Is it possible to delete an interface

Routing & Switching Switching
1

If there is no VLAN database on a switch and an admin enters interface configuration mode and enters the following:

Switch(config)#int f0/13
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 13
% Access VLAN does not exist. Creating vlan 13

If the VLAN database is configured on a switch and contains VLAN 10, and int f0/13 is configured to belong to VLAN 10, explain what happens on int f0/13 and VLAN 10 if the admin deletes VLAN 10 from the database?

I am just really confused with what happened to the interface. When I ran the first set of commands VLAN 13 was created and the interface belonged to VLAN 13. then after creating a VLAN database and assigning the interface f0/13 to it, the interface belonged to the VLAN I created.
Now after deleting the VLAN created the interface disappeared, I ran the " show vlan" command, and I couldn’t see the interface f0/13. It didn’t go back to VLAN 13 or the native VLAN. I’m just really confused about what happened to the interface and how come it’s not showing up in the VLAN database.

2

When you remove a VLAN, all interfaces assigned to that VLAN will not be assigned to anything. They don’t “return” to VLAN 1. Here’s an example:

Switch(config)#interface GigabitEthernet 0/1
Switch(config-if)#switchport access vlan 100
% Access VLAN does not exist. Creating vlan 100

Let’s verify the VLAN assignment:

Switch#show vlan | include Gi0/1
100  VLAN0100                         active    Gi0/1

Switch#show interfaces Gi0/1 switchport | include Access
Access Mode VLAN: 100 (VLAN0100)

Above we can see Gi0/1 is in VLAN 100. Let’s delete VLAN 100:

Switch(config)#no vlan 100

It won’t show up anymore in the show vlan overview:

Switch#show vlan | include Gi0/1

When you look at the switchport info we can see something else:

Switch#show interfaces Gi0/1 switchport | include Access
Access Mode VLAN: 100 (Inactive)

Here it shows up as inactive so we know that the interface is unusable now.

Hope this helps.

Rene