There is no ssid signal after AP left the first WLC and join to the second WLS. The two vwlc are same model and should have the same configuration. and have the same ap group. Any suggestions? Thank you
What that clearly shows is a different configuration between the two. Backup both controllers and run a diff and verify that the configurations are identical.
Yes like Scott said the config must be the same. You don't mention what WLC or code version you're using but there have been a number of bugs related to the order of the WLANs and vlans getting mismatched when AP switches between WLCs. So to workaround that both (all) WLC must have exactly the same WLANs configured in the AP group (which must obviously have the same name) and the WLANs must be in exactly the same order. If they aren't then delete them and add them back in the same order. Obviously the WLANs should also have the same WLAN ID/number.
