Default Nde Configuration - Cisco 7609 Configuration Manual
Cisco ios software configuration guide—12.1e
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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
78-14064-04
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.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
Export Interval (Milliseconds)
4096
4096
4096
4096
4096
8192
16384
32768
Default Value
Disabled
None
None
None
Disabled
Disabled
Default NDE Configuration
33-7
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