What is a Web Ring?

Network loops are also divided into layer 2 loops and layer 3 loops. The formation of all loops is caused by the confusion caused by the unclear destination path. For example, in the second layer, when a broadcast message passes through two switches Broadcasts will continue to be generated in a vicious circle, causing loops, while the third-level loop is the original route unexpectedly inoperable, causing routing announcement errors, forming a vicious circle

Network loop

Right!

Network loops are also divided into layer 2 loops and layer 3 loops. The formation of all loops is caused by the confusion caused by the unclear destination path. For example, in the second layer, a broadcast message passes through two

Network 192.168.0.0/24

The Layer 2 loop of the network usually moves in the office area or

1. The loop caused a network broadcast storm, exhausted the switching resources, and caused the switch to fail.

Broadcast messages in the network, after entering the loop, are continuously cyclically forwarded and broadcast, which cannot be ended. A large number of data packets can make the switch's CPU reach 85-100%, causing the switch to be paralyzed.

2. MAC address drift occurs in the loop, causing network interruption.

Because the switch has a learning function, as long as the host in the network sends a broadcast message, the MAC address will be learned to the port in the network loop. The wrong MAC address table will directly cause network interruption. MAC address drift is the main cause of immediate network interruption. ^[1]

Traditional Layer 2 prevention technology mainly uses STP (Spanning tree) to prevent. STP is constantly modified and updated to produce multiple versions such as STP / RSTP / MSTP. You can choose applications according to your own networking plan However, the complexity of STP configuration and the overhead of the protocol itself are usually a headache for network managers.