1-in-1000 for a 1G link
1-in-10,000 for a 10G link
1-in-40,000 for a 40G link
1-in-50,000 for a 50G link
1-in-100,000 for a 100G linksFlow (sampled flow)
sFlow (defined in https://sflow.org/sflow_version_5.txt) is a standard-based sampling technology the meets the key requirements of network traffic monitoring on switches and routers.
sFlow is an industry standard, low cost and scalable technique that enables a single analyzer to provide a network wide view.
Example model & SONiC version:
- Aurora 615/715
- Netberg SONiC: sonic-202012-nb-inno-211121
SONiC only supports two sFlow collectors.
Defaults:
- SFLOW is disabled
- polling interval is 20 s
- agent id is eth0
- UDP port is 6343
The default sample rate based on interface speed is:
Enable sFlow:
admin@sonic:~$ sudo config sflow enable
admin@sonic:~$ sudo config sflow interface enable Ethernet32 |
Sometimes may result in error: |
Failed to enable unit: Unit file /etc/systemd/system/sflow.service is masked.Fix:
sudo systemctl unmask sflow >/dev/null
sudo systemctl enable sflow
sudo systemctl start sflowAdd an sFlow collector.
admin@sonic:~$ sudo config sflow collector add sFlow 192.168.10.2Check the result:
admin@sonic:~$ show sflow
sFlow Global Information:
sFlow Admin State: up
sFlow Polling Interval: 20
sFlow AgentID: loopback0
1 Collectors configured:
Name: sFlow IP addr: 192.168.10.2 UDP port: 6343 VRF: default
admin@sonic:~$ show sflow interface
sFlow interface configurations
+-------------+---------------+-----------------+
| Interface | Admin State | Sampling Rate |
+=============+===============+=================+
| Ethernet32 | up | 100000 |
+-------------+---------------+-----------------+