Cisco 4116 - EtherFast Switch Design Manual page 38

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Figure 38 shows the Failover tab with configuration settings that cause the Administration and
Monitoring with Failover Module to detect single port failures or a missing ISP.
Figure 38. Failover Settings
Note:
The Video Loss setting is useful for detecting a failure of the cable that connects to the
ISP. If a camera fails, the video loss alarm triggers and a failover occurs. Because the camera does
not produce video images, no video is recorded.
The refresh interval can be changed in the Network tab. The Stream Manager Administration and
Monitoring with Failover Module dynamically discovers available devices and continuously monitors
for failures. The Administration and Monitoring with Failover Module attempts to reach each device
three times before determining that a failure has occurred.
With the default refresh Interval of 60 seconds, it can take up to 180 seconds before the failover
ISP begins recording streams. The minimum refresh Interval is 10 seconds, but a setting of 20
seconds is recommended for most environments for efficient use of bandwidth. In Figure 39, the
Administration and Monitoring with Failover Module has been configured with a refresh interval of
20 seconds. In this case, approximately 60 seconds of video is lost while the failover process takes
place.
The Administration and Monitoring with Failover Module can be configured to monitor only devices
with IP addresses within a specific range. In the first example of Figure 39, all devices are
monitored. In the second example of Figure 39, only devices with IP addresses in the range of
10.94.165.1 through 10.94.165.100 range are monitored.
Figure 39. Network Settings and Monitoring Range
Design Guide
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