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Chapter 8
Raw Data Formatting: The RDR Formatter and NetFlow Exporting
Priority
The priority value is used to indicate whether the destination should be a destination for a given category.
Priority is related to the redundant forwarding mode, in that it indicates which is the primary active
connection. Priority values have no effect in multicast forwarding mode.
Each destination is assigned a priority value for each category. The first destination that is configured is
automatically assigned a priority of 100 (highest priority) for all categories, unless explicitly defined
otherwise.
Following are some important points to keep in mind regarding priority values:
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Setting DSCP for NetFlow
When using the NetFlowV9 protocol, priority can be defined by configuring a DSCP value to be assigned
to the NetFlow packets. This DSCP value defines the DiffServ level of the NetFlow traffic to all
destinations.
Forwarding Modes
When more than one destination is defined for a category, the system must decide which of these
destinations is to receive the data. This is determined by the forwarding mode. There are three
forwarding modes:
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Some types of deployments using the NetFlow protocol require multicast forwarding mode. In a
Note
deployment where there are multiple destinations for at least one category, and at least one of those is a
NetFlow destination, the multicast forwarding mode must be configured.
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Two destinations may not have the same priority for one category. The priority values for
destinations within a category must be unique to have any meaning.
If only one priority value is assigned to the destination, that priority is automatically assigned to all
categories for that destination.
If only one category is assigned a priority value for a destination, no RDRs from the other categories
will be sent to the specified destination.
Assign a high priority if data from the specified category should be sent to this destination. Assign
a low priority if data from the specified category should less likely to be sent to this destination.
Redundant forwarding mode — Assign a high priority to the primary destination for the
system/category. Assign a lower priority to the secondary destination for the system/category.
Redundancy — All records are sent only to the primary (active) connection. If the primary
connection fails, the records will be sent to the connected destination with the next highest priority.
Multicast — All records are sent to all destinations. This feature may negatively affect performance
in an installation with a high rate of data.
Simple load balancing — Each successive record is sent to a different destination, one destination
after the other, in a round robin manner. It is the responsibility of the collectors to aggregate the
records.
If one connection fails, the contents of the history buffer are sent to all connected destinations.
Information About the RDR Formatter and NetFlow Exporting Support
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
8-5
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