NetFlow v9 See Flow Support for details on flow support in Horizon. Netflow v9 UDP Parser The Netflow v9 UDP parser accepts packets received by a UDP listener and must forward them to a Netflow v9 adapter. The Netflow v9 UDP parser supports protocol detection. Facts Class Name org.opennms.netmgt.telemetry.protocols.netflow.parser.Netflow9UdpParser Configuration and use Table 1. Optional parameters for the Netflow v9 UDP parser Parameter Description Default templateTimeout Templates must be redeclared in the given duration or they will be dropped. 30 minutes maxClockSkew The maximum delta in seconds between exporter and Minion timestamps. 0 clockSkewEventRate Used to rate-limit clock skew events in seconds. 3600 dnsLookupsEnabled Used to enable or disable DNS resolution for flows. true sequenceNumberPatience A value > 1 enables checking for sequence number completeness. The value gives the size of the history buffer allowing flows to be processed out of order. 32 flowActiveTimeoutFallback Fallback value for active flow timeout, if value is not included in exported flows. none flowInactiveTimeoutFallback Fallback value for inactive flow timeout, if value is not included in exported flows. none flowSamplingIntervalFallback Fallback value for sampling interval, if value is not included in exported flows. none The parameter maxClockSkew in your parser definition enables clock skew detection for exporters. It specifies the maximum delta in seconds between exporter and Minion timestamps. If exceeded, an alarm will be generated for the exporting device. The default value is 0, so clock skew detection is disabled. Furthermore, you can use the clockSkewEventRate parameter to rate-limit clock skew events. The default is 3600 seconds, so every hour an event will be sent. Netflow v9 Adapter The Netflow v9 adapter handles Netflow v9 payloads received and parsed by by the Netflow v9 UDP Parser. Flows are decoded from the messages into the canonical flow format and are published to the flow repository. Facts Class Name org.opennms.netmgt.telemetry.protocols.netflow.adapter.netflow9.Netflow9Adapter Configuration and use This adapter does not currently have any configurable parameters. NetFlow v5 OpenConfig Telemetry