Quick Answer: What Is Trunk Port?

Can we connect PC to trunk port?

Yes, of course.

You configure it like a normal trunk.

If the PC on the other side doesn’t support VLANs, you will be able to sniff traffic with Wireshark but not to communicate.

If the NIC supports VLAN, you can even have an IP in each VLAN and even do routing..

Can a switch port be access and trunk?

When the port is in trunk mode, then any “switchport access” statements are not used. The same is true with a port in access mode with any “switchport trunk” statements. … So you could configure a port as both a trunk (with “switchport trunk” statements) and an access port (with “switchport access” statements).

How do I test a trunk port?

Use the show interfaces trunk command to check whether a trunk has been established between switches. Statically configure trunk links whenever possible. Cisco Catalyst switch ports use DTP by default and attempt to negotiate a trunk link.

What is VLAN how it works?

A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). … VLANs allow network administrators to group hosts together even if the hosts are not directly connected to the same network switch.

What is a trunk port Cisco?

A port on a Cisco switch is either an access port or a trunk port. … Access ports also carry traffic that comes from only the VLAN assigned to the port. A trunk port is by default a member of all the VLANs that exist on the switch and carry traffic for all those VLANs between the switches.

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 VLANs in trunk?

To configure the allowed VLANs for a virtual Ethernet interface, use the switchport trunk allowed vlan command. To remove the configuration, use the no form of this command.

What is VTP and how it works?

VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used by Cisco switches to exchange VLAN information. … VTP enables you to create the VLAN only on a single switch. That switch can then propagate information about the VLAN to every other switch on the network and cause other switches to create it.

Why do we need 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. … A trunk port is capable of having more than one VLAN set up on the interface. As a result, it is able to carry traffic for numerous VLANs at the same time.

Is a trunk port tagged or untagged?

The trunk port sends an egressing packet with a VLAN that is equal to the default port VLAN ID as untagged; all the other egressing packets are tagged by the trunk port. If you do not configure a native VLAN ID, the trunk port uses the default VLAN.

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.

What is port mirroring used for?

Port mirroring is used on a network switch to send a copy of network packets seen on one switch port (or an entire VLAN) to a network monitoring connection on another switch port.

What is VLAN trunking used for?

VLAN trunking enables the movement of traffic to different parts of the network configured as a VLAN. A trunk is a point-to-point link between two network devices that carry more than one VLAN. With VLAN trunking, you can extend your configured VLAN across the entire network.

Can you trunk a switch to a router?

This trunk can carry traffic from all four VLANs. … The trunk link from the first switch to the router can also carry all four VLANs. In fact, this one connection to the router allows the router to appear on all four VLANs, as if it had four different physical ports connected to the switch.

What is a trunk port and access port?

access port – a port that can be assigned to a single VLAN. The frames that arrive on an access port are assumed to be part of the access VLAN. … trunk port – a port that is connected to another switch. This port type can carry traffic of multiple VLANs, thus allowing you to extend VLANs across your entire network.

What is the difference between access and trunk port?

An access port can have only one VLAN configured on the interface; it can carry traffic for only one VLAN. A trunk port can have two or more VLANs configured on the interface; it can carry traffic for several VLANs simultaneously.

How do I add a trunk port to a VLAN?

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.