Table of Contents

Cisco - Switch - VLANs

NOTE: Every Cisco switch has VLAN 1 on it by default.

Check the VLANs

show vlan

returns: 

...
1    default   active     Fa0/1, Fa0/2, Fa0/3, Fa0/4
                          Fa0/5, Fa0/6, Fa0/7, Fa0/8
                          Fa0/9, Fa0/10, Fa0/11, Fa0/12
                          Fa0/13, Fa0/14, Fa0/15, Fa0/16
                          Fa0/17, Fa0/18, Fa0/19, Fa0/20
                          Fa0/21, Fa0/22, Fa0/23, Fa0/24
...

NOTE: This shows that all 24 ports are on VLAN1.

Create a new VLAN

vlan 50
exit

Assign port FA0/1-FA0/4 to that VLAN

interface range fastethernet 0/1 – 4
switchport mode access
switchport access vlan 50
exit

Check that VLAN has been configured

show vlan

returns: 

...
1    default    active    Fa0/5, Fa0/6, Fa0/7, Fa0/8
                          Fa0/9, Fa0/10, Fa0/11, Fa0/12
                          Fa0/13, Fa0/14, Fa0/15, Fa0/16
                          Fa0/17, Fa0/18, Fa0/19, Fa0/20
                          Fa0/21, Fa0/22, Fa0/23, Fa0/24
50   VLAN0020   active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
...

NOTE: This shows that ports 1-4 are now on VLAN50.

Delete VLAN

Remove assigned ports to VLAN 50. 

interface range fastethernet 0/1 – 4
switchport mode access
switchport access vlan 1

NOTE: This moves them back to VLAN 1.

Remove the VLAN

no vlan 50

Check that the VLAN has been removed

show vlan

NOTE: This should show all ports are back to VLAN 1 and VLAN 50 is deleted.