In addition to the commands that were described in the previous sections, there are additional Cisco IOS software commands that are useful for both verifying and troubleshooting VLAN configurations. One of the most commonly used VLAN verification and troubleshooting commands is the show vlan command. This command displays parameters for all VLANs within the administrative domain as illustrated in the following output:
Cat-3550-1#show vlanVLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/11, Fa0/12, Fa0/13, Fa0/14
Fa0/20, Fa0/21, Fa0/22, Fa0/23
Fa0/24
150 VLAN_150 active Fa0 . . .
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