To enable sFlow on this switch, you need to make the following configuration changes:
feature sflow sflow sampling-rate 4096 sflow max-sampled-size 128 sflow counter-poll-interval 20 sflow max-datagram-size 1400 sflow counter-poll-interval 30 sflow collector-ip <fastnetmon-IP> vrf default sflow collector-port 6343 sflow agent-ip <rotuer-ip>
You may need to change “default” to “management” to alter VRF.
Please check if your switch supports values smaller than 4096 for sampling-rate, and if it does, change it to 2000 or 1000.
Then you need to add all ports for traffic monitoring:
sflow data-source interface ethernet 1/5
For port channel interfaces syntax will be slightly different:
sflow data-source interface port-channel xxx
You may experience issues with 40G modules, and you will need to change TCAM configuration. We recommend checking vendor guides for this.
To monitor that it works correctly, please use the following command:
show sflow statistics Total Packets : 108379009735 Packets Total Samples : 86338 Packets Processed Samples : 86449 Packets Dropped Samples : 17 Packets Sent Datagrams : 14317 Packets Dropped Datagrams : 5 Packets