Cisco 4116 - EtherFast Switch Design Manual page 64

Cisco video surveillance hybrid design guide
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4.
The TCP session closes and the Administration and Monitoring with Failover Module waits for
three seconds.
5.
After three seconds, the Administration and Monitoring with Failover Module opens a new
session with ISP_3 using the failover port (TCP port 4117) and transmits the camera ID of the
next camera to be backed up. This step is repeated until all failed ports are backed up or until
the available failover ISP ports are exhausted. If a second ISP is configured in failover mode,
the Administration and Monitoring with Failover Module assigns ports in a round-robin fashion
to all available failover ISPs.
While the video streams are backed up, video playback or export requests operate as explained in
the "TCP/UDP Ports Required for Video Playback" section.
When the failure is restored, the following steps occur:
1.
During its normal device discovery steps, the Administration and Monitoring with Failover
Module receives a response from ISP_2 and recognizes that ISP_2 has been restored.
2.
The Administration and Monitoring with Failover Module starts a new TCP session (TCP port
4117) with ISP_3 to communicate that the first port is now operational and to stop recording on
the first monitor output port.
3.
The failover ISP, ISP_3, instructs the matrix switch to stop sending video on the monitor output
port and stops recording on that port.
4.
The Administration and Monitoring with Failover Module waits for three seconds and repeats
Step 2 and Step 3 until all ports are recovered.
Design Guide
IV
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