August 8, 2022
Some people ask, do 100-channel surveillance cameras need to use core switches?
When understanding whether to use a core switch, let's first understand the role of the core switch.
1. The role of each layer switch
Access layer: The access layer is to directly connect the user's computer and connect various network resources to the network. It provides users with the ability to access the application system on the local network segment, mainly solves the mutual access requirements between adjacent users, and provides sufficient bandwidth for these accesses.
Convergence layer: The "intermediary" between the network access layer and the core layer is to do aggregation before the workstation accesses the core layer to reduce the load of the core layer equipment. The aggregation layer has multiple functions such as policy enforcement, security, workgroup access, routing between virtual local area networks (VLANs), and source or destination address filtering.
Core layer: The main purpose is to provide fast and reliable backbone data exchange through high-speed forwarding of communications.
2. Why use core switches
Basically, it is not necessary to use a core switch if the number of channels is less than 50, and a Layer 2 switch can be added with a router. However, if there are about 100 channels, the efficient routing function of the core switch will be used.
First of all, 100-channel monitoring belongs to a medium-sized network, and its network bears little or no pressure, and data delay may occur at any time.
The core switches are generally Layer 3 switches (one of the main functions of the core switches is VLAN routing, so the core switches will require the use of Layer 3 switches).
1. If the core switch is not used, all monitoring is in one subnet, which may form a broadcast storm enough to paralyze the entire network, and the security is also very poor.
2. The Layer 3 core switch realizes the IP routing function by using a hardware switching mechanism, and its optimized routing software improves the efficiency of the routing process and solves the speed problem of traditional router software routing. As mentioned above, the Layer 3 core switch also plays an important role in connecting subnets while ensuring high speed and efficiency.
100-channel monitoring, in order to reduce the number of computers in the same network can not be too large. It is inevitable that VLANs need to be divided, so it is necessary to further divide many IP subnets to prevent broadcast storms. The tasks between the subnets will also depend on the Layer 3 switch, which is the "mainstay".
3. The Layer 3 core switch is scalable. When the Layer 3 switch is connected to multiple subnets, the subnets are only logically connected to the Layer 3 switching module. Traditional routers do not need to add ports. If you need to add network equipment, because various expansion module interfaces are reserved, you can directly expand the equipment without changing the original network layout and original equipment, which protects the original investment.
High security is also an important aspect of the attractiveness of Layer 3 switches. The core network layer of the three-layer switch is definitely the target of network hackers. In terms of software, a highly reliable arson wall can be configured to block unidentified data packets. And you can access the list, through the settings of the access list, you can restrict internal users to access some special IP addresses.
3. What is a core switch
Core switches are not a type of switches, but switches placed at the core layer (the backbone of the network) are called core switches. Generally, large-scale enterprise networks and Internet cafes need to purchase core switches to achieve powerful network expansion capabilities to protect the original Investment, a certain number of computers will use the core switch, and basically no core switch is needed for less than 50 computers, only a router is required. The so-called core switch is for the network architecture. If it is a small LAN with several computers , an 8-port small switch can be called a core switch! In the network industry, a core switch refers to a Layer 2 or Layer 3 switch with network management functions and powerful throughput, a network with more than 100 computers. If you want to run stably and at high speed, core switches are essential.
4. What is the difference between a core switch and an ordinary switch?
1. The difference between ports
The number of ordinary switch ports is generally 24-48, and most of the network ports are Gigabit Ethernet or Fast Ethernet ports. The main function is to access user data or aggregate some switch data at the access layer. Configure Vlan simple routing protocol and some simple SNMP functions, the backplane bandwidth is relatively small.
The core switch has a large number of ports, which are usually modular and can be freely matched with optical ports and Gigabit Ethernet ports. Generally, the core switches are Layer 3 switches, which can set various advanced network protocols such as routing protocol/ACL/QoS/load balancing. The most important point is that the backplane bandwidth of the core switch is much higher than that of the ordinary switch, and usually has a separate engine module, which is the main and standby.
2. Differences in user connection or access to the network
The part of the network that directly connects or accesses the network is usually called the access layer, and the part between the access layer and the core layer is called the distribution layer or the aggregation layer. The purpose of the access layer is to allow end users to connect to the network. , so the access layer switch has the characteristics of low cost and high port density. The aggregation layer switch is the aggregation point of multiple access layer switches, it must be able to handle all traffic from the access layer devices and provide uplinks to the core layer, so the aggregation layer switch has higher performance, less interface and higher exchange rate.
The main part of the network is called the core layer. The main purpose of the core layer is to provide an optimized and reliable backbone transmission structure through high-speed forwarding of communication. Therefore, the core layer switch application has higher reliability, performance and throughput.
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