From 05570ae4ade98eca869a07767f932af23d06e3a6 Mon Sep 17 00:00:00 2001
From: Saria Hajjar <sariahajjar@gmail.com>
Date: Tue, 31 Dec 2019 20:47:13 +0000
Subject: [PATCH] Clean tagged VLANs

---
 netbox/dcim/forms.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/netbox/dcim/forms.py b/netbox/dcim/forms.py
index 1774fc986..e4bd12c80 100644
--- a/netbox/dcim/forms.py
+++ b/netbox/dcim/forms.py
@@ -74,6 +74,15 @@ class InterfaceCommonForm:
         elif self.cleaned_data['mode'] == IFACE_MODE_TAGGED_ALL:
             self.cleaned_data['tagged_vlans'] = []
 
+        # Validate tagged VLANs; must be a global VLAN or in the same site 
+        else:
+            for tagged_vlan in tagged_vlans:
+                if tagged_vlan.site not in [self.cleaned_data['device'].site, None]:
+                    raise forms.ValidationError({
+                        'tagged_vlans': "The tagged VLAN ({}) must belong to the same site as the interface's parent "
+                                         "device/VM, or it must be global".format(tagged_vlan)
+                    })
+
 
 class BulkRenameForm(forms.Form):
     """