Vlan

Vlan : Virtual Local Area Network subdivide a network into virtual LANs. Creating seperate broadcast domain.

 Access Port: An access port transports traffic to and from only the specified VLAN allotted to it

 Trunk Port: A trunk port is a port that is assigned to carry traffic for all the VLANs that are accessible by a specific switch, a process known as trunking. Trunk ports mark frames with unique identifying tags – either 802.1Q tags or Interswitch Link (ISL) tags – as they move between switches. Therefore, every single frame can be directed to its designated VLAN.

Vlan Creation:

 switch# configure terminal
switch(config)# vlan 15
switch(config)# name Test

 Access Port

 switch# configure terminal
switch(config)# interface ethernet 1/13
switch(config-if)# switchport mode access
switch(config-if)# switchport access vlan 15

 Trunk Port

 switch(config)# interface ethernet 1/14
switch(config-if)# switchport mode trunk
switch(config-if)#switchport trunk encapsulation ?
  dot1q        Interface uses only 802.1q trunking encapsulation when trunking
  isl             Interface uses only ISL trunking encapsulation when trunking
  negotiate  Device will negotiate trunking encapsulation with peer on interface

 switch(config-if)#switchport trunk encapsulation dot1q
Vlan Verification:

 switch# show vlan
switch# show vlan id 15
switch# show vlan summary

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