Chapter 5
Setup and Configuration
RUGGEDCOM ROS
User Guide
134
VLAN Concepts
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Section 5.1.2, “Viewing a List of VLANs”
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Section 5.1.3, “Configuring VLANs Globally”
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Section 5.1.4, “Configuring VLANs for Specific Ethernet Ports”
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Section 5.1.5, “Managing Static VLANs”
Section 5.1.1
VLAN Concepts
The following section describes some of the concepts important to the implementation of VLANs in RUGGEDCOM
ROS.
CONTENTS
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Section 5.1.1.1, “Tagged vs. Untagged Frames”
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Section 5.1.1.2, “Native VLAN”
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Section 5.1.1.3, “The Management VLAN”
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Section 5.1.1.4, “Edge and Trunk Port Types”
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Section 5.1.1.5, “Ingress and Egress Rules”
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Section 5.1.1.6, “Forbidden Ports List”
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Section 5.1.1.7, “VLAN-Aware and VLAN-Unaware Modes”
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Section 5.1.1.8, “GARP VLAN Registration Protocol (GVRP)”
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Section 5.1.1.11, “VLAN Advantages”
Section 5.1.1.1
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 5.1.1.2
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.
