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To simplify troubleshooting and focus on the time/date, it is easier to have the entire device time-sync using an NTP server. For more details, see the following link:
Understanding Simple Network Time Protocol / Configure SNTP: www.cisco.com/en/US/partner/docs/wireless/access_point/12.4_10b_JA/configuration/guide/scg12410b-chap5-admin.html#wp1036313
To get permanent logging, you can use a syslog server to send all the relevant information. You can find out how to configure system message logging at the following link:
An access point can act as a local DHCP server to assign IP address settings to devices on both your wired and wireless LANs for the Layer 3 subnet, which the BVI interface belongs to. Therefore, the local DHCP server can serve only one subnet because the access point has only one BVI interface. In a setup with multiple service set identifiers (SSID), the local DHCP server will provide an IP address only to the STA for the subnet belonging to the BVI interface.