Cisco − Trunking Between Catalyst 4000, 5000, and 6000 Family Switches Using 802.1q Encapsulation
This document introduces the concept of trunking between two Ethernet switches and focuses on the IEEE 802.1q trunking standard. After a brief description of the 802.1q trunking mechanism, the implementation on the Catalyst 4000, 5000, and 6000 range of switches will be described.. A full example is provided, along with some common errors related to 802.1q trunking configuration.
What is a Trunk?
In Cisco's terminology, a trunk is a point−to−point link carrying several VLANs. The purpose of a trunk is to save ports when creating a link between two devices implementing VLANs, typically two switches. In the following diagram, we can see two VLANs that we want available on two switches, Sa and Sb. The first easy method to implement is to create two physical links between the devices, each one carrying the traffic for a VLAN......
In Cisco's terminology, a trunk is a point−to−point link carrying several VLANs. The purpose of a trunk is to save ports when creating a link between two devices implementing VLANs, typically two switches. In the following diagram, we can see two VLANs that we want available on two switches, Sa and Sb. The first easy method to implement is to create two physical links between the devices, each one carrying the traffic for a VLAN......
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