Add bridge field to Interface, VMInterface models

netbox/dcim/api/serializers.py

@@ -605,6 +605,7 @@ class InterfaceSerializer(PrimaryModelSerializer, LinkTerminationSerializer, Con
     device = NestedDeviceSerializer()
     type = ChoiceField(choices=InterfaceTypeChoices)
     parent = NestedInterfaceSerializer(required=False, allow_null=True)
+    bridge = NestedInterfaceSerializer(required=False, allow_null=True)
     lag = NestedInterfaceSerializer(required=False, allow_null=True)
     mode = ChoiceField(choices=InterfaceModeChoices, allow_blank=True, required=False)
     rf_role = ChoiceField(choices=WirelessRoleChoices, required=False, allow_null=True)
@@ -622,8 +623,8 @@ class InterfaceSerializer(PrimaryModelSerializer, LinkTerminationSerializer, Con
     class Meta:
         model = Interface
         fields = [
-            'id', 'url', 'display', 'device', 'name', 'label', 'type', 'enabled', 'parent', 'lag', 'mtu', 'mac_address',
+            'id', 'url', 'display', 'device', 'name', 'label', 'type', 'enabled', 'parent', 'bridge', 'lag', 'mtu',
-            'wwn', 'mgmt_only', 'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency',
+            'mac_address', 'wwn', 'mgmt_only', 'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency',
             'rf_channel_width', 'untagged_vlan', 'tagged_vlans', 'mark_connected', 'cable', 'link_peer',
             'link_peer_type', 'connected_endpoint', 'connected_endpoint_type', 'connected_endpoint_reachable', 'tags',
             'custom_fields', 'created', 'last_updated', 'count_ipaddresses', '_occupied',

netbox/dcim/api/views.py

@@ -544,7 +544,7 @@ class PowerOutletViewSet(PathEndpointMixin, ModelViewSet):
 
 class InterfaceViewSet(PathEndpointMixin, ModelViewSet):
     queryset = Interface.objects.prefetch_related(
-        'device', 'parent', 'lag', '_path__destination', 'cable', '_link_peer', 'ip_addresses', 'tags'
+        'device', 'parent', 'bridge', 'lag', '_path__destination', 'cable', '_link_peer', 'ip_addresses', 'tags'
     )
     serializer_class = serializers.InterfaceSerializer
     filterset_class = filtersets.InterfaceFilterSet

netbox/dcim/filtersets.py

@@ -975,6 +975,11 @@ class InterfaceFilterSet(PrimaryModelFilterSet, DeviceComponentFilterSet, CableT
         queryset=Interface.objects.all(),
         label='Parent interface (ID)',
     )
+    bridge_id = django_filters.ModelMultipleChoiceFilter(
+        field_name='bridge',
+        queryset=Interface.objects.all(),
+        label='Bridged interface (ID)',
+    )
     lag_id = django_filters.ModelMultipleChoiceFilter(
         field_name='lag',
         queryset=Interface.objects.all(),

netbox/dcim/forms/bulk_edit.py

@@ -939,8 +939,8 @@ class PowerOutletBulkEditForm(
 
 class InterfaceBulkEditForm(
     form_from_model(Interface, [
-        'label', 'type', 'parent', 'lag', 'mac_address', 'wwn', 'mtu', 'mgmt_only', 'mark_connected', 'description',
+        'label', 'type', 'parent', 'bridge', 'lag', 'mac_address', 'wwn', 'mtu', 'mgmt_only', 'mark_connected',
-        'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency', 'rf_channel_width',
+        'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency', 'rf_channel_width',
     ]),
     BootstrapMixin,
     AddRemoveTagsForm,
@@ -964,6 +964,10 @@ class InterfaceBulkEditForm(
         queryset=Interface.objects.all(),
         required=False
     )
+    bridge = DynamicModelChoiceField(
+        queryset=Interface.objects.all(),
+        required=False
+    )
     lag = DynamicModelChoiceField(
         queryset=Interface.objects.all(),
         required=False,
@@ -991,7 +995,7 @@ class InterfaceBulkEditForm(
 
     class Meta:
         nullable_fields = [
-            'label', 'parent', 'lag', 'mac_address', 'wwn', 'mtu', 'description', 'mode', 'rf_channel',
+            'label', 'parent', 'bridge', 'lag', 'mac_address', 'wwn', 'mtu', 'description', 'mode', 'rf_channel',
             'rf_channel_frequency', 'rf_channel_width', 'untagged_vlan', 'tagged_vlans',
         ]
 
@@ -1000,8 +1004,9 @@ class InterfaceBulkEditForm(
         if 'device' in self.initial:
             device = Device.objects.filter(pk=self.initial['device']).first()
 
-            # Restrict parent/LAG interface assignment by device
+            # Restrict parent/bridge/LAG interface assignment by device
             self.fields['parent'].widget.add_query_param('device_id', device.pk)
+            self.fields['bridge'].widget.add_query_param('device_id', device.pk)
             self.fields['lag'].widget.add_query_param('device_id', device.pk)
 
             # Limit VLAN choices by device
@@ -1029,6 +1034,8 @@ class InterfaceBulkEditForm(
 
             self.fields['parent'].choices = ()
             self.fields['parent'].widget.attrs['disabled'] = True
+            self.fields['bridge'].choices = ()
+            self.fields['bridge'].widget.attrs['disabled'] = True
             self.fields['lag'].choices = ()
             self.fields['lag'].widget.attrs['disabled'] = True
 

netbox/dcim/forms/bulk_import.py

@@ -570,6 +570,12 @@ class InterfaceCSVForm(CustomFieldModelCSVForm):
         to_field_name='name',
         help_text='Parent interface'
     )
+    bridge = CSVModelChoiceField(
+        queryset=Interface.objects.all(),
+        required=False,
+        to_field_name='name',
+        help_text='Bridged interface'
+    )
     lag = CSVModelChoiceField(
         queryset=Interface.objects.all(),
         required=False,
@@ -594,39 +600,11 @@ class InterfaceCSVForm(CustomFieldModelCSVForm):
     class Meta:
         model = Interface
         fields = (
-            'device', 'name', 'label', 'parent', 'lag', 'type', 'enabled', 'mark_connected', 'mac_address', 'wwn',
+            'device', 'name', 'label', 'parent', 'bridge', 'lag', 'type', 'enabled', 'mark_connected', 'mac_address',
-            'mtu', 'mgmt_only', 'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency',
+            'wwn', 'mtu', 'mgmt_only', 'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency',
             'rf_channel_width',
         )
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
-        # Limit LAG choices to interfaces belonging to this device (or virtual chassis)
-        device = None
-        if self.is_bound and 'device' in self.data:
-            try:
-                device = self.fields['device'].to_python(self.data['device'])
-            except forms.ValidationError:
-                pass
-        if device and device.virtual_chassis:
-            self.fields['lag'].queryset = Interface.objects.filter(
-                Q(device=device) | Q(device__virtual_chassis=device.virtual_chassis),
-                type=InterfaceTypeChoices.TYPE_LAG
-            )
-            self.fields['parent'].queryset = Interface.objects.filter(
-                Q(device=device) | Q(device__virtual_chassis=device.virtual_chassis)
-            )
-        elif device:
-            self.fields['lag'].queryset = Interface.objects.filter(
-                device=device,
-                type=InterfaceTypeChoices.TYPE_LAG
-            )
-            self.fields['parent'].queryset = Interface.objects.filter(device=device)
-        else:
-            self.fields['lag'].queryset = Interface.objects.none()
-            self.fields['parent'].queryset = Interface.objects.none()
-
     def clean_enabled(self):
         # Make sure enabled is True when it's not included in the uploaded data
         if 'enabled' not in self.data:

netbox/dcim/forms/models.py

@@ -1093,6 +1093,11 @@ class InterfaceForm(BootstrapMixin, InterfaceCommonForm, CustomFieldModelForm):
         required=False,
         label='Parent interface'
     )
+    bridge = DynamicModelChoiceField(
+        queryset=Interface.objects.all(),
+        required=False,
+        label='Bridged interface'
+    )
     lag = DynamicModelChoiceField(
         queryset=Interface.objects.all(),
         required=False,
@@ -1143,8 +1148,8 @@ class InterfaceForm(BootstrapMixin, InterfaceCommonForm, CustomFieldModelForm):
     class Meta:
         model = Interface
         fields = [
-            'device', 'name', 'label', 'type', 'enabled', 'parent', 'lag', 'mac_address', 'wwn', 'mtu', 'mgmt_only',
+            'device', 'name', 'label', 'type', 'enabled', 'parent', 'bridge', 'lag', 'mac_address', 'wwn', 'mtu',
-            'mark_connected', 'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency',
+            'mgmt_only', 'mark_connected', 'description', 'mode', 'rf_role', 'rf_channel', 'rf_channel_frequency',
             'rf_channel_width', 'wireless_lans', 'untagged_vlan', 'tagged_vlans', 'tags',
         ]
         widgets = {
@@ -1168,13 +1173,14 @@ class InterfaceForm(BootstrapMixin, InterfaceCommonForm, CustomFieldModelForm):
 
         device = Device.objects.get(pk=self.data['device']) if self.is_bound else self.instance.device
 
-        # Restrict parent/LAG interface assignment by device/VC
+        # Restrict parent/bridge/LAG interface assignment by device/VC
         self.fields['parent'].widget.add_query_param('device_id', device.pk)
+        self.fields['bridge'].widget.add_query_param('device_id', device.pk)
+        self.fields['lag'].widget.add_query_param('device_id', device.pk)
         if device.virtual_chassis and device.virtual_chassis.master:
-            # Get available LAG interfaces by VirtualChassis master
+            self.fields['parent'].widget.add_query_param('device_id', device.virtual_chassis.master.pk)
+            self.fields['bridge'].widget.add_query_param('device_id', device.virtual_chassis.master.pk)
             self.fields['lag'].widget.add_query_param('device_id', device.virtual_chassis.master.pk)
-        else:
-            self.fields['lag'].widget.add_query_param('device_id', device.pk)
 
         # Limit VLAN choices by device
         self.fields['untagged_vlan'].widget.add_query_param('available_on_device', device.pk)

netbox/dcim/forms/object_create.py

@@ -446,6 +446,13 @@ class InterfaceCreateForm(ComponentCreateForm, InterfaceCommonForm):
             'device_id': '$device',
         }
     )
+    bridge = DynamicModelChoiceField(
+        queryset=Interface.objects.all(),
+        required=False,
+        query_params={
+            'device_id': '$device',
+        }
+    )
     lag = DynamicModelChoiceField(
         queryset=Interface.objects.all(),
         required=False,
@@ -497,7 +504,7 @@ class InterfaceCreateForm(ComponentCreateForm, InterfaceCommonForm):
         required=False
     )
     field_order = (
-        'device', 'name_pattern', 'label_pattern', 'type', 'enabled', 'parent', 'lag', 'mtu', 'mac_address',
+        'device', 'name_pattern', 'label_pattern', 'type', 'enabled', 'parent', 'bridge', 'lag', 'mtu', 'mac_address',
         'description', 'mgmt_only', 'mark_connected', 'rf_role', 'rf_channel', 'rf_channel_frequency',
         'rf_channel_width', 'mode', 'untagged_vlan', 'tagged_vlans', 'tags'
     )

netbox/dcim/migrations/0134_interface_wwn.py

@@ -1,17 +0,0 @@
-import dcim.fields
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('dcim', '0133_port_colors'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='interface',
-            name='wwn',
-            field=dcim.fields.WWNField(blank=True, null=True),
-        ),
-    ]

netbox/dcim/migrations/0134_interface_wwn_bridge.py

@@ -0,0 +1,23 @@
+import dcim.fields
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dcim', '0133_port_colors'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='interface',
+            name='wwn',
+            field=dcim.fields.WWNField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='interface',
+            name='bridge',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='bridge_interfaces', to='dcim.interface'),
+        ),
+    ]

netbox/dcim/migrations/0135_tenancy_extensions.py

@@ -6,7 +6,7 @@ class Migration(migrations.Migration):
 
     dependencies = [
         ('tenancy', '0002_tenant_ordering'),
-        ('dcim', '0134_interface_wwn'),
+        ('dcim', '0134_interface_wwn_bridge'),
     ]
 
     operations = [

netbox/dcim/models/device_components.py

@@ -462,6 +462,22 @@ class BaseInterface(models.Model):
         choices=InterfaceModeChoices,
         blank=True
     )
+    parent = models.ForeignKey(
+        to='self',
+        on_delete=models.SET_NULL,
+        related_name='child_interfaces',
+        null=True,
+        blank=True,
+        verbose_name='Parent interface'
+    )
+    bridge = models.ForeignKey(
+        to='self',
+        on_delete=models.SET_NULL,
+        related_name='bridge_interfaces',
+        null=True,
+        blank=True,
+        verbose_name='Bridge interface'
+    )
 
     class Meta:
         abstract = True
@@ -495,14 +511,6 @@ class Interface(ComponentModel, BaseInterface, LinkTermination, PathEndpoint):
         max_length=100,
         blank=True
     )
-    parent = models.ForeignKey(
-        to='self',
-        on_delete=models.SET_NULL,
-        related_name='child_interfaces',
-        null=True,
-        blank=True,
-        verbose_name='Parent interface'
-    )
     lag = models.ForeignKey(
         to='self',
         on_delete=models.SET_NULL,
@@ -586,7 +594,7 @@ class Interface(ComponentModel, BaseInterface, LinkTermination, PathEndpoint):
         related_query_name='interface'
     )
 
-    clone_fields = ['device', 'parent', 'lag', 'type', 'mgmt_only']
+    clone_fields = ['device', 'parent', 'bridge', 'lag', 'type', 'mgmt_only']
 
     class Meta:
         ordering = ('device', CollateAsChar('_name'))
@@ -610,6 +618,16 @@ class Interface(ComponentModel, BaseInterface, LinkTermination, PathEndpoint):
                 'mark_connected': f"{self.get_type_display()} interfaces cannot be marked as connected."
             })
 
+        # Parent validation
+
+        # An interface cannot be its own parent
+        if self.pk and self.parent_id == self.pk:
+            raise ValidationError({'parent': "An interface cannot be its own parent."})
+
+        # A physical interface cannot have a parent interface
+        if self.type != InterfaceTypeChoices.TYPE_VIRTUAL and self.parent is not None:
+            raise ValidationError({'parent': "Only virtual interfaces may be assigned to a parent interface."})
+
         # An interface's parent must belong to the same device or virtual chassis
         if self.parent and self.parent.device != self.device:
             if self.device.virtual_chassis is None:
@@ -623,13 +641,34 @@ class Interface(ComponentModel, BaseInterface, LinkTermination, PathEndpoint):
                               f"is not part of virtual chassis {self.device.virtual_chassis}."
                 })
 
-        # An interface cannot be its own parent
+        # Bridge validation
-        if self.pk and self.parent_id == self.pk:
-            raise ValidationError({'parent': "An interface cannot be its own parent."})
 
-        # A physical interface cannot have a parent interface
+        # An interface cannot be bridged to itself
-        if self.type != InterfaceTypeChoices.TYPE_VIRTUAL and self.parent is not None:
+        if self.pk and self.bridge_id == self.pk:
-            raise ValidationError({'parent': "Only virtual interfaces may be assigned to a parent interface."})
+            raise ValidationError({'bridge': "An interface cannot be bridged to itself."})
+
+        # A bridged interface belong to the same device or virtual chassis
+        if self.bridge and self.bridge.device != self.device:
+            if self.device.virtual_chassis is None:
+                raise ValidationError({
+                    'bridge': f"The selected bridge interface ({self.bridge}) belongs to a different device "
+                              f"({self.bridge.device})."
+                })
+            elif self.bridge.device.virtual_chassis != self.device.virtual_chassis:
+                raise ValidationError({
+                    'bridge': f"The selected bridge interface ({self.bridge}) belongs to {self.bridge.device}, which "
+                              f"is not part of virtual chassis {self.device.virtual_chassis}."
+                })
+
+        # LAG validation
+
+        # A virtual interface cannot have a parent LAG
+        if self.type == InterfaceTypeChoices.TYPE_VIRTUAL and self.lag is not None:
+            raise ValidationError({'lag': "Virtual interfaces cannot have a parent LAG interface."})
+
+        # A LAG interface cannot be its own parent
+        if self.pk and self.lag_id == self.pk:
+            raise ValidationError({'lag': "A LAG interface cannot be its own parent."})
 
         # An interface's LAG must belong to the same device or virtual chassis
         if self.lag and self.lag.device != self.device:
@@ -643,13 +682,7 @@ class Interface(ComponentModel, BaseInterface, LinkTermination, PathEndpoint):
                            f"of virtual chassis {self.device.virtual_chassis}."
                 })
 
-        # A virtual interface cannot have a parent LAG
+        # Wireless validation
-        if self.type == InterfaceTypeChoices.TYPE_VIRTUAL and self.lag is not None:
-            raise ValidationError({'lag': "Virtual interfaces cannot have a parent LAG interface."})
-
-        # A LAG interface cannot be its own parent
-        if self.pk and self.lag_id == self.pk:
-            raise ValidationError({'lag': "A LAG interface cannot be its own parent."})
 
         # RF role & channel may only be set for wireless interfaces
         if self.rf_role and not self.is_wireless:
@@ -679,11 +712,13 @@ class Interface(ComponentModel, BaseInterface, LinkTermination, PathEndpoint):
         elif self.rf_channel:
             self.rf_channel_width = get_channel_attr(self.rf_channel, 'width')
 
+        # VLAN validation
+
         # Validate untagged VLAN
         if self.untagged_vlan and self.untagged_vlan.site not in [self.device.site, None]:
             raise ValidationError({
-                'untagged_vlan': "The untagged VLAN ({}) must belong to the same site as the interface's parent "
+                'untagged_vlan': f"The untagged VLAN ({self.untagged_vlan}) must belong to the same site as the "
-                                 "device, or it must be global".format(self.untagged_vlan)
+                                 f"interface's parent device, or it must be global."
             })
 
     @property

netbox/dcim/tables/devices.py

@@ -521,8 +521,10 @@ class DeviceInterfaceTable(InterfaceTable):
         attrs={'td': {'class': 'text-nowrap'}}
     )
     parent = tables.Column(
-        linkify=True,
+        linkify=True
-        verbose_name='Parent'
+    )
+    bridge = tables.Column(
+        linkify=True
     )
     lag = tables.Column(
         linkify=True,
@@ -537,10 +539,10 @@ class DeviceInterfaceTable(InterfaceTable):
     class Meta(DeviceComponentTable.Meta):
         model = Interface
         fields = (
-            'pk', 'name', 'label', 'enabled', 'type', 'parent', 'lag', 'mgmt_only', 'mtu', 'mode', 'mac_address', 'wwn',
+            'pk', 'name', 'label', 'enabled', 'type', 'parent', 'bridge', 'lag', 'mgmt_only', 'mtu', 'mode',
-            'rf_role', 'rf_channel', 'rf_channel_width', 'description', 'mark_connected', 'cable', 'cable_color',
+            'mac_address', 'wwn', 'rf_role', 'rf_channel', 'rf_channel_width', 'description', 'mark_connected', 'cable',
-            'wireless_link', 'wireless_lans', 'link_peer', 'connection', 'tags', 'ip_addresses', 'untagged_vlan',
+            'cable_color', 'wireless_link', 'wireless_lans', 'link_peer', 'connection', 'tags', 'ip_addresses',
-            'tagged_vlans', 'actions',
+            'untagged_vlan', 'tagged_vlans', 'actions',
         )
         order_by = ('name',)
         default_columns = (

netbox/templates/dcim/interface.html

@@ -69,6 +69,16 @@
                                 {% endif %}
                             </td>
                         </tr>
+                        <tr>
+                            <th scope="row">Bridge</th>
+                            <td>
+                                {% if object.bridge %}
+                                    <a href="{{ object.bridge.get_absolute_url }}">{{ object.bridge }}</a>
+                                {% else %}
+                                    <span class="text-muted">None</span>
+                                {% endif %}
+                            </td>
+                        </tr>
                         <tr>
                             <th scope="row">LAG</th>
                             <td>

netbox/templates/dcim/interface_edit.html

@@ -18,6 +18,7 @@
         {% render_field form.label %}
         {% render_field form.type %}
         {% render_field form.parent %}
+        {% render_field form.bridge %}
         {% render_field form.lag %}
         {% render_field form.mac_address %}
         {% render_field form.wwn %}

netbox/templates/virtualization/vminterface.html

@@ -47,6 +47,16 @@
                             {% endif %}
                         </td>
                     </tr>
+                    <tr>
+                        <th scope="row">Bridge</th>
+                        <td>
+                            {% if object.bridge %}
+                                <a href="{{ object.bridge.get_absolute_url }}">{{ object.bridge }}</a>
+                            {% else %}
+                                <span class="text-muted">None</span>
+                            {% endif %}
+                        </td>
+                    </tr>
                     <tr>
                         <th scope="row">Description</th>
                         <td>{{ object.description|placeholder }} </td>

netbox/templates/virtualization/vminterface_edit.html

@@ -17,6 +17,7 @@
       {% render_field form.name %}
       {% render_field form.enabled %}
       {% render_field form.parent %}
+      {% render_field form.bridge %}
       {% render_field form.mac_address %}
       {% render_field form.mtu %}
       {% render_field form.description %}

netbox/virtualization/api/serializers.py

@@ -107,6 +107,7 @@ class VMInterfaceSerializer(PrimaryModelSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='virtualization-api:vminterface-detail')
     virtual_machine = NestedVirtualMachineSerializer()
     parent = NestedVMInterfaceSerializer(required=False, allow_null=True)
+    bridge = NestedVMInterfaceSerializer(required=False, allow_null=True)
     mode = ChoiceField(choices=InterfaceModeChoices, allow_blank=True, required=False)
     untagged_vlan = NestedVLANSerializer(required=False, allow_null=True)
     tagged_vlans = SerializedPKRelatedField(
@@ -120,8 +121,8 @@ class VMInterfaceSerializer(PrimaryModelSerializer):
     class Meta:
         model = VMInterface
         fields = [
-            'id', 'url', 'display', 'virtual_machine', 'name', 'enabled', 'parent', 'mtu', 'mac_address', 'description',
+            'id', 'url', 'display', 'virtual_machine', 'name', 'enabled', 'parent', 'bridge', 'mtu', 'mac_address',
-            'mode', 'untagged_vlan', 'tagged_vlans', 'tags', 'custom_fields', 'created', 'last_updated',
+            'description', 'mode', 'untagged_vlan', 'tagged_vlans', 'tags', 'custom_fields', 'created', 'last_updated',
             'count_ipaddresses',
         ]
 

netbox/virtualization/filtersets.py

@@ -264,6 +264,11 @@ class VMInterfaceFilterSet(PrimaryModelFilterSet):
         queryset=VMInterface.objects.all(),
         label='Parent interface (ID)',
     )
+    bridge_id = django_filters.ModelMultipleChoiceFilter(
+        field_name='bridge',
+        queryset=VMInterface.objects.all(),
+        label='Bridged interface (ID)',
+    )
     mac_address = MultiValueMACAddressFilter(
         label='MAC address',
     )

netbox/virtualization/forms/bulk_edit.py

@@ -165,6 +165,10 @@ class VMInterfaceBulkEditForm(BootstrapMixin, AddRemoveTagsForm, CustomFieldMode
         queryset=VMInterface.objects.all(),
         required=False
     )
+    bridge = DynamicModelChoiceField(
+        queryset=VMInterface.objects.all(),
+        required=False
+    )
     enabled = forms.NullBooleanField(
         required=False,
         widget=BulkEditNullBooleanSelect()
@@ -195,7 +199,7 @@ class VMInterfaceBulkEditForm(BootstrapMixin, AddRemoveTagsForm, CustomFieldMode
 
     class Meta:
         nullable_fields = [
-            'parent', 'mtu', 'description',
+            'parent', 'bridge', 'mtu', 'description',
         ]
 
     def __init__(self, *args, **kwargs):
@@ -203,8 +207,9 @@ class VMInterfaceBulkEditForm(BootstrapMixin, AddRemoveTagsForm, CustomFieldMode
         if 'virtual_machine' in self.initial:
             vm_id = self.initial.get('virtual_machine')
 
-            # Restrict parent interface assignment by VM
+            # Restrict parent/bridge interface assignment by VM
             self.fields['parent'].widget.add_query_param('virtual_machine_id', vm_id)
+            self.fields['bridge'].widget.add_query_param('virtual_machine_id', vm_id)
 
             # Limit VLAN choices by virtual machine
             self.fields['untagged_vlan'].widget.add_query_param('available_on_virtualmachine', vm_id)
@@ -231,6 +236,11 @@ class VMInterfaceBulkEditForm(BootstrapMixin, AddRemoveTagsForm, CustomFieldMode
                     self.fields['untagged_vlan'].widget.add_query_param('site_id', site.pk)
                     self.fields['tagged_vlans'].widget.add_query_param('site_id', site.pk)
 
+            self.fields['parent'].choices = ()
+            self.fields['parent'].widget.attrs['disabled'] = True
+            self.fields['bridge'].choices = ()
+            self.fields['bridge'].widget.attrs['disabled'] = True
+
 
 class VMInterfaceBulkRenameForm(BulkRenameForm):
     pk = forms.ModelMultipleChoiceField(

netbox/virtualization/forms/bulk_import.py

@@ -104,6 +104,18 @@ class VMInterfaceCSVForm(CustomFieldModelCSVForm):
         queryset=VirtualMachine.objects.all(),
         to_field_name='name'
     )
+    parent = CSVModelChoiceField(
+        queryset=VMInterface.objects.all(),
+        required=False,
+        to_field_name='name',
+        help_text='Parent interface'
+    )
+    bridge = CSVModelChoiceField(
+        queryset=VMInterface.objects.all(),
+        required=False,
+        to_field_name='name',
+        help_text='Bridged interface'
+    )
     mode = CSVChoiceField(
         choices=InterfaceModeChoices,
         required=False,
@@ -113,7 +125,7 @@ class VMInterfaceCSVForm(CustomFieldModelCSVForm):
     class Meta:
         model = VMInterface
         fields = (
-            'virtual_machine', 'name', 'enabled', 'mac_address', 'mtu', 'description', 'mode',
+            'virtual_machine', 'name', 'parent', 'bridge', 'enabled', 'mac_address', 'mtu', 'description', 'mode',
         )
 
     def clean_enabled(self):

netbox/virtualization/forms/models.py

@@ -277,6 +277,11 @@ class VMInterfaceForm(BootstrapMixin, InterfaceCommonForm, CustomFieldModelForm)
         required=False,
         label='Parent interface'
     )
+    bridge = DynamicModelChoiceField(
+        queryset=VMInterface.objects.all(),
+        required=False,
+        label='Bridged interface'
+    )
     vlan_group = DynamicModelChoiceField(
         queryset=VLANGroup.objects.all(),
         required=False,
@@ -306,8 +311,8 @@ class VMInterfaceForm(BootstrapMixin, InterfaceCommonForm, CustomFieldModelForm)
     class Meta:
         model = VMInterface
         fields = [
-            'virtual_machine', 'name', 'enabled', 'parent', 'mac_address', 'mtu', 'description', 'mode', 'tags',
+            'virtual_machine', 'name', 'parent', 'bridge', 'enabled', 'mac_address', 'mtu', 'description', 'mode',
-            'untagged_vlan', 'tagged_vlans',
+            'tags', 'untagged_vlan', 'tagged_vlans',
         ]
         widgets = {
             'virtual_machine': forms.HiddenInput(),
@@ -326,6 +331,7 @@ class VMInterfaceForm(BootstrapMixin, InterfaceCommonForm, CustomFieldModelForm)
 
         # Restrict parent interface assignment by VM
         self.fields['parent'].widget.add_query_param('virtual_machine_id', vm_id)
+        self.fields['bridge'].widget.add_query_param('virtual_machine_id', vm_id)
 
         # Limit VLAN choices by virtual machine
         self.fields['untagged_vlan'].widget.add_query_param('available_on_virtualmachine', vm_id)

netbox/virtualization/forms/object_create.py

@@ -35,6 +35,13 @@ class VMInterfaceCreateForm(BootstrapMixin, CustomFieldsMixin, InterfaceCommonFo
             'virtual_machine_id': '$virtual_machine',
         }
     )
+    bridge = DynamicModelChoiceField(
+        queryset=VMInterface.objects.all(),
+        required=False,
+        query_params={
+            'virtual_machine_id': '$virtual_machine',
+        }
+    )
     mac_address = forms.CharField(
         required=False,
         label='MAC Address'
@@ -61,7 +68,7 @@ class VMInterfaceCreateForm(BootstrapMixin, CustomFieldsMixin, InterfaceCommonFo
         required=False
     )
     field_order = (
-        'virtual_machine', 'name_pattern', 'enabled', 'parent', 'mtu', 'mac_address', 'description', 'mode',
+        'virtual_machine', 'name_pattern', 'enabled', 'parent', 'bridge', 'mtu', 'mac_address', 'description', 'mode',
         'untagged_vlan', 'tagged_vlans', 'tags'
     )
 

netbox/virtualization/migrations/0026_vminterface_bridge.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.8 on 2021-10-21 20:26
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('virtualization', '0025_extend_tag_support'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='vminterface',
+            name='bridge',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='bridge_interfaces', to='virtualization.vminterface'),
+        ),
+    ]

netbox/virtualization/models.py

@@ -378,14 +378,6 @@ class VMInterface(PrimaryModel, BaseInterface):
         max_length=200,
         blank=True
     )
-    parent = models.ForeignKey(
-        to='self',
-        on_delete=models.SET_NULL,
-        related_name='child_interfaces',
-        null=True,
-        blank=True,
-        verbose_name='Parent interface'
-    )
     untagged_vlan = models.ForeignKey(
         to='ipam.VLAN',
         on_delete=models.SET_NULL,
@@ -423,6 +415,12 @@ class VMInterface(PrimaryModel, BaseInterface):
     def clean(self):
         super().clean()
 
+        # Parent validation
+
+        # An interface cannot be its own parent
+        if self.pk and self.parent_id == self.pk:
+            raise ValidationError({'parent': "An interface cannot be its own parent."})
+
         # An interface's parent must belong to the same virtual machine
         if self.parent and self.parent.virtual_machine != self.virtual_machine:
             raise ValidationError({
@@ -430,15 +428,26 @@ class VMInterface(PrimaryModel, BaseInterface):
                           f"({self.parent.virtual_machine})."
             })
 
-        # An interface cannot be its own parent
+        # Bridge validation
-        if self.pk and self.parent_id == self.pk:
+
-            raise ValidationError({'parent': "An interface cannot be its own parent."})
+        # An interface cannot be bridged to itself
+        if self.pk and self.bridge_id == self.pk:
+            raise ValidationError({'bridge': "An interface cannot be bridged to itself."})
+
+        # A bridged interface belong to the same virtual machine
+        if self.bridge and self.bridge.virtual_machine != self.virtual_machine:
+            raise ValidationError({
+                'bridge': f"The selected bridge interface ({self.bridge}) belongs to a different virtual machine "
+                          f"({self.bridge.virtual_machine})."
+            })
+
+        # VLAN validation
 
         # Validate untagged VLAN
         if self.untagged_vlan and self.untagged_vlan.site not in [self.virtual_machine.site, None]:
             raise ValidationError({
                 'untagged_vlan': f"The untagged VLAN ({self.untagged_vlan}) must belong to the same site as the "
-                                 f"interface's parent virtual machine, or it must be global"
+                                 f"interface's parent virtual machine, or it must be global."
             })
 
     def to_objectchange(self, action):

netbox/virtualization/tables.py

@@ -166,9 +166,6 @@ class VMInterfaceTable(BaseInterfaceTable):
     name = tables.Column(
         linkify=True
     )
-    parent = tables.Column(
-        linkify=True
-    )
     tags = TagColumn(
         url_name='virtualization:vminterface_list'
     )
@@ -176,13 +173,19 @@ class VMInterfaceTable(BaseInterfaceTable):
     class Meta(BaseTable.Meta):
         model = VMInterface
         fields = (
-            'pk', 'name', 'virtual_machine', 'enabled', 'parent', 'mac_address', 'mtu', 'mode', 'description', 'tags',
+            'pk', 'name', 'virtual_machine', 'enabled', 'mac_address', 'mtu', 'mode', 'description', 'tags',
             'ip_addresses', 'untagged_vlan', 'tagged_vlans',
         )
-        default_columns = ('pk', 'name', 'virtual_machine', 'enabled', 'parent', 'description')
+        default_columns = ('pk', 'name', 'virtual_machine', 'enabled', 'description')
 
 
 class VirtualMachineVMInterfaceTable(VMInterfaceTable):
+    parent = tables.Column(
+        linkify=True
+    )
+    bridge = tables.Column(
+        linkify=True
+    )
     actions = ButtonsColumn(
         model=VMInterface,
         buttons=('edit', 'delete'),
@@ -192,8 +195,8 @@ class VirtualMachineVMInterfaceTable(VMInterfaceTable):
     class Meta(BaseTable.Meta):
         model = VMInterface
         fields = (
-            'pk', 'name', 'enabled', 'mac_address', 'mtu', 'mode', 'description', 'tags', 'ip_addresses',
+            'pk', 'name', 'enabled', 'parent', 'bridge', 'mac_address', 'mtu', 'mode', 'description', 'tags',
-            'untagged_vlan', 'tagged_vlans', 'actions',
+            'ip_addresses', 'untagged_vlan', 'tagged_vlans', 'actions',
         )
         default_columns = (
             'pk', 'name', 'enabled', 'mac_address', 'mtu', 'mode', 'description', 'ip_addresses', 'actions',