If you are not a professional, you know very little about the core switch . In fact, it is not a type of switch, so it may be difficult to understand. So what is a core switch? The following decoration home decoration network Xiaobian will bring you the core switch configuration standards for your reference.
What is a core switch?
A core switch is not a type of switch, but a switch placed at the core layer (the backbone of the network) is called a core switch. The core switches should all adopt a modular structure, must have a considerable number of slots, and have strong network expansion capabilities to protect the original investment. The modular structure has more powerful performance, greater flexibility and expandability, and can choose modules of different numbers, different speeds and different interface types according to actual or future needs to adapt to the ever-changing network requirements.
Core switch configuration standards:
1. Scalability should include two aspects: (1) the number of slots. The slot is used to install various functional modules and interface modules. Since the number of ports provided by each interface module is fixed, the number of slots fundamentally determines the number of ports that the switch can accommodate. In addition, all functional modules (such as Super Engine Module, IP Voice Module, Extended Service Module, Network Monitoring Module, Security Service Module, etc.) need to occupy one slot, so the number of slots fundamentally determines the scalability of the switch. Sex. (2) Module type. There is no doubt that the more supported module types (such as LAN interface modules, WAN interface modules, ATM interface modules, extended function modules, etc.), the more scalable the switch. Take the LAN interface module as an example, it should include RJ-45 module, GBIC module, SFP module, 10Gbps module, etc., to meet the needs of complex environments and network applications in large and medium-sized networks.
2. Backplane bandwidth: Bandwidth is the maximum amount of data that can be handled between the switch interface processor or the interface card and the data bus, just like the sum of the lanes owned by the overpass. Since communication between all ports needs to be completed through the backplane, the bandwidth that the backplane can provide becomes a bottleneck in concurrent communication between ports. The larger the bandwidth, the larger the available bandwidth provided to each port, and the faster the data exchange speed; the smaller the bandwidth, the smaller the available bandwidth for each port, and the slower the data exchange speed. That is to say, the bandwidth of the backplane determines the data processing capability of the switch. The higher the bandwidth of the backplane, the stronger the ability to process data. Therefore, the larger the backplane bandwidth, the better, especially for those aggregation layer switches and central switches. If you want to achieve full-duplex non-blocking transmission of the network, you must meet the minimum backplane bandwidth requirements.
3. Forwarding rate: The data in the network is composed of one data packet, and the processing of each data packet consumes resources. The forwarding rate (also called throughput) refers to the number of packets that pass in a unit of time without packet loss. Throughput is like the traffic flow of an overpass, which is the most important parameter of a three-layer switch, marking the specific performance of the switch. If the throughput is too small, it will become a network bottleneck, which will have a negative impact on the transmission efficiency of the entire network. The switch should be able to achieve wire-speed switching, ie the switching rate reaches the data transmission speed on the transmission line, thus minimizing the switching bottleneck. For gigabit switches, for non-blocking transmission of the network, the packet forwarding rate of each Gigabit wire-speed port is 1.488 Mpps, and the packet forwarding rate of each 100-Mbps port is 0.1488 Mpps.
4. Layer 4 switching: Layer 4 switching is used to achieve fast access to network services. In Layer 4 switching, the decision is based on not only the MAC address (Layer 2 bridge) or the source/destination address (Layer 3 routing), but also the TCP/UDP (Layer 4) application port number, which is designed. Used in high speed intranet applications. In addition to the load balancing function, Layer 4 switching supports transport stream control based on application type and user ID. In addition, the Layer 4 switch is placed directly on the front end of the server, which understands the application session content and user rights, making it an ideal platform to prevent unauthorized access to the server.
5, module redundancy: redundancy is the guarantee of network security operation. No manufacturer can guarantee that its products will not malfunction during operation. The ability to switch quickly when a failure occurs depends on the redundancy of the device. For the core switch, important components should have redundancy, such as management module redundancy, power redundancy, etc., in order to ensure the stable operation of the network to the greatest extent.
6, the redundant routes: using HSRP, VRRP protocol guarantees that load balancing and hot backup core device, when a switch core and a switch double aggregation switch fails, three virtual gateway routing device and fast-switching, dual Redundant backup of the line to ensure the stability of the entire network.
The above is what Xiaobian brought to you. What is the core switch? The core switch configuration standard, I believe that everyone has a basic understanding of the core switch after reading this article, if you want to know more about decoration consultation, please click to enter the decoration knowledge channel .
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How is the switch configured? Most detailed switch configuration steps
How is the switch used correctly? How to use the switch
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