Here's a general guideline to configure sFlow on a supported Cisco Catalyst switch, such as the Catalyst 2960L and Catalyst 1000:
Access the switch CLI
Connect to your Cisco Catalyst switch via SSH or a console cable. If connecting via SSH, use a tool like PuTTY or the built-in SSH client in your terminal, and enter the switch's IP address, username, and password to log in.
Enter global configuration mode
Once logged in, enter global configuration mode by typing the following command:
Configure sFlow settings
To configure sFlow settings, including the IP address and port of the remote flow collector, use the following commands:
sflow collector id ID ip x.x.x.x udp-port yyyy datagram-size zzzz
ID with the ID of this collector definition,
x.x.x.x with the IP address of your sFlow collector,
yyyy with the desired port number for the sFlow collector (e.g.,
zzzz with the maximum size, in bytes, of the UDP datagram containing sFlow records that is allowed to be sent (e.g.,
1280 for 1280 bytes).
Configure sFlow agent IP address
To set the sFlow agent IP address, use the following command:
sflow agent ip x.x.x.x
x.x.x.x with the IP address to be used as the sFlow agent IP address.
Enable sFlow on interfaces
To enable sFlow on the desired interfaces, use the following commands:
sflow flow-sampling DIRECTION id ID rate yyyy hdr-size zzzz
INTERFACE_NAME with the name of the interface for which you want to enable sFlow (e.g.,
DIRECTION with the direction of traffic,
output, that is to be sampled,
ID with the ID of the collector definition to which the sFlow records are to be sent,
yyyy with the sampling rate (e.g.,
1024 for 1 in 1024 packets), and
zzzz with the number of bytes to included from the sampled IP packet.
This step should be repeated for all interfaces for which sFlow sampling is desired.
Save the configuration
To save your configuration changes, exit global configuration mode and use the following command:
copy running-config startup-config
Verify the configuration
To verify that sFlow is configured correctly, use the following command:
This command should display the sFlow settings you just configured. For example:
IP : 192.0.2.11
Max number of collectors : 2
Id | Collector IP | Port | Max Datagram size
1 | 192.168.100.10 | 6343 | 1280
Please note that these instructions may not apply to all Cisco Catalyst switches, as sFlow support varies between models. Ensure that your specific switch model supports sFlow before attempting to configure it.