Onlookers: layer-2 exchange technology PK layer-3 Exchange Technology

Onlookers: layer-2 exchange technology, PK layer-3 exchange technology. A traditional LAN switch is a L2 network device that constantly collects information during operations to create a MAC address table. Layer-3 switching is also called multi-layer switching technology or IP address switching technology.

In today's network construction, the layer-3 switching technology is recognized and praised by users for its efficient performance and superior performance/price ratio. At present, layer-3 switching technology has been widely used in many occasions, such as enterprise networks, campus network construction, and smart community access. market demands and technological updates promote the development of such applications in depth.

Traditional L2 Exchange Technology

A traditional LAN switch is a two-layer switch technology network device that constantly collects information during operations to create a MAC address table. This table is quite simple and basically shows the port on which a MAC address is found.

Then, when the switch receives an Ethernet packet, it will view the destination MAC address of the packet and check its address table to confirm the port from which the packet is sent. But when the switch receives an unknown packet, that is to say, if the destination MAC address is not in the MAC address table, the switch will "spread" the packet.

That is to say, sending from all ports is the same as receiving a broadcast packet from the L2 Switch Technology, which exposes the weakness of the traditional LAN switch: it cannot effectively solve problems such as broadcast, heterogeneous network interconnection, and security control. Therefore, the VLAN Virtual LAN technology on the switch is generated.

Layer-3 Switching Technology

Layer-3 switching is also called multi-layer switching technology or IP address switching technology. As we all know, the traditional exchange technology operates on the Layer 2-data link layer in the OSI Standard network model, while the Layer 3 exchange technology implements high-speed packet forwarding in the network model.

Simply put, layer-3 switching technology is "layer-2 switching technology + layer-3 forwarding ". The emergence of layer-3 switching technology solves the problem that the subnet in the network segment must be managed by the router after the network segment is divided in the LAN, and solves the network bottleneck problem caused by the low speed and complexity of the traditional router.