Often asked: How Trunk Port Works?

What does trunking a port mean?

In computer networking, port trunking is the use of multiple concurrent network connections to aggregate the link speed of each participating port and cable, also called link aggregation. Such high-bandwidth link groups may be used to interconnect switches or to connect high-performance servers to a network.

What is a trunk port configured for?

Sets the interface as an Ethernet trunk port. A trunk port can carry traffic in one or more VLANs on the same physical link (VLANs are based on the trunk-allowed VLANs list). By default, a trunk interface can carry traffic for all VLANs.

How do I test a trunk port?

To display the status of the trunk, determine the native VLAN used on that trunk link and verify trunk establishment using the show interfaces trunk command. The following output shows that the native VLAN on one side of the trunk link was changed to VLAN 2.

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Can a PC be connected to a trunk port?

Absolutely. Many NIC drivers have a ‘VLAN ID’ option that allows you to tell it which 802.1q VLAN number to tag outgoing frames and accept incoming tagged frames. The NIC can then be connected to switch port that sends and accepts tagged frames (a trunk ).

When would you use a trunk port?

A trunk port allows you to send all those signals for each switch or router across a single trunk link. In contrast to an access port, a trunk port must use tagging in order to allow signals to get to the correct endpoint. Trunk ports typically offer higher bandwidth and lower latency than access ports.

Do trunk ports need IP address?

The router needs to have an IP address /mask associated with each VLAN on the trunk. However, the router has only one physical interface for the link connected to the trunk.

How do you build a trunk port?

To enable trunk links, configure the ports on either end of the physical link with parallel sets of commands. To configure a switch port on one end of a trunk link, use the switchport mode trunk command.

How do I allow all VLANs on trunk port?

By default, a trunk interface can carry traffic for all VLANs. To specify that only certain VLANs are allowed on the specified trunk, use the switchport trunk allowed vlan command. If you do not configure this parameter, the trunk port uses the default VLAN as the native VLAN ID.

How do I enable VLAN on trunk port?

perform these steps: To restrict the traffic that a trunk carries, issue the switchport trunk vlan -list interface configuration command. To add a VLAN to the trunk, issue the switchport trunk allowed vlan add vlan -list command. This example shows how to remove VLANs 5 through 10 and 12.

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What does trunking mean?

Trunking is a technique used in data communications transmission systems to provide many users with access to a network by sharing multiple lines or frequencies. As the name implies, the system is like a tree with one trunk and many branches.

What is the default VTP mode?

VTP server mode – the default mode for Cisco switches. A switch operating in this mode can create, modify, and delete VLANs. You can also specify other VTP configuration parameters on a VTP server, such as VTP version and VTP pruning, for the entire VTP domain. A VTP server switch will propagate VLAN changes.

How do I remove native VLAN from trunk?

To configure the native VLAN ID for the virtual Ethernet interface, use the switchport trunk native vlan command. To remove the native VLAN ID from the virtual Ethernet interface, use the no form of this command.

Can a port be access and trunk at the same time?

The same is true with a port in access mode with any “switchport trunk ” statements. The purpose for this is usually in the use of DTP (dynamic trunking protocol). So you could configure a port as both a trunk (with “switchport trunk ” statements) and an access port (with “switchport access ” statements).

How many VLAN can be configured on a single port?

It is possible. You can have three vlans on one port if the switch configuration allows it. Mine allows one for data and one for VoIP.

How do I connect my computer to a VLAN?

Here are the steps to set a VLAN (Virtual LAN) ID on a network adapter in Windows 7: Right click on Computer > Click Properties. Click Device Manager. Expand Network Adapters. Right click on the adapter you want to set the VLAN for > Click Properties.

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