Setup lagg0 and capture on the receive direction
```
ifconfig lagg0 create laggproto lacp laggport cxl0 laggport cxl1
ifconfig cxl0 up
ifconfig cxl1 up
tcpdump -nvi lagg0 --direction in
```
Verify the output. Should see incoming packets but not those are LACP PDUs when one or both lagg port is/are active.