Do 100-channel surveillance cameras need to use core switches?

Someone asked, do 100-channel surveillance cameras need to use core switches? In understanding whether to use the core switch, we first understand the role of the core switch.

First, the role of each layer of switches

Access layer: The access layer directly connects user computers and allows various network resources to access the network. It provides users with the ability to access application systems in the local network segment, mainly solves the need for mutual access between adjacent users, and provides sufficient bandwidth for these accesses.

Aggregation layer: The "intermediary" between the network access layer and the core layer is to converge before the workstation accesses the core layer to reduce the load on the core layer equipment. The aggregation layer has multiple functions such as implementation strategy, security, workgroup access, routing between virtual local area networks (VLANs), source address or destination address filtering.

Core layer: The main purpose is to provide fast and reliable backbone data exchange through high-speed forwarding communication.

Second, why use core switches

Basically, no need to use core switches under 50 channels, two-layer switches plus routers, and about 100 channels, will use the core switch efficient routing function.

First of all, the 100-channel monitoring belongs to a medium-sized network. His network bears little or no pressure, and data delay may occur at any time.

The core switch is generally a layer 3 switch (one of the main functions of the core switch is VLAN routing, so the core switch will require the use of a layer 3 switch).

1. If the core switch is not used, all monitoring is in a subnet, and a broadcast storm may be formed enough to paralyze the entire network, and the security is also very poor.

2. The three-layer core switch implements the IP routing function by using a hardware switching mechanism. Its optimized routing software makes the routing process more efficient and solves the problem of the speed of traditional router software routing. As mentioned above, the three-layer core switch also has an important role to connect 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 the VLANs will need to be divided, so many IP subnets should be further divided to prevent broadcast storms. The task between the subnets also depends on the "mainstay" of the layer 3 switch.

3. The layer 3 core switch has extensible rows. The layer 3 switch is connected to multiple subnets. The subnets only establish logical connections with the layer 3 switching modules. Traditional routers do not need to add ports. If network equipment needs to be added, since various expansion module interfaces are reserved, the equipment can be directly expanded without changing the original network layout and the original equipment, thereby protecting the original investment.

High security is also an important aspect of the attractiveness of Layer 3 switches. The network layer where the three-layer switch is at the core is definitely the target of network hacker attacks. The configuration of a high-reliability fire wall in software can prevent unidentified data packets. And can access the list, through the settings of the access list can restrict internal users to access some special IP addresses.

3. What is a core switch

The core switch is not a type of switch, but the switch placed in the core layer (the backbone part of the network) is called the core switch. Generally, large-scale enterprise networks and Internet cafes need to purchase core switches to achieve powerful network expansion capabilities to protect the original Investment, the core switch will be used only when the computer reaches a certain number, and basically no need to use the core switch below 50, there is a router. The so-called core switch is for the network architecture, if it is a small local area network of several computers , An 8-port small switch can be called a core switch! In the network industry, the core switch refers to a layer 2 or layer 3 switch with network management functions and powerful throughput, and a network of more than 100 computers. If you want stable and high-speed operation, the core switch is indispensable.

Fourth, what is the difference between core switches and ordinary switches

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 100M Ethernet ports. The main functions are used to access user data or aggregate some access layer switch data. This kind of switch can be up to Configure Vlan simple routing protocol and some simple SNMP and other functions, the backplane bandwidth is relatively small.

There are many core switch ports, which are usually modularized and can be freely matched with optical ports and Gigabit Ethernet ports. Generally, core switches are all three-layer switches, and various advanced network protocols such as routing protocol / ACL / QoS / load balancing can be set. The main point is that the bandwidth of the backplane of the core switch is much higher than that of the ordinary switch, and there is usually a separate engine module, which is the main backup.

2. The difference between users connecting or accessing the network

The part of the network directly facing the user to connect or access 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 Therefore, the access layer switch has the characteristics of low cost and high port density. The aggregation layer switch is the convergence point of multiple access layer switches. It must be able to handle all traffic from the access layer devices and provide uplink to the core layer. Therefore, the aggregation layer switch has higher performance and 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 communication. Therefore, the core layer switch application has higher reliability, performance and throughput.