Application of gigabit route switches in a domain network

There are many areas worth learning about routing switches. Here we mainly introduce the practical application of gigabit routing switches in the domain network. Gigabit routing switches are mainly used in small and medium enterprises, but because they are expensive, therefore, you must make a comprehensive selection. For the reliability of a gigabit route switch, the Gigabit Ethernet port aggregation PortTrunking) in a gigabit route switch, you can bind multiple Gigabit Ethernet links to a virtual logical link to increase bandwidth, the purpose of reliability.

This technology is called Port aggregation link bundling ). It is common to bind four Gigabit Ethernet links to one link, and the bandwidth can reach one-way 4 Gbps bidirectional 8 Gbps. Multiple Gigabit Ethernet key channels in Port aggregation can achieve load balancing. Even if the optical fiber of one of the links fails, the logical link will continue to work normally. Port gathering requires a large amount of optical fiber. The aggregation of two ports requires four optical fiber cables, and the aggregation of three ports requires six optical fiber cables, eight optical fiber cables are required for the gathering of four ports.

The same 1 + 1 backup of Gigabit Ethernet is similar to the one + 1 backup of the physical link of the ATM implemented by many ATM switches. The Gigabit Ethernet can also achieve a backup of 10 million, that is, the interface module of a gigabit route switch corresponds to a Gigabit Ethernet key. Actually, two Gigabit Ethernet links are used for connection, and one gigabit Ethernet link is used as the primary key, the other is used as the backup Key Path.

When the optical fiber of the active link fails, the Gigabit route switch can switch data to the optical fiber of the standby Key Path for transmission within 1 ms. In this 1 + 1 backup mode, four optical fiber cables are required for 1 Gbps transmission bandwidth. Each Gigabit Ethernet link requires one optical fiber and one optical fiber.

IP routing is used to ensure the reliability of man. If Gigabit Ethernet is used to carry IP services, convergence of IP routing protocol can be applied to ensure the reliability of man. With IP routing, the network topology can be a star, ring, or mesh network, or a combination of them.

This article also points out that, if IP routing is not used, due to the function of the Spanning Tree Protocol SPanningTree, Gigabit Ethernet forms a ring or mesh network even on the physical key road, the actual Ethernet data exchange on the switch cannot constitute a ring or a mesh network. In the topology of the ring and mesh networks, even if a link or a network node fails, the entire network will not be paralyzed due to the existence of a roundabout route.

The most typical IP routing protocol in Man is OSPF. Routers running OSPF use Hello messages to periodically transmit the router status. When a neighboring node is found to be faulty, the router recalculates the route, route entries that can be used to restore the network. This process is called routing convergence.

Generally, the convergence time of OSPF protocol is greater than 10 seconds. Compared with the 1 + 1 backup mode of a gigabit route switch, the OSPF protocol takes a long time to recover from a fault. In the current form, Radio and Television Broadband man hosts IP-based services, the platform that hosts IP addresses mainly includes four technologies: ATM, Gigabit Ethernet, POS, and DPT.

This article will not compare the IP addresses hosted by ATM and Gigabit Ethernet, but will discuss this topic in another article. POS was originally used to carry IP addresses on SDH over the Wan, and can also be used in man over the optical fiber. DPT is CISCO's proprietary man technology.