Default Netflow Configuration; Netflow Configuration Guidelines And Restrictions - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Chapter 47 Configuring NetFlow
Note the following specific feature conflicts:
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Default NetFlow Configuration

Table 47-2
Table 47-2
Feature
NetFlow of routed IP traffic
NetFlow of ingress bridged IP traffic
Sampled NetFlow
NetFlow Aggregation

NetFlow Configuration Guidelines and Restrictions

When configuring NetFlow, follow these guidelines and restrictions:
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Table 47-3
PFC
PFC3B
OL-11439-03
CBAC requires the full flow mask, and is given priority over other flow-based features. If a flow
mask conflict occurs, the other flow-based features are processed in the PISA.
In general, NDE is flexible because you configure the minimum flow mask. If you have configured
other flow-based features, Feature Manager software may set a more specific flow mask to meet all
the feature requirements.
Sampled NetFlow requires the full-interface flow mask. This may cause conflict with other
flow-based features on the same interface.
NDE conflicts with QoS. NDE and QoS microflow policing cannot be configured on the same
interface.
If NAT is configured on a Layer 3 interface with any feature that uses dynamic ACEs (for example,
Web Proxy Authentication or NAC Layer 3 IP validation), trailing fragments may not be NAT
translated correctly if NAT is configured for overload.You can use the mls ip nat
netflow-frag-l4-zero command to ensure that NAT functions correctly in this case.
shows the default NetFlow configuration.
Default NetFlow Configuration
The CEF table (and not the NetFlow table) implements Layer 3 switching in hardware.
NetFlow supports bridged IP traffic.
NetFlow supports multicast IP traffic.
No statistics are available for flows that are switched when the NetFlow table is full.
If the NetFlow table utilization exceeds the recommended utilization levels, there is an increased
probability that there will be insufficient room to store statistics.
maximum utilization levels.
NetFlow Table Utilization
Recommended NetFlow Table Utilization
117,760 (115 K) entries
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
Default Value
Disabled
Disabled
Disabled
Disabled
Table 47-3
Total NetFlow Table Capacity
131,072 (128 K) entries
Default NetFlow Configuration
lists the recommended
47-5