802.1Q or dot1q Trunking Protocol Explained
IEEE 802.1Q is a trunking protocol . It is also known as dot1Q . It provides encapsulation on trunk ports. Trunk ports work with multiple VLANs. They use the trunking protocol to manage VLAN information on Ethernet frames.
To send traffic for multiple VLANs between switches, you need a trunk link and a trunking protocol . 802.1Q is the most common trunking protocol . A trunking protocol is required because a standard Ethernet frame has no field to identify to which VLAN the Ethernet frame belongs to. 802.1Q solves this by inserting a "tag" into the frame that ...
802.1Q Trunking Explained
802.1Q Trunking allows VLANs to span across multiple switches. Learn how this tagging protocol works and why it's essential for inter-switch communication.
This document describes the difference of IEEE 802.1Q ( dot1q ) trunking between Cisco Catalyst switches that run Cisco IOS® Software.
VLAN Trunking Explained
VLAN trunking fundamentals on Cisco switches: 802.1Q tagging, allowed VLAN lists, and trunk negotiation, verified with real IOS XE show output.
IEEE 802.1Q , often referred to as Dot1q , is the networking standard that supports virtual local area networking (VLANs) on an IEEE 802.3 Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.
IEEE 802.1Q
IEEE 802.1Q is the networking standard that defines VLAN (Virtual Local Area Network) tagging on Ethernet frames. VLANs allow network administrators to segment a physical network into multiple logical networks, improving security, efficiency, and management.
Configure an 802.1Q trunk between Cisco switches: tag VLANs, set the native VLAN, prune the allowed list, and verify with show interfaces trunk.
802.1Q VLAN Tagging
Complete CCNA 802.1Q VLAN Tagging guide: tag structure, native VLAN, trunk ports, Q-in-Q, VLAN hopping mitigation, MTU, Cisco IOS configuration, and troubleshooting.
This lesson explains how 802.1Q tunneling works and how to configure it on Cisco IOS Catalyst Switches.