Public bug reported:

1. root@ubuntu:/run/systemd/network# lsb_release -rd
Description:    Ubuntu Zesty Zapus (development branch)
Release:        17.04

2. root@ubuntu:/run/systemd/network# apt-cache policy systemd
systemd:
  Installed: 232-18ubuntu1
  Candidate: 232-18ubuntu1
  Version table:
 *** 232-18ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu zesty/main amd64 Packages
        100 /var/lib/dpkg/status

3. Using a networkd config like this:

# cat 10-netplan-eth1.network 
[Match]
MACAddress=52:54:00:12:34:02
Name=eth1

[Network]
Bridge=br0
LinkLocalAddressing=no
IPv6AcceptRA=no

[Bridge]
Cost=50
Priority=28

%  cat /sys/class/net/br0/brif/eth1/priority 
28


4. %  cat /sys/class/net/br0/brif/eth1/priority 
32


When using ifupdown and /etc/network/interfaces to configure a bridge
users are able to specify a bridge port priority:

auto br0
iface br0 inet static
  address 192.168.1.1
  bridge_ports eth1 eth2
  bridge_portprio eth1 28
  bridge_portprio eth2 14

Which results in the bridge hook scripts running:

brctl setportprio br0 eth1 28

which is visible via:

/sys/class/net/br0/brif/eth2/priority

Note, networkd does not mention PortPriority under netdev Bridge section,
however, PathCost is mentioned.  It appears networkd is missing an 
implementation.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: systemd 232-18ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-8.10-generic 4.10.0-rc8
Uname: Linux 4.10.0-8-generic x86_64
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
Date: Mon Feb 27 17:11:32 2017
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-8-generic 
root=UUID=900c1e3f-f682-4455-949c-ebdbf60ac6f5 ro console=ttyS0
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.10.1-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-zesty
dmi.modalias: 
dmi:bvnSeaBIOS:bvr1.10.1-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-zesty:cvnQEMU:ct1:cvrpc-i440fx-zesty:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-zesty
dmi.sys.vendor: QEMU

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug curtin uec-images zesty

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https://bugs.launchpad.net/bugs/1668347

Title:
  Unable to set bridge_portpriority with networkd

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