#9 Viper_SC_Manual_001-5008-000_Rev12e.docx | Page 84
Figure 68 – Network ManagementNeighbor Table
4.8.1 NEIGHBOR DISCOVERY
Select Manual/Auto/Disabled. Default = Manual-Scan. There are three modes of operation. This mode must be configured
the same for every Viper in the network.
― Manual-SCAN. Viper starts in the “Ready” state. In the “Ready” state, the unit is quiet (no neighbor discovery control
messages are sent). If the user presses the “Force Scan” button, the unit goes into the “Scanning for Neighbors” state.
If other units are in the "Scanning for Neighbors" state, the unit will automatically be triggered to go into the "Scanning
for Neighbors" state. In the "Scanning for Neighbors" state, the Viper SC is learning about other units and the other
units are learning about this unit. The unit goes from the "Scanning for Neighbors" state to the "Saving Neighbor Table"
state when it doesn’t learn anything new for a given amount of time. In the "Saving Neighbor Table" state, the content
of the neighbor table is saved in nvram (nonvolatile ram). If the unit reboots, the content of the neighbor table is
restored from the nvram. The unit goes from the "Saving Neighbor Table" state to the "Ready" state. This mode is
recommended for most projects.
― Auto-SCAN. Viper begins "Scanning for Neighbors". In the "Scanning for Neighbors" state, Viper discovers other Viper
units in the network and other Viper SC units learn about the Viper SC initiating the scan. Viper goes from "Scanning for
Neighbors" state to "Ready" state when it doesn’t discover another Viper SC for a given amount of time. In "Ready"
state, Viper SC will generate a “keep alive” packet periodically. In "Ready" state, Viper SC performs broken link
detection. Viper SC is monitoring the “keep alive” packets of other Viper SCs (1 hop away). Viper SC knows the interval
period for other Viper SCs generating their “keep alive” packets. If Viper SC (A) fails to receive four “keep alive” packets
in a row from Viper SC (B), Viper SC (A) removes Viper SC (B) from its neighbor table and goes into the "Scanning for
Neighbors" state. If a user presses the “Force Scan” button, Viper SC goes into the "Scanning for Neighbors" state. If
other Viper SCs are in the "Scanning for Neighbors" state, Viper SC will automatically go into "Scanning for Neighbors"
state. Note: Care should be taken when selecting Auto-Scan mode for the permanent operating mode of a Viper SC
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