Hello Experts.
What is VLAN Trunking?
A Trunk link is a point-to-point link between two network devices. Trunk link carry more than one VLAN. With VLAN trunking, we can extend our configured VLAN across the entire network. Remember, sending information from an access link on one VLAN to another VLAN is not possible without the additional device a router or a external layer 2 bridge connected between the VLAN.
A Trunk link can transport multiple VLANs traffic through a single switch port. A trunk link is not assigned to a specific VLAN.
Types of links/ports.
Access links
Connecting to end devices (hosts or router)
Part of one VLAN
Trunk links
Do not belong to any VLAN
Its Carry multiple VLANs traffic
It’s a physical Link between two switches
Frame tagging
In order to make sure that same VLAN users on different switch communicate with each other there is a method of tagging happens on trunk links. Tag is added before a frame is send and removed once it is received on trunk link. Frame tagging happen only on the trunk links.
VLAN Frame Identification
Read more here:
Internetworks: What is VLAN Trunking? How to configure?