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Cisco Broadband Access Center 3.8 Administrator Guide
OL-27172-01
Chapter 4 CPE Management Overview
Device Deployment in Cisco BAC
During the process of configuration synchronization:
1. The DPE receives a ParameterKey from the device. If the value of this ParameterKey matches the
one stored in the DPE, no synchronization is initiated. If the ParameterKey values differs, the
synchronization process continues.
2. If access control is set in its configuration, the DPE sets the AccessList parameter to ACS-only. The
access control feature is, by default, enabled. For more information on access control, see Access
Control, page 5-9.
3. If you enable the notification feature, the DPE sets notification attributes as specified in the device
configuration. Notifications are, by default, enabled. For more information on notifications, see
Notification, page 5-8.
4. After the DPE configures the parameter values on the device according to the template, it sets a new
configuration revision number in the ParameterKey argument. This revision number is used to
determine if the device configuration is synchronized the next time the device and the DPE establish
a connection.
If the device connection with the DPE times out during the synchronization process, the CPE
attempts to reconnect to the DPE.
In this scenario, the value of the ParameterKey in the Inform message remains the same, because
only a successful synchronization process changes the ParameterKey value. When the CPE
reconnects to the DPE, the DPE initiates another round of synchronization with the original
ParameterKey value.
5. The synchronization process ends with the DPE forwarding the new value for the ParameterKey
attribute in its last update to the CPE.
In some situations, you must update the device even if the ParameterKey on the DPE matches the one on
the device.
To force a configuration synchronization:
Step 1 From the Devices page, locate the device whose configuration you want to synchronize.
Step 2 Click the Operations icon ( ) corresponding to the device.
The Device Operations page appears.
Step 3 From the drop-down list under Perform Device Operation, select Force Configuration Synchronization.
Step 4 Click Submit.
The device configuration is synchronized with the DPE.
Device Deployment in Cisco BAC
A Cisco BAC deployment is divided into provisioning groups, with each provisioning group responsible
only for a subset of the devices. All services provided by the provisioning group are implemented to
provide fault tolerance.
Note A key principle of device management is that the RDU does not directly communicate with
devices. All device interactions are delegated to DPEs in the provisioning group to which the
device belongs.