VLAN Command Summary
Table 3-2 lists the commands covered in this chapter and briefly describes each command's function.
Table 3-2 VLAN Command Summary
Command |
Description |
vtp mode [server | client | transparent] |
In global configuration mode, this command sets the operational VTP mode for the switch. The default is server. |
vtp domain name |
In global configuration mode, this command assigns a VTP domain name, which allows the switch to send VTP advertisements out trunk links. The default is NULL, which would allow a switch to join the first domain it received an update from. |
show vtp status |
Displays VTP status information including configuration revision number, domain name, and switch mode. |
switchport mode [trunk | access | dynamic [desirable | auto | nonegotiate]] |
In interface configuration mode, this configures the behavior of the interface. Trunk mode will force frame tagging. Dynamic mode can become a trunk if it negotiates with the other side of the link. Access mode is a nontrunk port. |
switchport trunk encapsulation [isl | dot1q] |
Used in interface configuration mode to specify a trunking protocol. For some switches, before you can set an interface to trunk mode, you must first specify the encapsulation. |
show interface [type module/port] trunk |
Displays trunking information about the active or specified trunk links on the switch. |
show interface [type module/port] switchport |
Displays Layer 2 configuration and operational parameters of the switch. This includes VLAN membership and trunking status. |
vlan number |
In global configuration mode, this command defines a VLAN and puts the switch into VLAN configuration mode. In VLAN configuration mode, commands such as name can be used to further define the VLAN. |
show vlan [id vlan#] |
Displays VLAN information. The id option allows you to specify a particular VLAN. |
switchport access vlan [1-4096 | dynamic] |
In interface configuration mode, this command assigns an access port to a VLAN or makes it a dynamic port. |
show vlan brief |
Displays a brief table of the VLANs, including the port membership for each VLAN. |
show spanning-tree [vlan number] |
Displays Spanning Tree information for the switch or a VLAN if the vlan option is used. |