vlan 10,20 Trunk ports allow VLAN traffic to pass between switches, ensuring devices in the same VLAN on different switches can communicate ( ).

Step 5: Verify VLAN ConfigurationCheck VLAN assignments and trunk status: CodeCopyshow vlan briefshow interfaces trunk These commands display all configured VLANs, their assigned ports, and trunk port details ( ). Step 6: Optional – Configure VTP (VLAN Trunking Protocol)If managing multiple switches, VTP can synchronize VLANs across switches: CodeCopyvtp mode transparentvtp domain COMPANY This ensures VLAN information is shared consistently across the network ( ).

Best Practices

Use descriptive VLAN names for clarity. Keep management VLAN separate from user VLANs.

Limit VLA

Ns on trunk ports to only those required.

Document VLAN I

Ds and port assignments for troubleshooting. By following these steps, you can segment your network efficiently, improve security, and manage traffic across your core switch and connected switches.