Ip Route-Cache Flow - Cisco 4500M Command Reference Manual

Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches

ip route-cache flow

To enable NetFlow statistics for IP routing, use the ip route-cache flow command. To disable NetFlow
statistics, use the no form of this command.
Syntax Description
infer-fields
Defaults
NetFlow statistics is disabled.
Inferred information is excluded.
Command Modes
Configuration
Command History Release
12.1(13)EW
12.1(19)EW
Usage Guidelines
To use these commands, you need to install the Supervisor EngineIV and the NetFlow Service Card.
The NetFlow statistics feature captures a set of traffic statistics. These traffic statistics include source IP
address, destination IP address, layer 4 port information, protocol, input and output identifiers, and other
routing information that can be used for network analysis, planning, accounting, billing and identifying
DOS attacks.
NetFlow switching is supported on IP and IP-encapsulated traffic over all interface types.
If you enter ip route-cache flow infer-fields after ip route-cache flow , you will purge the existing
cache, and vice versa. This is done to avoid having flows with and without inferred fields in the cache
simultaneously.
For additional information on NetFlow switching, refer to the Catalyst4500 Series Switch CiscoIOS
Software Configuration Guide .
Note
NetFlow consumes additional memory and CPU resources compared to other switching modes. You
need to know the resources required on your switch before enabling NetFlow.
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ip route-cache flow [infer-fields]
no ip route-cache flow [infer-fields]
(Optional) Includes the NetFlow fields as inferred by the software: Input identifier,
Output identifier, and Routing information.
Modification
Support for this command was introduced on the Catalyst4500 series switches.
Command enhanced to support infer fields.
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
ip route-cache flow
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