show phase 2 status up/down fortigate 200F v7.4.8

Not sure what kind of device's output this is. But to see the phase2 SA status, you can do either:
    get vpn ipsec tunnel name [phase1_name]

or
    diag  vpn tunnel list name [phase1_name]

Both basically have the same info like network selectors, status, other key parameters after negotiation, etc., like below:

fg40f-utm (root) # get vpn ipsec tun name SFOviaCentu

gateway
name: 'DEMO-VPN'
local-gateway: x.x.x.x:0 (static)
remote-gateway: y.y.y.y:0 (static)
status: up
mode: ike-v2
interface: 'ppp3' (50) vrf:0
rx packets: 82 bytes: 9115 errors: 0
tx packets: 156 bytes: 20914 errors: 0
dpd: on-idle/negotiated status:ok idle: 30000ms retry: 3 count: 0
selectors
  name: 'DEMO-VPN1'
  auto-negotiate: disable
  mode: tunnel
  src: 0:0.0.0.0/0.0.0.0:0
  dst: 0:0.0.0.0/0.0.0.0:0
  SA
    lifetime/rekey: 43200/38306
    mtu: 1422
    tx-esp-seq: 9d
    replay: enabled
    qat: 0
    inbound
      spi: 1970346c
      enc: aes-cb 4f2b84d0b26a641b919430d101a1980ff9571d6affe6179c8d066cd1ec6d9a13
      auth: sha256 6e4abef734db713a5ff15bd26b58b28623468c2af2ff7bd8bde952f100b8359c
    outbound
      spi: 089313d0
      enc: aes-cb fd1d6006bdf368ce5ceed56e815ced17637ef97b1cd39efce7b3abe9128d35ac
      auth: sha256 234c68a2efc64a180c41b5db104616defd71bab21fbc6f6ec3e95e768a1fc379
    NPU acceleration: none

But if a specific phase2(network-selector pair) is not up, it would show without SA info like below because SA is not established:
....

  selectors
      name: 'DEMO-PH2-4'
      auto-negotiate: disable
      mode: tunnel
      src: 0:172.17.0.0/255.255.0.0:0
      dst: 0:10.10.10.10:0

    selectors   (<--SA info starts here instead if tunnel is up)

....

Toshi

The second phase2 selector is not up (10.131.88.222 <> 192.168.20.0). Most often this is because the other side doesn't accept it, or the policy on your side.

@esa12 

If your phase2 is flapping, try to run IKE debug should give us more information why 

dia de reset 

dia de dis 

diagnose vpn ike log-filter clear
diagnose vpn ike log-filter rem-addr4 <remote IP address>
diagnose debug application ike -1
diagnose debug enable

Now wait a bit time when you see phase2 up and down again, stop the debug using below 

dia de dis 

dia de reset 

upload the output here