Fixes #13721: Filter VLAN choices by selected site (if any) when creating a prefix

Author: jeremystretch

docs/release-notes/version-3.6.md

@@ -2,6 +2,10 @@
 
 ## v3.6.2 (FUTURE)
 
+### Bug Fixes
+
+* [#13721](https://github.com/netbox-community/netbox/issues/13721) - Filter VLAN choices by selected site (if any) when creating a prefix
+
 ---
 
 ## v3.6.1 (2023-09-06)

netbox/ipam/forms/model_forms.py

@@ -215,6 +215,9 @@ class PrefixForm(TenancyForm, NetBoxModelForm):
         queryset=VLAN.objects.all(),
         required=False,
         selector=True,
+        query_params={
+            'site_id': '$site',
+        },
         label=_('VLAN'),
     )
     role = DynamicModelChoiceField(