Basic Cwmp Functions - HP 5500 EI Series Configuration Manual

• CPE—Customer premises equipment, the managed device in the network.
ACS—Autoconfiguration server, the management device in the network. In this document, ACS
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refers to the server installed with the HP IMC BIMS system.
DNS server—Domain name system server. An ACS and a CPE use URLs to identify and access each
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other. DNS is used to resolve the URLs.
• DHCP server—Assigns IP addresses to CPEs, and uses the options filed in the DHCP packet to
provide configuration parameters (such as URL) to the CPEs.

Basic CWMP functions

Automatic configuration file deployment
The network administrator can create different configuration files on the ACS for access switches
according to their service functions to realize fast configuration. After a connection is established
between the ACS and a CPE, the ACS determines the type of the CPE and delivers the corresponding
configuration file to the CPE. In this way, CPEs of the same type obtain the same service configurations.
The ACS divides CPEs by their switch models or serial IDs.
A configuration file delivered by the ACS can be either the startup configuration or the running
configuration on the CPE.
• Startup configuration—The configuration file delivered by the ACS overwrites the default
configuration file on the CPE. After the CPE reboots, it runs the new configuration file.
Running configuration—The configuration file delivered by the ACS is written to the running
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configuration file on the CPE, and the new configurations take effect immediately. You need to save
the new configurations to make them survive a switch reboot.
CPE system software image file and configuration file management
The network administrator can save important files such as the application file and configuration file of
a CPE to an ACS. If the ACS finds that a file is updated, it notifies the CPE to download the file by sending
a request. After the CPE receives the request, it automatically downloads the file from the specified file
server according to the filename and downloading address provided in the ACS request. After the CPE
downloads the file, it checks the file validity and then reports the download result (success or failure) to
the ACS.
CPEs can download the following types of files from the ACS: application file and configuration file.
To backup important data, a CPE can upload the current configuration file and log files to the specified
server according to the requirement of an ACS.
CPE status and performance monitoring
An ACS can monitor the parameters of a CPE connected to it. Different CPEs have different performances
and functionalities. Therefore the ACS must be able to identify each type of CPE and monitor the current
configuration and configuration changes of each CPE. CWMP also allows the administrator to define
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