Cisco Cisco IOS Software Release 12.2(27)SBC
NetFlow PXF Timers
Restrictions for NetFlow PXF Timers
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Configuring NetFlow PXF Timers
Restrictions for NetFlow PXF Timers
Configuration of the NetFlow PXF timers is not supported for customer use without Cisco Technical
Assistance Center (TAC) authorization.
Assistance Center (TAC) authorization.
Information About NetFlow PXF Timers
NetFlow identifies packet flows for both ingress and egress IP packets. It does not involve any
connection-setup protocol, either between routers or to any other networking device or end station.
NetFlow does not require any change externally to the packets themselves or to any networking device.
NetFlow is completely transparent to the existing network, including end stations and application
software and network devices such as LAN switches.
connection-setup protocol, either between routers or to any other networking device or end station.
NetFlow does not require any change externally to the packets themselves or to any networking device.
NetFlow is completely transparent to the existing network, including end stations and application
software and network devices such as LAN switches.
The NetFlow PXF timers are used to ensure that there is a constant flow record in the live Cisco IOS
NetFlow cache to view using the command-line interface (CLI). The NetFlow PXF timers are aging
timers. If the router does not receive packets belonging to a packet flow for a configured period of
seconds, the flow expires and is removed from the live Cisco IOS NetFlow cache.
NetFlow cache to view using the command-line interface (CLI). The NetFlow PXF timers are aging
timers. If the router does not receive packets belonging to a packet flow for a configured period of
seconds, the flow expires and is removed from the live Cisco IOS NetFlow cache.
To configure the NetFlow PXF timers, use the service netflow timeout command in global configuration
mode. If you configure the timers, the router does not retain your settings on PXF or Performance Routing
Engine (PRE) reloads. On PXF and PRE reloads, the active timeout reverts to 60 seconds and the inactive
timeout to 15 seconds.
mode. If you configure the timers, the router does not retain your settings on PXF or Performance Routing
Engine (PRE) reloads. On PXF and PRE reloads, the active timeout reverts to 60 seconds and the inactive
timeout to 15 seconds.
We recommend that the active timeout value be larger than the inactive timeout value. Also, we
recommend that you do not configure the inactive timeout lower than 15 seconds to prevent the sending
of excessive flow records from the PXF to the Route Processor (RP).
recommend that you do not configure the inactive timeout lower than 15 seconds to prevent the sending
of excessive flow records from the PXF to the Route Processor (RP).
How to Configure NetFlow PXF Timers
To configure NetFlow PXF timers, perform the following configuration task:
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Configuring NetFlow PXF Timers
Use the procedure below to configure the timeout settings for active and inactive flow entries in the
NetFlow cache on the Cisco 10000 series router. The service netflow timeout command has no default
behavior or values.
NetFlow cache on the Cisco 10000 series router. The service netflow timeout command has no default
behavior or values.
Note
Configuration of the NetFlow PXF timers is not supported for customer use without Cisco Technical
Assistance Center (TAC) authorization.
Assistance Center (TAC) authorization.