Koenv,
If you can replicate the circumstances, please try:
show ap virtual-beacon-report client-mac <mac of client>
..to see what access points have seen that client, potentially. If a client is connected to the G band, it must be weaker than Client Match Band Steer G Band Max Signal (-45 by default) and the 802.11a access point we want to steer it to must also be stronger than Client Match Band Steer A Band Min Signal (-75 by default). That is to prevent a user that has a good G signal from being steered to a bad 802.11a signal.
Here are the rules:
- If the client is connected at -45 or stronger to an 802.11g AP, we will not attempt to steer the client.
- If the 802.11a AP we want to steer it to sees it as weaker than -75, we will not attempt to steer the client.
- We only attempt to steer to the 802.11a side of the access point it is currently connected to.
If any of those conditions existed, there would not be a steer attempt, even if the client was connected for hours. We have seen that if we steer a client to an 802.11a access point that is weaker than -75, it will just keep going back to the 802.11g side of the AP.