Types of Links on Switches

Types of Links that can be created on a Network Switch

Video Tutorial link given at end

ACCESS LINKS

Access Links are the most common type of links on any VLAN switch. All network hosts connect to the switch's Access Links in order to gain access to the local network. These links are your ordinary ports found on every switch, but configured in a special way, so you are able to plug a computer into them and access your network.

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We must note that the 'Access Link' term describes a configured port - this means that the ports above can be configured as the second type of VLAN links - Trunk Links. What we are showing here is what's usually configured as an Access Link port in 95% of all switches. Depending on your needs, you might require to configure the first port (top left corner) as a Trunk Link, in which case, it is obviously not called a Access Link port anymore, but a Trunk Link!

When configuring ports on a switch to act as Access Links, we usually configure only one VLAN per port, that is, the VLAN our device will be allowed to access. If you recall the diagram below which was also present during the introduction of the VLAN concept, you'll see that each PC is assigned to a specific port:

TRUNK LINKS

What we've seen so far is a switch port configured to carry only one VLAN, that is, an Access Link port. There is, however, one more type of port configuration which we mentioned in the introductory section on this page - the Trunk Link.

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A Trunk Link, or 'Trunk' is a port configured to carry packets for any VLAN. These type of ports are usually found in connections between switches. These links require the ability to carry packets from all available VLANs because VLANs span over multiple switches.

The diagram below shows multiple switches connected throughout a network and the Trunk Links are marked in purple colour to help you identify them:

As you can see in our diagram, our switches connect to the network backbone via the Trunk Links. This allows all VLANs created in our network to propagate throughout the whole network. Now in the unlikely event of Trunk Link failure on one of our switches, the devices connected to that switch's ports would be isolated from the rest of the network, allowing only ports on that switch, belonging to the same VLAN, to communicate with each other.

So now that we have an idea of what Trunk Links are and their purpose, let's take a look at an actual switch to identify a possible Trunk Link:

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As we noted with the explanation of Access Link ports, the term 'Trunk Link' describes a configured port. In this case, the Gigabit ports are usually configured as Trunk Links, connecting the switch to the network backbone at the speed of 1 Gigabit, while the Access Link ports connect at 100Mbits.

In addition, we should note that for a port or link to operate as a Trunk Link, it is imperative that it runs at speeds of 100Mbit or greater. A port running at speeds of 10Mbit's cannot operate as a Trunk Link and this is logical because a Trunk Link is always used to connect to the network backbone, which must operate at speeds greater than most Access Links!

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Video Tutorial for Configuration of Trunk Link and VLANS

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