Configuring Self-Loop Detection on the GE Interface

A router enabled with the loopback detect function periodically sends specially constructed loopback detect packets. If a self-loop exists on an interface, the loopback detect packets will be looped back to the router, and the router can then determine that a self-loop has occurred. A malicious attacker can trick a loopback-detect-enabled router into believing that a self-loop has occurred, by sending loopback detect packets obtained using Sniffer back to the router.

The GE interface self-loop detection function is used only for link self-loop tests in the service deployment phase. To prevent security risks, disable this function after services are running properly.