Cisco Catalyst 3550 Command Reference Manual page 521

Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
This is an example of output from the show vlan internal usage command. It shows that VLANs 1025
and 1026 are being used as internal VLANs for Fast Ethernet routed ports 23 and 24. If you want to use
one of these VLAN IDs, you must first shut down the routed port, which releases the internal VLAN,
and then create the extended-range VLAN. When you start up the routed port, another internal VLAN
number is assigned to it.
Switch> show vlan internal usage
VLAN Usage
---- -------------
1025 FastEthernet0/23
1026 FastEthernet0/24
This is an example of output from the show vlan summary command:
Switch> show vlan summary
Number of existing VLANs
Number of existing VTP VLANs
Number of existing extended VLANs : 0
Related Commands Command
switchport mode
vlan (global
configuration)
vlan (VLAN
configuration)
OL-8566-01
: 7
: 7
Description
Configures the VLAN membership mode of a port.
Enables config-vlan mode where you can configure VLANs 1 to 4094.
Configures VLAN characteristics in the VLAN database. Only available for
normal-range VLANs (VLAN IDs 1 to 1005).
Catalyst 3550 Multilayer Switch Command Reference
show vlan
2-495