What is a ring network?

In the past two days, many friends are asking Xiaobo what is the ring network. What is the role of the ring network? Today, Xiaobo will tell you what exactly is the ring network. What role does it have?

Ethernet ring network (commonly known as ring network) is a ring topology composed of a group of IEEE 802.1 compatible Ethernet nodes. Each node is connected to two other nodes through a ring port based on 802.3 Media Access Control (MAC), and Ethernet MAC. It can be carried by other service layer technologies (such as SDHVC, MPLS Ethernet pseudowire, etc.), and all nodes can communicate directly or indirectly.

At the same time, the Ethernet ring network refers to both the physical ring topology and the logical topology. The traffic is completely forwarded based on the forwarding rules of the IEEE 802.1 specification, supporting point-to-point (E-Line), multi-point to multi-point (E-LAN) and points. Ethernet services such as E-Tree, including Ethernet Private Line (EPL) and Ethernet Virtual Private Line (EVPL), support various modes of communication, including unicast, multicast, and broadcast, to prevent data from being out of order. And repeat. For the ring network interconnection, the Ethernet ring network can be interconnected through three modes: a shared node, a link composed of two shared nodes, and a multi-ring/layer network formed by overlapping Ethernet rings. Services can be delivered end-to-end over interconnected rings.

It is popular to say that a ring network is a network structure in which devices in a network are interconnected into closed loops, and some even have more than one closed loop. When any node on the network fails, the network is disconnected, and the networked device It is still possible to work through other means, such as the city's power supply system, the Internet and other network structures. For example, the power transmission line of the power plant has two factories, one left and one right, and supplies power to the users along the way. The two lines meet in the middle to form a ring network. As long as only one line is disconnected, the power supply is still normal, and the ring network is improved. The reliability of the power supply, of course, the actual connection and control is not that simple.

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