Vlan Concepts; Tagged Vs. Untagged Frames; Native Vlan; Edge And Trunk Port Types - Siemens RX1500 User Manual

RUGGEDCOM ROX II
User Guide
• Section 5.35.7, "Managing VLANs for Virtual Switches"
• Section 5.35.8, "Managing VLAN IDs"
Section 5.35.1

VLAN Concepts

The following sections describe some of the concepts important to the implementation of VLANs in ROX II:
• Section 5.35.1.1, "Tagged vs. Untagged Frames"
• Section 5.35.1.2, "Native VLAN"
• Section 5.35.1.3, "Edge and Trunk Port Types"
• Section 5.35.1.4, "Ingress and Egress Rules"
• Section 5.35.1.5, "Forbidden Ports List"
• Section 5.35.1.6, "VLAN-Aware Mode of Operation"
• Section 5.35.1.7, "GARP VLAN Registration Protocol (GVRP)"
• Section 5.35.1.8, "PVLAN Edge"
• Section 5.35.1.9, "VLAN Advantages"
Section 5.35.1.1

Tagged vs. Untagged Frames

VLAN tags identify frames as part of a VLAN network. When a switch receives a frame with a VLAN (or 802.1Q)
tag, the VLAN identifier (VID) is extracted and the frame is forwarded to other ports on the same VLAN.
When a frame does not contain a VLAN tag, or contains an 802.1p (prioritization) tag that only has prioritization
information and a VID of 0, it is considered an untagged frame.
Section 5.35.1.2

Native VLAN

Each port is assigned a native VLAN number, the Port VLAN ID (PVID). When an untagged frame ingresses a
port, it is associated with the port's native VLAN.
By default, when a switch transmits a frame on the native VLAN, it sends the frame untagged. The switch can be
configured to transmit tagged frames on the native VLAN.
Section 5.35.1.3

Edge and Trunk Port Types

Each port can be configured as an edge or trunk port.
An edge port attaches to a single end device, such as a PC or Intelligent Electronic Device (IED). An edge port
carries traffic on the native VLAN.
Trunk ports are part of the network and carry traffic for all VLANs between switches. Trunk ports are automatically
members of all VLANs configured in the switch.
VLAN Concepts
Chapter 5
Setup and Configuration
725