Loopback detection usage scenario of S series switch

S series switches (except S1700) can detect self-loops on an interface, loops on the downstream network, and loops between interfaces.
1. Detect self-loops on an interface.
During network deployment, Tx-Rx (fiber transmit end and fiber receive end) self-loops often occur on interfaces. For example, Tx-Rx self-loops often occur when the fiber is inserted incorrectly or the local interface is damaged by high voltage. A self-loop occurs on the interface of the Switch; as a result, packets sent by the interface are sent back to this interface. This may cause problems such as abnormal traffic forwarding and MAC address flapping.
2. A loop occurs on the downstream network or device of the Switch. As a result, packets sent by Interface1 are sent back to this interface after passing through the downstream network or device of the Switch.
3. A loop occurs on the network or between interfaces of the Switch. As a result, packets sent by Interface1 are sent back to Interface2.

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