set vpn ipsec authentication psk MY-PEER id '192.0.2.1'
set vpn ipsec authentication psk MY-PEER id '192.0.2.10'
set vpn ipsec authentication psk MY-PEER secret 'SeCrEt'
set vpn ipsec esp-group ESP proposal 1
set vpn ipsec ike-group IKE key-exchange 'ikev2'
set vpn ipsec ike-group IKE lifetime '0'
set vpn ipsec ike-group IKE proposal 1 dh-group '14'
set vpn ipsec ike-group IKE proposal 1 encryption 'aes256'
set vpn ipsec ike-group IKE proposal 1 hash 'sha256'
set vpn ipsec interface 'eth1'
set vpn ipsec site-to-site peer MY-PEER authentication mode 'pre-shared-secret'
set vpn ipsec site-to-site peer MY-PEER ike-group 'IKE'
set vpn ipsec site-to-site peer MY-PEER local-address '192.0.2.1'
set vpn ipsec site-to-site peer MY-PEER remote-address '192.0.2.10'
set vpn ipsec site-to-site peer MY-PEER tunnel 1 esp-group 'ESP'
set vpn ipsec site-to-site peer MY-PEER tunnel 1 local prefix '10.0.2.0/25'
set vpn ipsec site-to-site peer MY-PEER tunnel 1 remote prefix '10.5.5.0/25'

vyos@r14:~$ sudo swanctl -L
MY-PEER: IKEv2, no reauthentication, no rekeying, dpd delay 30s
  local:  192.0.2.1
  remote: 192.0.2.10
  local pre-shared key authentication:
  remote pre-shared key authentication:
    id: %any
  MY-PEER-tunnel-1: TUNNEL, rekeying every 3272s, dpd action is none
    local:  10.0.2.0/25
    remote: 10.5.5.0/25
vyos@r14:~$

vyos@r14:~$ show sflow 
--------------------------  -----------------------------------
Agent address               192.168.122.14
sFlow interfaces            ['eth0', 'eth1']
sFlow servers               ['192.168.122.1', '192.168.122.11']
Counter samples sent        159
Datagrams sent              949
Packet samples sent         124
Packet samples dropped      0
Packet drops sent           815
Packet drops suppressed     0
Flow samples suppressed     0
Counter samples suppressed  0
--------------------------  -----------------------------------
vyos@r14:~$

vyos@r14:~$ show sflow 
--------------------------  -----------------------------------
Agent address               192.168.122.14
sFlow interfaces            ['eth0', 'eth1']
sFlow servers               ['192.168.122.1', '192.168.122.11']
Datagrams sent              306
Packet samples sent         18
Packet samples dropped      0
Counter samples sent        917
Flow samples suppressed     0
Counter samples suppressed  0
--------------------------  -----------------------------------
vyos@r14:~$

vyos@r14:~$ sudo /usr/libexec/vyos/op_mode/sflow.py show --raw
{
    "agent_address": "192.168.122.14",
    "sflow_interfaces": [
        "eth0",
        "eth1"
    ],
    "sflow_servers": [
        "192.168.122.1",
        "192.168.122.11"
    ],
    "counter_samples_sent": 1077,
    "datagrams_sent": 359,
    "packet_samples_dropped": 0,
    "packet_samples_sent": 19,
    "rtmetric_samples": 0,
    "flow_samples_suppressed": 0,
    "counter_samples_suppressed": 0,
    "hsflowd_version": "2.0.50"
}
vyos@r14:~$