What Is Trunk Vlan?


Author: Lisa
Published: 24 Nov 2021

A trunk is a point-to-point link between two network devices. You can extend your configured VLAN across the entire network with the help of the VLAN trunking. The trunks on FastEthernet and GigabitEthernet used to be coordinated by theIEEE 802.1Q.

Using VLANs for Improved Performance of Multi-Hop Network

Native ports accept traffic from a single VLAN and are used to link end devices. They don't need to add an identification tag as they are involved in exchanging traffic with a single end device. The name is untagged ports.

They are referred to as access ports. The traffic from multiple VLANs is passed through the trunk ports. The performance, security and scalability of the network have been improved by the use of VLANs.

There are several reasons for using a network with a VLAN, but traffic management is the most important. The local area network branching out and proliferation of end devices and network devices increases the broadcast's frequencies. The network is more likely to get heavily congested with data.

A Custom Network

A custom network is created from one or more local area networks. A group of devices can be combined into a logical network. A virtual LAN is administered like a physical one. Virtual Local Area Network is the full form of it.

Layer 2 Traffic is Exchanged

Layer 2 traffic is carried through switch ports. A single switch port can carry single traffic. The frames are handled differently depending on the link they are traversing. If the links between switches are not trunk, then only the traffic from the configured access VLAN will be exchanged.

Native VLAN on the trunk

Do you need to allow native VLAN on the trunk? The current best practice is to not include the native VLAN in the allowed VLANs on a trunk. There is a misconception that you have a native VLAN on a trunk.

The link-local protocols that send frames without tags will work. The purpose of the Native VLAN. The native concept is to send frames that are untagged.

The Access Port

The Access port is now available. A guest Virtual machine is connected to an access port. A switch has a type of connection called a VLAN.

The access port is usually configured on a switch port that is connected to a normal network card. The frames that arrive on access ports are assumed to be part of the access network. The OSI model usually has the trunking of the involved VLANs in layer 2.

It has seven different layers for network transmissions. The data link layer is also known as Layer 2. It is used for signaling between internal networks.

The Layer 3 is used for the segmenting of the internet. The central purpose of the system is to carry traffic between switches. It helps to carry traffic from several VLANs over a point-to-point link between two devices that understand the protocol.

A Network that Only Allows Voice Traffic

It is a network that only allows voice traffic. Voice transmission is important for institutions and individuals. An internet protocol phone is used for voice transmission.

A link that only belongs to one network. The device connected to the access link is assumed to be connected to a broadcast group, even though the physical network relationships between the VLANs and the physical network are not known. Before sending the packet to the device, the switches need to remove the VLAN headers.

Virtual Private Networks

If the VLAN that is associated with a port is deleted, the port will no longer be able to communicate with the network. The show interface switchport command can be used to verify that a port is inactive. The native VLAN is used to forward untagged frames that are received on a Cisco switch.

The frames that are received on a trunk port are not forwarded to any other VLAN. The trunk links allow all the traffic from the VLAN to be sent between the switch and the server. The trunk links can be used to connect other switches.

Explanation: The benefits of using a network with a virtual private network include: security, cost reduction, and improved IT staff efficiency. Users are not usually aware of the different networks. The number of trunk links are not reduced because of the assigned access ports.

A management VLAN is used to remotely access and set up a switch. Data VLANs are used to separate a network into groups. When loading the default configuration a switch, the initial VLAN is the one that all the ports are placed in.

Virtual Extensions of Local Area Network

A custom network is created from one or more local area networks. A group of devices can be combined into a logical network. A virtual LAN is administered like a physical one.

The full form of VLAN is called a Virtual Local Area Network. A broadcast sent from a host can reach all network devices. Every device will process the broadcast received frames.

It can increase the overhead on each device. A virtual extension of the network is called a VLAN. A limited area network is a group of computers and peripheral devices that are connected to each other.

It is a network that is useful for sharing resources. There are 6 hosts on 6 switches with different VLANs. You need 6 ports to connect switches.

The VLAN 0 concept

The primary function of a VLAN is to separate traffic. Extra services are needed for hosts in one VLAN to communicate with hosts in another. A service is a routers that can send packets between the different networks.

A host assigned to a VLAN can communicate with another host on the same network. Host on a VLAN don't have to be on the same switch if they pass traffic between them. The host does not have a VLAN tag on the frames.

The switch will add the VLAN tag when the frame reaches the port. The switch port has a VLAN ID that it will put into the tag. The native VLAN is tagged on the frame when an untagged frame enters a switch port.

If switch-A sent a frame to switch-B, it would be untagged and switch-B would tag it as VLAN 20. If the frame were to be sent by switch-B, it would be labeled as VLAN 15. Special use of VLAN 0 is reserved.

When CoS is used, a client can tag a fram with a different VLAN than the native one, which causes the switch to use the native one for that traffic. The VTP concept is not a DTP concept. The actual trunk is negotiated by DTP.

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