Cisco Catalyst 4500 Series Configuration Guide

61-5
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 61 Configuring NetFlow-lite
Configuring NetFlow Packet Sampling
Example
This example shows how to configure sampling parameters and to display the sampler configuration:
Switch# config terminal
Switch(config)# netflow-lite sampler sampler1
Switch(config-netflow-lite-sampler)# packet-rate 32
Switch(config-netflow-lite-sampler)# packet-section size 128
Switch(config-netflow-lite-sampler)# packet-offset 16
Switch(config-netflow-lite-sampler)# exit
Switch(config)# exit
Switch#
Switch# show netflow-lite sampler sampler1
Netflow-lite Sampler sampler1:
Id : 1
Packet Sampling rate: 1 out of 32
Packet Section Size: 64 bytes
Packet offset: 16 bytes
You can verify your settings with the show netflow-lite sampler privileged EXEC command
Usage Guidelines
The packet sampling rate can range from 32 to 2^15 in powers of 2. To troubleshoot two 1 Gigabit ports,
a rate of 1 is allowed. This is equivalent to rx span only. It cannot be configured on 10 Gigabit ports
because the bandwidth demand for export will be too high.
Mandatory parameters are packet rate. A maximum of 2 x 1Gigabit ports can be configured with 1-in-1
sampling. The best packet sampling rate that can be configured on any 1 Gigabit or 10 Gigabit port is
1-in-32. Packet sampling rates can be configured in powers of 2 (like 1-in-64 and 1-in-128).
You can update a sampler at a target interface, but you cannot remove or unconfigure mandatory
parameters.
All mandatory parameters must be present to validate a sampler. Any unspecified non-mandatory
parameters take on default values.
Activating Sampling on an Interface or VLAN
This task defines a monitor instance on an interface or VLAN, identifying the sampler and exporter to
use.
Step 5
Switch(config-netflow-lite-sampler)# packet-offset
offset
Specifies a starting packet offset in NetFlow-lite
submode.
Step 6
Switch(config-netflow-lite-sampler)# exit
Exits NetFlow-lite sampler submode.
Step 7
Switch(config)# exit
Exits global configuration mode.
Step 8
Switch# show netflow-lite sampler sampler
Displays information about a sampler.
Command Purpose

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E