<div>
<div class="content wysiwyg-content">
On one of my switches I have seen the following entry when the running-config command is executed<br />
switchport trunk allowed vlan 6-9,20-22<br />
Does this entry means that the trunked port allows to go through VLANS 6,7,8 and 9 and VLANS 20, 21 and 22?
</div>
</div>


On one of my switches I have seen the following entry when the running-config command is executed
switchport trunk allowed vlan 6-9,20-22
Does this entry means that the trunked port allows to go through VLANS 6,7,8 and 9 and VLANS 20, 21 and 22?

VLANs

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.