From 0ea057c4ed59deb27fe2edc840402f3d3935c39a Mon Sep 17 00:00:00 2001
From: Tim Young <Tim.Young@LightSys.org>
Date: Thu, 13 Oct 2016 15:36:46 -0500
Subject: [PATCH] Cannot have both untagged and tagged on an interface

---
 EduNetworkBuilder/NetworkInterface.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/EduNetworkBuilder/NetworkInterface.cs b/EduNetworkBuilder/NetworkInterface.cs
index 39a4c16..2ebacbf 100644
--- a/EduNetworkBuilder/NetworkInterface.cs
+++ b/EduNetworkBuilder/NetworkInterface.cs
@@ -102,9 +102,14 @@ namespace EduNetworkBuilder
                 else
                 {
                     if (Tag == VLANTagType.Untagged)
-                        one.Tag = VLANTagType.Forbidden;
+                        one.Tag = VLANTagType.Forbidden;  //Only one untagged port allowed at a time
                     if (Tag == VLANTagType.Tagged && !isPort) //Ports can have multiple tags on one interface
                         one.Tag = VLANTagType.Forbidden;
+                    if (Tag == VLANTagType.Tagged && isPort)
+                    {
+                        if(one.Tag != VLANTagType.Tagged)
+                            one.Tag = VLANTagType.Forbidden; //We cannot have an untagged port and tagged ports at the same time
+                    }
                 }
             }
             if (!foundit)