Overview CWMP

CWMP (CPE WAN Management Protocol) is a protocol developed by the BroadBandForum.org to manage and configure the CPE (Customer Premise Equipment), also called TR-069. It defines the general protocol frame, message standard, management mode, and data model to manage the CPE connecting to the carrier's Internet broadband access network.

CWMP can be described as a data frame model, which describes the communication between the device such as broadband router and the ACS (Auto-Configuration Server). It is used to perform the remote centralized configuration and management to the CPE (such as broadband router, switch, Internet gateway device, and STB) from the user side.

CWMP protocol is an application layer protocol above the IP layer. This protocol can be applied widely and has no restrict on the access mode. CPEs based on the following access modes, such as ADSL- (Asymmetrical Dig2wital Subscriber Loop), Ethernet network, and PON (Passive Optical Network), can use this protocol. System architecture based on the TR069 is shown in Figure 10-1. End-to-end architecture of the CWMP protocol has the following features:

1. With elastic connection model, both the CPE and ACS can trigger the connection establishment. This avoids maintaining connection between the CPE and ACS.
2. It can be automatically discovered between the CPE and ACS.
3. ACS can dynamically configure and monitor the CPE.

Figure 10-1 CPE and ACS architecture

For the CPE, the CWMP mainly completes the following four aspects of work:

1. Configure the CPE automatically and configure the dynamic service. For the ACS, each CPE can mark itself in the protocol, such as the model and version. According to the set rule, the ACS can send the configuration to a certain CPE or to a group of CPEs. The CPE can automatically request the ACS configuration information when it powers on and the ACS can actively initiate the configuration at any time. Through this function, it can achieve the CPE "zero configuration installation" function or control the service parameter dynamic change from the network side.

2. Manage the version file and configuration file of the CPE. The CWMP provides the management and download to the version file and configuration file in the CPE. The ACS can identify the version number of the user device and determines whether to remote update the software version of the device. The ACS can know whether the update succeeds after update completes. The CPE can backup through uploading the configuration file and recover through downloading the configuration file under the ACS control.
3. Configure remote upgrade to the CPE. It is a function initiated by the ACS to configure the remote upgrade to the CPE. Currently, the ACS performs remote upgrade to the CPE configuration in the hierarchical mode.
4. Achieve the secure management to the device interface. Through the RPC mode defined by the CWM (remote process invoking), it can perform secure management to the device interface, including the disabling, enabling, automatic binding, automatic unbinding, 802.1x interface , and disabling the 802.1x function

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  Ensure that the device with Flash as 16M will not power off or reboot when upgrading the version using the CWMP and ensure the correctness of the upgrade version. Otherwise, the system may fail to be booted.

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  When the device works in the VST mode, the device does not support the CWMP function.

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