I see the error message : %C4K_EBM-4-HOSTFLAPPING:Host [mac-addr] in vlan [num] is flapping between port [num] and port [num] connected to the Access Points. How do we resolve this?
A. This error message occurs when switch learns the same MAC address through multiple ports. This can be due to one of these reasons • When a client roams from one AP to another AP, the new AP informs the client of the MAC address to the switch. If both the APs are connected to the same switch, the MAC address of the client is associated to both the switch ports connected to the APs. This creates a duplicate entry for the client and generates this error message until the time that the switch synchronizes its CAM table. This error message is quite normal in a wireless environment, but, if too much roaming occurs, this can overload the CPU of the switch. Check the client driver and firmware. In addition, ensure that coverage is good so that the client does not roam often. • When there is a loop, the switch can learn the same MAC address through multiple ports connected to other switches. Ensure that the TP is enabled on the switch.
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