HPE FlexNetwork 5510 HI Series Network Management And Monitoring Configuration Manual page 215

Table 23 RPC methods
RPC method
Get
Set
Inform
Download
Upload
Reboot
Autoconnect between ACS and CPE
The CPE connects to the ACS automatically after it obtains the DNS server address and basic ACS
parameters (ACS URL and authentication username and password). You can configure this
information manually on the CPE, through a DHCP server, or through the ACS.
After establishing a connection, the ACS can issue configuration and software images to the CPE. If
the connection is disconnected before a session is complete, the CPE retries the failed connection
automatically. The retry attempt continues until the connection is established again or the specified
retry limit is reached.
Depending on the configuration, the CPE can also connect to the ACS regularly or at a scheduled
time to update its information with the ACS.
NOTE:
For the CPE to complete autoconfiguration at its initial startup, use a DHCP server as a best
practice. The DHCP option for ACS parameter assignment is option 43. For more information about
DHCP, see Layer 3—IP Services Configuration Guide.
CWMP connection establishment
As shown in
1. After obtaining the basic ACS parameters, the CPE initiates a TCP connection to the ACS.
2. If HTTPS is used, the CPE and the ACS initialize SSL for a secure HTTP connection.
3. The CPE sends an Inform message in HTTPS to initiate a CWMP session.
4. After the CPE passes authentication, the ACS returns an Inform response to establish the
session.
5. After sending all requests, the CPE sends an empty HTTP post message.
6. If the ACS wants to point the CPE to a new ACS URL, the ACS queries the ACS URL set on the
CPE.
7. The CPE replies with its ACS URL setting.
8. The ACS sends a Set request to modify the ACS URL on the CPE.
9. After the ACS URL is modified, the CPE sends a response.
10. The ACS sends an empty HTTP message to notify the CPE that it has no other requests.
11. The CPE closes the connection, and then initiates a new connection to the new ACS URL.
Description
The ACS obtains the values of parameters on the CPE.
The ACS modifies the values of parameters on the CPE.
The CPE sends an Inform message to the ACS for the following purposes:
•
Initiates a connection to the ACS.
•
Reports configuration changes to the ACS.
•
Periodically updates CPE settings to the ACS.
The ACS requires the CPE to download a configuration or software image file from a
specific URL for software or configuration update.
The ACS requires the CPE to upload a file to a specific URL.
The ACS reboots the CPE remotely for the CPE to complete an upgrade or recover
from an error condition.
Figure 2, the CPE and the ACS use the following process to establish a connection:
206