NetworkManager is not disabling interfaces

Issue

• Do not want a networking interface NIC to show up as UP on boot or have ip address assignment in the output of

# ip address

• Do not want the networking interface to power the switchport on boot
• Have tried disabling autoconnect but even when the ip address does not show, I still see the interface is UP

# nmcli con mod enp1s0 connection.autoconnect no

• However the interface still comes up on boot even if there is no ip address assigned. Want to completely disable the networking interface.

• Devices are showing UP flag even though there isn't a link on that interface, ethtool as well does not show any link:

eth1      Link encap:Ethernet  HWaddr aa:aa:aa:xx:xx:xx
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1