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[Scott Moser <ssmoser2+ubuntu@xxxxxxxxx>]

** Changed in: nplan (Ubuntu)
   Importance: Undecided => Medium

** Changed in: nplan (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: nplan (Ubuntu Artful)
   Importance: Undecided => Medium

** Also affects: cloud-init
   Importance: Undecided
       Status: New

** Changed in: cloud-init
       Status: New => Confirmed

** Changed in: cloud-init
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1735821

Title:
  netplan needs bridge port-priority support

Status in cloud-init:
  Confirmed
Status in nplan package in Ubuntu:
  Fix Released
Status in nplan source package in Xenial:
  Fix Committed
Status in nplan source package in Artful:
  Fix Committed

Bug description:
  [Impact]
  Users of netplan configuring any bridge. Port priority is a very common setting to change when setting up bridge devices that might have multiple interfaces.

  [Test case]
  1) Write a netplan configuration:
  network:
      version: 2
      ethernets:
          eth0:
              match:
                  name: eth0
      bridges:
          br0:
              addresses:
              - 192.168.14.2/24
              interfaces:
              - eth0
              parameters:
                  path-cost:
                      eth0: 50
                  priority: 22
                  port-priority:
                      eth0: 14

  2) Run 'sudo netplan apply'

  3) Validate that the config generated by netplan is correct:

  In /run/systemd/network/10-netplan-eth0.network:

  [...]
  [Bridge]
  [...]
  Priority=14

  4) Validate that the port-priority value for the bridge has been
  correctly set:

  $ cat /sys/class/net/mybr/brif/eth0/priority


  [Regression potential]
  This might impact STP behavior, such that while the port priority for a bridge changes, the general network topology might change -- this may lead to loss of connectivity on the bridge itself or on other devices on the network, invalid packet traffic (packets showing up where they should not), etc.

  ---

  Now that systemd supports port-priority for bridges (LP: #1668347)
  netplan should handle port-priority like it does path-cost.

  1) % lsb_release -rd
  Description:	Ubuntu 16.04.3 LTS
  Release:	16.04

  1) # lsb_release -rd
  Description:	Ubuntu Bionic Beaver (development branch)
  Release:	18.04

  2) # apt-cache policy nplan
  nplan:
    Installed: 0.30
    Candidate: 0.32
    Version table:
       0.32 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
   *** 0.30 100
          100 /var/lib/dpkg/status

  3) netplan generate renders a networkd .network file which has
  [Bridge] section including  Priority  value set on each of the bridge
  ports specified

  4) netplan fails to parse the input yaml with

  Sample config that should parse:

  % cat br-pp.yaml
  network:
      version: 2
      ethernets:
          eth0:
              match:
                  macaddress: '52:54:00:12:34:04'
      bridges:
          br0:
              addresses:
              - 192.168.14.2/24
              interfaces:
              - eth0
              parameters:
                  path-cost:
                      eth0: 50
                  priority: 22
                  port-priority:
                      eth0: 14

  % netplan generate
  Error in network definition br-pp.yaml line 13 column 16: unknown key port-priority

  If fixed, then I would expect a /run/systemd/network/10-netplan-eth0.network that looks like
  [Match]
  MACAddress=52:54:00:12:34:00
  Name=eth0

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

  [Bridge]
  Cost=50
  Priority=14

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