How A Failure Is Detected - Cisco 4116 - EtherFast Switch Design Manual

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available encoder ports (8 or 12) on the failover ISP. More than one ISP may be
configured as a failover ISP for any number of primary ISPs.
◦
The Cisco Stream Manager Administration and Monitoring with Failover Module. This
Windows-based software provides system health information, including information about
server and bandwidth use of all Cisco Video Surveillance devices in a network, and
central alarm capabilities. The Administration and Monitoring with Failover Module
initiates a failover when either a single encoder port or an entire ISP fails, redirecting
video streams to a failover ISP. The module also maintains a history log of failure events.
●
Third-party equipment:
◦
A supported matrix switch (see Table 6 on Page 4-1) with available monitor output ports.
The monitor output ports are connected to the encoder ports of the ISP and become
active when a failure is detected. The number of available monitor output ports must be
equal to or greater than the number of video streams to be backed up.
◦
A serial cable to connect the matrix switch to the failover ISP. For more detailed
information about matrix switches, see the "Manufacturer-Specific Configurations"
chapter. One serial cable can support failover for more than one failover ISP.
◦
A CCTV keyboard that is dedicated to selecting video streams and requesting digital
playback features.
To minimize the potential affect of power failures when using redundant devices, follow traditional
networking designs and use several electrical circuits.

How a Failure is Detected

The Administration and Monitoring with Failover Module must be active and able to reach all ISPs
that are in the environment, including the failover ISP. When the Administration and Monitoring with
Failover Module detects a failure on an ISP, it polls the affected device three times, and then
redirects the video streams to the failover ISP. The refresh interval for polling is a system-wide
configuration option on the Stream Manager Administration and Monitoring with Failover Module,
and may be changed from the default value.
Figure 14 shows a deployment in which ISP_3 is dedicated as a failover ISP and records video
streams if a failure occurs.
Design Guide
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