Configuring MAC Address Flapping Detection to Quickly Detect Loops

If a loop occurs, MAC address flapping must have occurred on the failure point. You can use the MAC address flapping function to locate the loop.

Enable MAC address flapping detection to check whether a loop occurs in the following scenarios:

MAC address flapping detection is easier to configure than many other loop detection technologies. Table 1 compares the loop detection technologies.

**Table 1** Comparison of loop detection technologies
Feature	Advantage	Disadvantage
MAC address flapping detection	Checks all interfaces and VLANs on a device. Requires only one command and is enabled by default.	After detecting a loop, the switch only reports alarms; it cannot eliminate the loop.
Loopback detection	Detects loops based on interfaces and VLANs. Eliminates a loop after detecting it.	This function is not enabled by default and needs to be configured through commands.