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+====== Additional UserPort security by deploying Loopback-Detection ======
+The function Loopback-Detection (LBD) detects and avoids similar to UserPorts-Security (aka "BPDUShutdown") loops in the network. In contrast to BPDUShutdown/UserPorts-Security this feature will also detect loops if STP/BPDUs are disabled or somehow filtered by the adjacent device, this happens if the Smarter-SOHO-Switch processes the BPDU and sends it to its own software stack / CPU but doesn't have an implementation for STP/BPDU.
+The feature is based on Multicast-frames that will be forwarded even by the Smarter-SOHO-Switches and let us securely detect and avoid network loops by shutting down the ports:
+<code>
+loopback-detection enable
+loopback-detection port 1/1 enable
+loopback-detection port 1/x-y enable
+</code>
+You can achieve a good baseline of UserPorts security by following the example in this TechTip: [[english:configuration-example-for-userport-security|Configuration example for UserPort security]]