HP VPN Firewall Appliances System Management and Maintenance Configuration Guide

230
• ACS—Autoconfiguration server, the management device in the network.
• CPE—Customer premises equipment, the managed device in the network.
• DNS server—Domain name system server. CWMP defines that an ACS and a CPE use URLs to
identify and access each other. DNS is used to resolve the URLs.
• DHCP server—Assigns IP addresses to CPEs, and uses the options field in the DHCP packet to issue
configuration parameters to the CPE.
Your device can work as the CPE but not the ACS.
Basic CWMP functions
Autoconnection between ACS and CPE
A CPE can connect to an ACS automatically by sending an Inform message. The following conditions
might trigger an autoconnection establishment:
• A CPE starts up. A CPE can find the corresponding ACS according to the acquired URL, and
automatically initiates a connection to the ACS.
• A CPE is configured to send Inform messages periodically. The CPE automatically sends an Inform
message at the configured interval to establish connections.
• A CPE is configured to send an Inform message at a specific time. The CPE automatically sends an
Inform message at the configured time to establish a connection.
• The current session is interrupted incorrectly. In this case, if the number of CPE autoconnection
retries does not reach the limit, the CPE automatically establishes a connection.
An ACS can initiate a connection request to a CPE at any time, and can establish a connection with the
CPE after passing CPE authentication.
Autoconfiguration
When a CPE logs in to an ACS, the ACS can automatically apply some configurations to the CPE for it
to perform auto configuration. Autoconfiguration parameters supported by the device include the
following:
• Configuration file (ConfigFile)
• ACS address (URL)
• ACS username (Username)
• ACS password (Password)
• PeriodicInformEnable
• PeriodicInformInterval
• PeriodicInformTime
• CPE username (ConnectionRequestUsername)
• CPE password (ConnectionRequestPassword)
CPE system software image file and configuration file management
The network administrator can save CPE system software image files and configuration files on the ACS
and configure the ACS to automatically request the CPE to download any update made to these files.
After the CPE receives an update request, it automatically downloads the updated file from the file server
according to the filename and server address in the ACS request. After the CPE downloads the file, it
checks the file validity and reports the download result (success or failure) to the ACS.