Scott Moser has proposed merging 
~smoser/cloud-init:fix/1836949-mtu-lost-in-translation into cloud-init:master.

Commit message:
Fix bug rendering MTU on bond or vlan when input was netplan.

If input to network_state.parse_net_config_data was netplan (v2 yaml)
then the network state would lose the mtu information on bond or vlan.

LP: #1836949

Requested reviews:
  Server Team CI bot (server-team-bot): continuous-integration
  cloud-init commiters (cloud-init-dev)
Related bugs:
  Bug #1836949 in cloud-init: "mtu gets lost in translation from netplan (v2) 
yaml"
  https://bugs.launchpad.net/cloud-init/+bug/1836949

For more details, see:
https://code.launchpad.net/~smoser/cloud-init/+git/cloud-init/+merge/370280

see commit message
-- 
Your team cloud-init commiters is requested to review the proposed merge of 
~smoser/cloud-init:fix/1836949-mtu-lost-in-translation into cloud-init:master.
diff --git a/cloudinit/net/network_state.py b/cloudinit/net/network_state.py
index 3702130..0ca576b 100644
--- a/cloudinit/net/network_state.py
+++ b/cloudinit/net/network_state.py
@@ -673,6 +673,8 @@ class NetworkStateInterpreter(object):
                 'vlan_id': cfg.get('id'),
                 'vlan_link': cfg.get('link'),
             }
+            if 'mtu' in cfg:
+                vlan_cmd['mtu'] = cfg['mtu']
             subnets = self._v2_to_v1_ipcfg(cfg)
             if len(subnets) > 0:
                 vlan_cmd.update({'subnets': subnets})
@@ -722,6 +724,8 @@ class NetworkStateInterpreter(object):
                 'params': dict((v2key_to_v1[k], v) for k, v in
                                item_params.get('parameters', {}).items())
             }
+            if 'mtu' in item_cfg:
+                v1_cmd['mtu'] = item_cfg['mtu']
             subnets = self._v2_to_v1_ipcfg(item_cfg)
             if len(subnets) > 0:
                 v1_cmd.update({'subnets': subnets})
diff --git a/tests/unittests/test_net.py b/tests/unittests/test_net.py
index de4e7f4..e2bbb84 100644
--- a/tests/unittests/test_net.py
+++ b/tests/unittests/test_net.py
@@ -2856,6 +2856,97 @@ USERCTL=no
         self._compare_files_to_expected(entry['expected_sysconfig'], found)
         self._assert_headers(found)
 
+    def test_from_v2_vlan_mtu(self):
+        """verify mtu gets rendered on bond when source is netplan."""
+        v2data = {
+            'version': 2,
+            'ethernets': {'eno1': {}},
+            'vlans': {
+                'eno1.1000': {
+                    'addresses': ["192.6.1.9/24"],
+                    'id': 1000, 'link': 'eno1', 'mtu': 1495}}}
+        expected = {
+            'ifcfg-eno1': textwrap.dedent("""\
+                BOOTPROTO=none
+                DEVICE=eno1
+                NM_CONTROLLED=no
+                ONBOOT=yes
+                STARTMODE=auto
+                TYPE=Ethernet
+                USERCTL=no
+                """),
+            'ifcfg-eno1.1000': textwrap.dedent("""\
+                BOOTPROTO=none
+                DEVICE=eno1.1000
+                IPADDR=192.6.1.9
+                MTU=1495
+                NETMASK=255.255.255.0
+                NM_CONTROLLED=no
+                ONBOOT=yes
+                PHYSDEV=eno1
+                STARTMODE=auto
+                TYPE=Ethernet
+                USERCTL=no
+                VLAN=yes
+                """)
+            }
+        self._compare_files_to_expected(
+            expected, self._render_and_read(network_config=v2data))
+
+    def test_from_v2_bond_mtu(self):
+        """verify mtu gets rendered on bond when source is netplan."""
+        v2data = {
+            'version': 2,
+            'bonds': {
+                'bond0': {'addresses': ['10.101.8.65/26'],
+                          'interfaces': ['enp0s0', 'enp0s1'],
+                          'mtu': 1334,
+                          'parameters': {}}}
+        }
+        expected = {
+            'ifcfg-bond0': textwrap.dedent("""\
+                BONDING_MASTER=yes
+                BONDING_SLAVE0=enp0s0
+                BONDING_SLAVE1=enp0s1
+                BOOTPROTO=none
+                DEVICE=bond0
+                IPADDR=10.101.8.65
+                MTU=1334
+                NETMASK=255.255.255.192
+                NM_CONTROLLED=no
+                ONBOOT=yes
+                STARTMODE=auto
+                TYPE=Bond
+                USERCTL=no
+                """),
+            'ifcfg-enp0s0': textwrap.dedent("""\
+                BONDING_MASTER=yes
+                BOOTPROTO=none
+                DEVICE=enp0s0
+                MASTER=bond0
+                NM_CONTROLLED=no
+                ONBOOT=yes
+                SLAVE=yes
+                STARTMODE=auto
+                TYPE=Bond
+                USERCTL=no
+                """),
+            'ifcfg-enp0s1': textwrap.dedent("""\
+                BONDING_MASTER=yes
+                BOOTPROTO=none
+                DEVICE=enp0s1
+                MASTER=bond0
+                NM_CONTROLLED=no
+                ONBOOT=yes
+                SLAVE=yes
+                STARTMODE=auto
+                TYPE=Bond
+                USERCTL=no
+                """)
+        }
+        self._compare_files_to_expected(
+            expected, self._render_and_read(network_config=v2data))
+
 
 class TestOpenSuseSysConfigRendering(CiTestCase):
 
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