Can't set MTU on ethernet interface using example config

[Evgeniy Sudyr]

From https://github.com/CanonicalLtd/netplan/blob/master/doc/example-config it's not clear how to set mtu for ethernet physical NIC (Intel X710)

I used next config:

network:
  ethernets:
    ens1f0:
      mtu: 9000
      addresses:
        - 192.168.14.2/24
  version: 2

when running *netplan apply* I got no messages and I see that MTU was not changed when I checked with *ip link*

I did reboot and I see that netplan config was not applied (no IP address were set), I removed mtu and run *netplan apply* - it was applied.

I asked in IRC #netplan how to make it working and cyphermox suggested to try match: macaddress to make it working.

I tried and it worked!

Working config:

network:
  ethernets:
    ens1f0:
      match:
        macaddress: ac:1f:6b:8a:xx:xx
      mtu: 9000
      addresses:
        - 192.168.14.2/24
  version: 2