4.4.16 Loop Detection Configuration
In a real network, it is possible the people misconnect the network cable to incur loop condition. In
a worst case, the network is out of service thereafter. This section gives a guide to configure the
Loop Detection function of the system to prevent the system from loop.
After a proper setting of Loop Detection function, the system detects loop condition by periodically
sending loop detection packet. Once the system receives the loop detection packet from itself, it is
claimed that it detects loop condition. Then, the system takes the following actions
1. It blocks the relevant port to prevent broadcast storms. In other words, the system stops
forwarding all the traffic via the looped port. However, the system will process the loop
detection packet received on the looped port.
2. It slowly blinks the LED of looped port in orange.
3. It periodically sends loop detection packet to detect the existence of loop condition.
When the system does not receives any loop detection packet from itself for a period of configured
Looped port unlock-interval. The system claims the loop condition disappears. Then, the system
takes the following actions
1. It un-blocks the relevant port. In other words, the system normally forwards all the traffic via the
relevant port.
2. It stops slowly blinking the LED of looped port in orange.
3. It periodically sends loop detection packet to detect the existence of loop condition.
Note: Under loop condition, the LED of looped port continues to slowly blink orange even the
connected network cable is unplugged out of looped port.
To set up Loop Detection function, select the option Loop Detection Configuration from the
Switch Management menu and then the following screen page appears.
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