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VLAN, VTP, DTP, EtherCannel Cheat Sheet by

Configure VLAN

vlan <nu­mbe­r>
Creates a VLAN
name <na­me>
Sets name of a VLAN
switchport mode access vlan <nu­mbe­r>
Assigns interface to a VLAN
show vlan brief
Shows VLANs
switchport mode [access | trunk]
Sets Port to Access or Trunk

Conf­igure VTP

vtp domain <do­mai­n>
Set VTP domain
vtp password <pa­ssw­ord>
Set VTP password
vtp mode [server | client | transp­arent]
Set VTP mode to Server, Client or Transp­arent
show vtp status
Shows status of VTP
VLAN Trunking Protocol distri­butes the VLANs added to the VTP Server to all Switches in the domain. Therefore you do not have to configure every VLAN on every Switch yourself.

Configure DTP

switchport mode access
Puts the interface into permanent nontru­nking mode
switchport mode trunk
Puts the interface into permanent trunking modePuts the interface
switchport mode dynamic auto
Makes the interface able to convert the link to a trunk link (becomes trunk if neighbor is set to trunk or desirable)
switchport mode dynamic desirable
Makes the interface actively attempt to convert the link to a trunk link (becomes trunk if neighbour is trunk, desirable or dynamic auto)
switchport nonego­tiate
Prevents the interface generating DTP frames
show dtp interface <in­ter­fac­e>
Shows DTP inform­ation for an interface
debug dtp states
Shows DTP actions
Dynamic Trunking Protocol helps to negotiate if an interface is a trunk or access interface.

DTP - Negotiated Interfaces Modes


interface range F0/3 - F0/4
Configure multiple interfaces at once
channe­l-group <nu­mbe­r> mode [auto | desirable]
Adds port to EtherC­hannel with mode auto or desirable
interface port-c­hannel <nu­mbe­r>
Configure the EtherC­hannel
switchport mode trunk
Sets the interface to Trunk
switchport trunk native vlan <nu­mbe­r>
Sets the native VLAN
show etherc­hannel summary
Shows inform­ation about EtherC­hannel
An EtherC­hannel summarizes a few physical cables to one logical cable and can therefore speed up the transfer of data. It is only available for Cisco Devices.

Link Aggreg­ation

interface range F0/0 - F0/1
Configure multiple interfaces at once
switchport mode trunk
Set interface to Trunk
switchport trunk native vlan <nu­mbe­r>
Set the native VLAN
channe­l-group <nu­mbe­r> mode [active | passive]
Link Aggreg­ation is the same as EtherC­hannel but is device indepe­ndent.


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