Default Nde Configuration - Cisco 6500 Series Software Configuration Manual

Chapter 33 Configuring NDE
You can configure sampled NetFlow to use time-based sampling or packet-based sampling.
Table 33-5
Table 33-5 Time-Based Sampling Rates, Sampling Times, and Export Intervals
Sampling Rate
1 in 64
1 in 128
1 in 256
1 in 512
1 in 1024
1 in 2048
1 in 4096
1 in 8192
As examples, if you configure 64 as the rate, then every 4096 milliseconds the sampled NetFlow feature
uses traffic from the first 64 milliseconds of a flow; if the rate is 2048, then every 8192 milliseconds, the
sampled NetFlow feature uses traffic from the first 4 milliseconds of a flow. With time-based sampled
NetFlow, the export interval is not configurable.
Packet-based sampled NetFlow uses this formula to sample a flow: the numer of times sampled is
approximately the length divided by the rate (packets_in_flow/sampling_rate). For example, if the flow
is 32,768 packets long and the sampling rate is 1024, the flow is sampled approximately 32 times
(32,768/1,024). With packet-based sampled NetFlow, the export interval is configurable.

Default NDE Configuration

Table 33-6
Table 33-6 Default NetFlow Data Export Configuration
Feature
NDE
NDE source addresses
NDE data collector address and UDP port
NDE filters
Sampled NetFlow
Populating additional NDE fields
78-14099-04
lists the time-based sampling rates and export intervals.
Sampling Time (Milliseconds)
64
32
16
8
4
4
4
4
shows the default NDE configuration.
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
Export Interval (Milliseconds)
4096
4096
4096
4096
4096
8192
16384
32768
Default Value
Disabled
None
None
None
Disabled
Disabled
Default NDE Configuration
33-7