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VLAN Port Assignment

VLANs can be assigned statically and dynamically. Static configuration is more common, but dynamic is also used.

Static VLAN assignment is like its name. You will statically assign the ports to the VLAN.

Dynamic VLAN assignment can be done by VLAN Membership Policy Server(VMPS). VMPS needs VLAN-MAC address relationship database. Here, we will use the static one, like many network engineer.

vlan(virtual local area network) port assignment

VLAN Port Assignment

There are two type port used in VLANs. These are:
– Access Ports,
– Trunk Ports

Access ports are the ports that are member of a single VLAN. Host devices are connected to it. This is also default Cisco switch port type.

Trunk ports are the ports that are member of more than one VLAN or all VLANs. This ports are used between switches. To span VLANs between more than one switch, some ports are needed to carry VLAN information accross the switches. These ports are trunk ports. You can also carry each VLAN without using any trunk port. But this way is not efficient and not common.

vlan(virtual local area network) port types, access port, trunk port

VLAN Port Types, Access Port and Trunk Ports

While carrying the frames between VLANs acroos multiple swithes, frame tagging is required. Because the other end switch need to understand that where the frame will go ( to which VLAN) on the other end. And tagging is used only for the frames going out a trunk port. This is not used for access ports, and anyway this is not necessary.

no vlan frame tagging require

No VLAN Frame Tagging Require

Think about the above figures. Here, if Host A send a frame to Host B, there is no need for VLAN frame tagging. Because they are in the same swicth. There is no need for VLAN frame tagging, for communication between Host B and Host C. They are still in the same switch. But this time, routing is required for the communcation of two different VLANs.

vlan frame tagging require

VLAN Frame Tagging Require

In this figure, for both of them, VLAN frame tagging is required. Because the communcation of Host a and Host D is between two switches. But no routing is required, they are in the same VLAN. But for the communcation between Host A and Host F, VLAN frame tagging and routing required together.

To learn mode about VLAN(Vİrtual Local Area Network)s, continue with the following posts ;)

VLAN – Part 1
VLAN – Part 2 (VLAN Assignments and VLAN Port Types)
VLAN – Part 3 (VLAN Frame Tagging Protocols, ISL and Dot1.q)
VLAN – Part 4 (How to Configure Cisco VLANs)
VLAN – Part 5 (Packet Tracer VLAN Configuration Example)




About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

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