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Figure 14.
Failover Scenario
The following events take place if ISP_2 fails:
1.
The Administration and Monitoring with Failover Module sends discovery request messages
every five seconds to maintain a list of available Cisco Stream Manager video surveillance
devices on the network. If a device does not respond to these discovery requests, the
Administration and Monitoring with Failover Module waits three times longer than the refresh
interval before logging a failure. The default refresh interval is 60 seconds, but this value may
be configured as shown on Page 5-17. When the system logs a failure, it displays a notification
on the Administration and Monitoring screen and generates an audible alert.
2.
The Administration and Monitoring with Failover Module sends a discovery request for
available failover ISPs. ISP_3 responds and specifies the number of free channels that it has
available for failover recording.
3.
The Administration and Monitoring with Failover Module informs the failover ISP which video
streams need to be recorded. A new message is sent every three seconds with details on
which port to back up, until the failover ISP reports that there are no longer free channels for
recording.
4.
Through the serial cable between the matrix switch and the failover ISP_3, ISP_3 instructs the
matrix switch to redirect video streams to the output ports that are reserved for failover.
5.
The redirected video streams are recorded on the failover ISP.
6.
If an operator requests video playback during a failure, the retrieval steps are the same as
Step 1 through Step 6 that accompany Figure 12 on Page 2-8. These steps explain how video
is retrieved from ISP_3.
Note:
If the data converter was connected to ISP_2, recording on the failover ISP would still take
place, but an operator would not be able to request playback video by using that keyboard. An
Design Guide
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