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1: The network cable between the switch and the camera is abnormal. The camera cannot be monitored properly.
2: The cameras are very far apart. The construction cost and the wiring are messy.
3: The number of cameras is large. One port of the switch is connected to one camera. The construction cost and equipment cost rise sharply.
solution:
Using TG-NET Gigabit Access Switch S3500 series, use security monitoring downlink multi-ring technology. The following topology 
Help you achieve:
1: Low-cost networking, less network equipment usage, and less use of network transmission media;
2: No single point of failure, cameras in the ring network have backup links;
3: The layout is elegant, and the layout of the computer room network cable becomes relatively simple and regular;
Downstream multi-loop technical difficulties:
1: The access layer switch must support ring protocols such as STP, RSTP, and MSTP, and the convergence time of the protocol meets the network requirements.
2: Access switches must support VLAN and multicast functions;
3: The camera must support 2 network interfaces;
4: The camera supports ring network protocol at the same time.
(An advertisement for Dahua, my Dahua Camera perfectly supports this feature) 
TG solution other advantages:
Centralized management:
Cloud-box, cloud-side, mobile-end-side maintenance network, network monitoring, network configuration, network alarm;
Monitoring priority:
Flexible application of QoS protocol to monitor data transmission priority;
Complete multicast:
Core switches MVR, IGMP Snooping, IP source protection, security monitoring network requirements for multicast applications; 
Have you encountered these puzzles as well?
Network management anywhere, anytime