Cause why an AR cannot learn correct MAC address entries

The possible causes are as follows:
- The AR does not receive packets because the link is Down, the interface does not join the VLAN, the interface participates in spanning tree calculation and is blocked, or MAC address flapping detection is configured and the interface or MAC address is blocked.
- Loops cause MAC address flapping.
- The AR is disabled from learning MAC address entries or the sticky MAC function is enabled on the interface.
- The number of learned MAC address entries has reached the maximum.
- The static or blackhole route is configured.

Scroll to top