vLan 16: 10.20.16.0/24
vLan 80: 192.168.80.0/24
int vlan 16
ip access-group 116 in
ip access-group 126 out
access-list 116 permit ip 10.20.16.0 0.0.0.255 192.168.80.0 0.0.0.255
access-list 126 permit ip 192.168.80.0 0.0.0.255 10.20.16.0 0.0.0.255
Remark: Source address and then Destination address