This is the legacy way to view VLANs configured on a switch. While this mode is being depreciated, you will still encounter it on older switches or routers with switch modules. On newer IOS releases, use the show vlan command.
Switch(vlan)#show <changes or current or proposed>
|<changes>||Only shows changes to the VLAN database|
|<current>||Shows how the VLAN database is configured as of the last save|
|<proposed>||Shows the VLAN database, including the current changes|
In this example we will explore the differences in the various show commands. First we will add and remove a vlan on the database. Then we will try out the different show commands before we save.
Looking at show changes we see our two changes to the VLAN database.
Looking at show current, we see that VLAN 55 still exists and VLAN 70 doesn’t, This is because we haven’t saved yet.
VLAN ISL Id: 1
Media Type: Ethernet
VLAN 802.10 Id: 100001
Translational Bridged VLAN: 1002
Translational Bridged VLAN: 1003
VLAN ISL Id: 55
VLAN ISL Id: 1002
VLAN ISL Id: 1003
VLAN ISL Id: 1004
VLAN ISL Id: 1005
Finally, looking at show or show proposed, we see how the final modifiations would look. Notice that VLAN 70 exists and VLAN 55 is gone.