[Enterprise SONiC] SFLOW (sampled flow) Follow

SFLOW(sampled flow), Network packet information is acquired by sampling so that the network administrator can understand the operation status of the network.

Tested model & firmware version:

• Switch model name:

       AS7326-56X

       AS4630-54PE

• Edgecore SONiC version: 

202006.4

202012.2

• It only supports two sFlow collectors.
• Default
  • Default SFLOW is disabled
  • Default polling interval is 20 s
  • Default sample rate is one-tenth of port speed
  • Default agent id is eth0
  • Default UDP port is 6343
• The sFlow flow sampling is not taken effect unless you set the COPP rule correctly.Since 202006.1, there is the COPP rule configuration by default.

Procedure:

Step 1: Make sure the COPP rule is correct in the SWSS container.

Access the SWSS container.

admin@sonic:~$ docker exec -it swss bash
root@sonic:/#

Checking the copp.json.j2, this file is at /usr/share/sonic/templates.

[
omitted...
   {
        "COPP_TABLE:trap.group.sflow": {
            "trap_ids": "sample_packet",
            "trap_action":"trap",
            "trap_priority":"1",
            "queue": "2",
            "meter_type":"packets",
            "mode":"sr_tcm",
            "cir":"1000",
            "cbs":"1000",
            "red_action":"drop",
            "genetlink_name":"psample",
            "genetlink_mcgrp_name":"packets"
         },
         "OP": "SET"
    }
]

Caution:

• If you modify the copp.json.j2, please reboot the switch to activate it.
• After 202006.1, please skip this step.

Step 2: Configure the IP address on the Ethernet0 ( refer to Management IP address)

Step 3: Enable the sFlow.

admin@sonic:~$ sudo config sflow enable

Step 4: Add the sFlow collector.

admin@sonic:~$ sudo config sflow collector add test 192.168.2.2

admin@sonic:~$ show sflow

sFlow Global Information:
  sFlow Admin State:          up
  sFlow Polling Interval:     default
  sFlow AgentID:              default

  1 Collectors configured:
    Name: test                IP addr: 192.168.2.2UDP port: 6343

admin@sonic:~$ show sflow interface

sFlow interface configurations
+-------------+---------------+-----------------+
| Interface   | Admin State   |   Sampling Rate |
+=============+===============+=================+
| Ethernet0   | up            |            2500 |
+-------------+---------------+-----------------+
omitted...
+-------------+---------------+-----------------+
| Ethernet76  | up            |           10000 |
+-------------+---------------+-----------------+
admin@sonic:~$ show interfaces status
  Interface            Lanes    Speed    MTU    FEC    Alias    Vlan    Oper    Admin             Type    Asym PFC
-----------  ---------------  -------  -----  -----  -------  ------  ------  -------  ---------------  ----------
  Ethernet0                3      25G   9100   none   Eth5/3  routed    down       up              N/A         N/A
  omitted...
  Ethernet76  125,126,127,128     100G  9100   none  Eth56/1  routed    down       up              N/A         N/A