Fixes #4030: Fix exception when setting interfaces to tagged mode in bulk

docs/release-notes/version-2.7.md

@@ -22,6 +22,7 @@
 * [#4025](https://github.com/netbox-community/netbox/issues/4025) - Correct display of cable status (various places)
 * [#4027](https://github.com/netbox-community/netbox/issues/4027) - Repair schema migration for #3569 to convert IP addresses with DHCP status
 * [#4028](https://github.com/netbox-community/netbox/issues/4028) - Correct URL patterns to match Unicode characters in tag slugs
+* [#4030](https://github.com/netbox-community/netbox/issues/4030) - Fix exception when setting interfaces to tagged mode in bulk
 
 ---
 

netbox/dcim/forms.py

@@ -2748,7 +2748,7 @@ class InterfaceCSVForm(forms.ModelForm):
             return self.cleaned_data['enabled']
 
 
-class InterfaceBulkEditForm(InterfaceCommonForm, BootstrapMixin, AddRemoveTagsForm, BulkEditForm):
+class InterfaceBulkEditForm(BootstrapMixin, AddRemoveTagsForm, BulkEditForm):
     pk = forms.ModelMultipleChoiceField(
         queryset=Interface.objects.all(),
         widget=forms.MultipleHiddenInput()
@@ -2829,6 +2829,18 @@ class InterfaceBulkEditForm(InterfaceCommonForm, BootstrapMixin, AddRemoveTagsFo
         else:
             self.fields['lag'].choices = []
 
+    def clean(self):
+
+        # Untagged interfaces cannot be assigned tagged VLANs
+        if self.cleaned_data['mode'] == InterfaceModeChoices.MODE_ACCESS and self.cleaned_data['tagged_vlans']:
+            raise forms.ValidationError({
+                'mode': "An access interface cannot have tagged VLANs assigned."
+            })
+
+        # Remove all tagged VLAN assignments from "tagged all" interfaces
+        elif self.cleaned_data['mode'] == InterfaceModeChoices.MODE_TAGGED_ALL:
+            self.cleaned_data['tagged_vlans'] = []
+
 
 class InterfaceBulkRenameForm(BulkRenameForm):
     pk = forms.ModelMultipleChoiceField(