As networks become more complex and organizations enable
more applications, traffic patterns become more diverse and unpredictable.
Organizations require better visibility into network traffic in a manageable
way. It is crucial for network operators to obtain information about where,
why, when, how, and by whom specific applications are used and how the usage
might affect the network. This information is vital to enhancing operational
efficiency and optimizing operational costs. Cisco NetFlow technology is one of
the most scalable ways to provide this information throughout your network
infrastructure. NetFlow-Lite introduces traffic visibility on the Cisco 2960X, 2960XR, 2960-CX, and 3560-CX
Series Switches for the first time.
The following steps illustrate NetFlow-Lite configuration on
the Cisco Catalyst 2960-X, 2960-XR,
2960-CX, and 3560-CX Series Switches:
Step
1. Configure
a Flow Record, which defines the data collection. You can customize it for
specific requirements. You can use the following example with most NetFlow
collectors:
flow record v4
match ipv4 tos
match ipv4 protocol
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
collect transport tcp flags
collect interface input
collect flow sampler
collect counter bytes long
collect counter packets long
collect timestamp sys-uptime first
collect timestamp sys-uptime last
Step
2. Configure
a Flow Exporter, which defines where the collected data needs to be sent.
Please refer to the NetFlow collector application user guides and manual for
specific details such as port number, differentiated services code point
(DSCP), and other options. The configuration follows:
flow exporter Replicator
description Exporter to Cisco Prime
2.0
destination 10.2.44.12
source GigabitEthernet1/0/1
dscp 16
template data timeout 60
option interface-table
Step
3. Configure
a Flow Monitor, which binds the flow record and exporter along with options to
configure the flow cache:
flow monitor v4
record v4
exporter Replicator
cache timeout active 30
Step
4. Configure
a Flow Sampler. Define the sampling technique and sample size. The
configuration follows:
sampler v4
mode random 1 out-of 32
Step
5. Attach
the Flow Monitor and Sampler to the interface:
interface GigabitEthernet1/0/1
ip flow monitor v4 sampler v4 input
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