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Create Vlans

• Vlan 50

Name VLans

• name SALES

Assign Ports to Vlans

• int gi1/0/22
• switchport mode access
• switchport access vlan 50

Assign an ip address to vlan

• interface vlan 50
• ip address 10.10.10.10 255.255.255.0
• no shutdown

Note :  to assign multiple ports interface range g1/0/10-20

to avoid switchport becoming trunk port  switchport mode access

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• show vtp status 
• vtp domain abc
• vtp mode server (transparent, client)

show run command does not display the vtp info if vtp is not in transparent mode, here is the reason:

…a VLAN database was introduced into Cisco IOS Software as a method to immediately save VTP updates for VTP clients and servers. In some versions of software, this VLAN database is in the form of a separate file in NVRAM, called the vlan.dat file. You can view VTP/VLAN information that is stored in the vlan.dat file for the VTP client or VTP server if you issue the show vtp status command.

VTP server/client mode switches do not save the entire VTP/VLAN configuration to the startup config file in the NVRAM when you issue the copy running-config startup-config command on these systems. It saves the configuration in the vlan.dat file. This does not apply to systems that run as VTP transparent. VTP transparent systems save the entire VTP/VLAN configuration to the startup config file in NVRAM when you issue the copy running-config startup-config command.

Configure a trunk port

• interface g1/0/23
• switchport trunk encapsulation dot1q  (for older switches)
• switchport mode trunk
• switchport nonegeotiate

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To check Trunk or Vlan info

note:   show cdp neighbors

Show interface trunk

show int g1/0/10 trunk

show run

show vlan

show interfaces g1/0/23 switchport (to check a interface status, trunk, etc)