Active And Standby Acs Switchover - HP 5820X Switch Configuration Manual

Active and standby ACS switchover

The following example illustrates how an active and standby ACS switchover is performed. The scenario:
There are two ACSs, active and standby in an area. The active ACS needs to restart for system upgrade.
To ensure a continuous monitoring of the CPE, all CPEs in the area must connect to the standby ACS.
Figure 46 Example of the message interaction during an active and standby ACS switchover
The active and standby ACS switchover proceeds as follows:
Establish a TCP connection.
1.
SSL initialization, and establish a security connection.
2.
The CPE sends an Inform request message to initiate a CWMP connection. The Inform message
3.
carries the reason for sending this message in the Eventcode field. In this example, the reason is "6
CONNECTION REQUEST", indicating that the ACS requires the CPE to establish a connection.
If the CPE passes the authentication of the ACS, the ACS returns an Inform response, and the
4.
connection is established.
Receiving the Inform response, the CPE sends an empty message, if it has no other requests. The
5.
CPE does this in order to comply with the request/reply interaction model of HTTP, in which CWMP
messages are conveyed.
The ACS queries the value of the ACS URL set on the CPE.
6.
The CPE replies to the ACS with the obtained value of the ACS URL.
7.
The ACS finds that its local URL value is the same as the value of the ACS URL on the CPE.
8.
Therefore, the ACS sends a Set request to the CPE to modify the ACS URL value of the CPE to the
URL of the standby ACS.
The setting succeeds and the CPE sends a response.
9.
The ACS sends an empty message to notify the CPE that it does not request for any other
10.
information from the CPE.
The CPE closes the connection.
11.
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