VLAN-tagged frame:

An Ethernet frame, carrying VLAN tag field, contains VLAN identification without the value of 0 and 4095, and priority information.

Priority-tagged frame:

An Ethernet frame, carrying VLAN tag field, contains VLAN identification with the value of 0 and priority information.

Untagged frame:

An Ethernet frame carries no VLAN tag information.

VLAN Identifier:

Also referred to as VID. It is used to identify a member whether it belongs to the VLAN group with the VID. The assignable number is 1- 4094. If VID=0, the tagged frame is a priority packet. Both the value of 0 and 4095 also cannot be assigned in VLAN management.

Port VLAN Identifier:

VLAN identifier of a port. It is also referened to as PVID. When an untagged frame or a priority-tagged frame is received, the PVID of that port will be inserted in the VLAN tag field of the frame. This frame with VID assigned by a port is called PVID. Each port can only be assigned one PVID. The default value for PVID is 1, which is the same as VID.

Ingress filtering:

This is the process to check a received packet and compare its VID to the VLAN membership of the ingress port. The ingress filtering can be set by per port. When receiving a packet, the VLAN bridge will examine if the VID in the frame’s header presents.

If the VID of the received packet presents, the VID of the packet is used. The VLAN bridge will check its MAC address table to see if the destination ports are members of the same VLAN. If both are members of the tagged VLAN, then the packet will be forwarded.

If the packet is untagged or a null tag packet, the ingress port’s PVID is applied to the packet. The VLAN bridge will then look up the MAC address table and determine as which ports the packet should be forwarded to. Next, it will check to see if the destination ports belong to the same VLAN with that PVID. If the destination ports are members of the VLAN used by ingress port, the packet will be forwarded.

Note: VID can not be 0 or 4095.

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Edimax Technology ES-5240G+ user manual

ES-5240G+ specifications

Edimax Technology ES-5240G+ is a highly versatile and efficient Ethernet switch designed to cater to the networking needs of small to medium-sized businesses and home offices. With its robust features and reliable performance, this switch is an essential component for a seamless network infrastructure.

One of the standout features of the ES-5240G+ is its 24 10/100/1000Mbps Gigabit Ethernet ports. This allows for high-speed connectivity, enabling users to transfer large files quickly and efficiently. The switch is equipped with a non-blocking architecture, ensuring that all ports can be utilized simultaneously without any reduction in bandwidth. This is particularly beneficial for businesses that rely on high-speed internet and internal networks for their daily operations.

The ES-5240G+ supports advanced Layer 2 switching features, including VLAN (Virtual Local Area Network) support, port mirroring, and link aggregation. These features enhance network management and optimization, making it easier to segment network traffic and improve security. With VLAN support, users can create separate networks within the same switch, leading to improved performance and reduced broadcast traffic.

Moreover, the ES-5240G+ incorporates IEEE 802.3x Flow Control, which helps to prevent data loss during heavy traffic periods. This technology allows for effective communication between devices and ensures smooth data transmission, even in congested network environments. Additionally, the switch is equipped with Automatic MDI/MDI-X detection, eliminating the need for crossover cables and simplifying installation.

From a security perspective, Edimax has included features such as address filtering and port security, which help to protect the network from unauthorized access. The switch can restrict access to specific MAC addresses, providing an added layer of security for sensitive data.

In terms of energy efficiency, the ES-5240G+ is designed to comply with IEEE 802.3az Energy Efficient Ethernet standards. This technology helps to reduce power consumption during low-traffic periods, making it an eco-friendly choice for businesses looking to minimize their carbon footprint.

Overall, Edimax Technology ES-5240G+ stands out as a reliable and efficient Ethernet switch, equipped with a range of features that enhance network performance and security. Its capabilities make it an ideal choice for businesses seeking to streamline their networking infrastructure and improve operational efficiency.