Default Netflow Configuration; Netflow Configuration Guidelines And Restrictions - Cisco 7604 Configuration Manual
Ios software configuration guide
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Chapter 50
Configuring NetFlow
Note the following specific feature conflicts:
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Default NetFlow Configuration
Table 50-2
Table 50-2 Default NetFlow Configuration
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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OL-4266-08
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 MSFC.
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 dest-source-interface flow mask (PFC2) or full-interface flow mask
(PFC2 and PFC3). 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. For systems equipped with a PFC3B or
PFC3BXL, 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.
With PFC2 and above, the CEF table (and not the NetFlow table) implements Layer 3 switching in
hardware.
In PFC3B or PFC3BXL mode with Release 12.2(18)SXE and later releases, NetFlow supports
bridged IP traffic. PFC3A mode does not support NetFlow bridged IP traffic.
In Release 12.2(18)SXF and later releases, 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.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Default Value
Disabled
Disabled
Disabled
Disabled
Table 50-3
Default NetFlow Configuration
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