diff --git a/java_gen/pre-written/src/test/java/org/projectfloodlight/protocol/OFPortDescTest.java b/java_gen/pre-written/src/test/java/org/projectfloodlight/protocol/OFPortDescTest.java
new file mode 100644
index 0000000..965e314
--- /dev/null
+++ b/java_gen/pre-written/src/test/java/org/projectfloodlight/protocol/OFPortDescTest.java
@@ -0,0 +1,53 @@
+package org.projectfloodlight.protocol;
+
+import java.util.Arrays;
+import java.util.HashSet;
+
+import org.junit.Test;
+import org.projectfloodlight.openflow.protocol.OFFactories;
+import org.projectfloodlight.openflow.protocol.OFFactory;
+import org.projectfloodlight.openflow.protocol.OFPortConfig;
+import org.projectfloodlight.openflow.protocol.OFPortDesc;
+import org.projectfloodlight.openflow.protocol.OFPortState;
+import org.projectfloodlight.openflow.protocol.OFVersion;
+
+import static org.hamcrest.Matchers.is;
+
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests auxiliary OFPortDesc methods for all versions of OpenFlow
+ *
+ * @author Jason Parraga <jason.parraga@bigswitch.com>
+ */
+public class OFPortDescTest {
+
+    @Test
+    public void testIsEnabled() {
+       testIsEnabledForFactory(OFFactories.getFactory(OFVersion.OF_10));
+       testIsEnabledForFactory(OFFactories.getFactory(OFVersion.OF_11));
+       testIsEnabledForFactory(OFFactories.getFactory(OFVersion.OF_12));
+       testIsEnabledForFactory(OFFactories.getFactory(OFVersion.OF_13));
+       testIsEnabledForFactory(OFFactories.getFactory(OFVersion.OF_14));
+    }
+
+    public void testIsEnabledForFactory(OFFactory factory) {
+        // Default
+        OFPortDesc desc = factory.buildPortDesc()
+                .build();
+        assertThat(desc.isEnabled(), is(true));
+
+        // Partially disabled
+        desc = factory.buildPortDesc()
+                .setConfig(new HashSet<OFPortConfig>(Arrays.asList(OFPortConfig.PORT_DOWN)))
+                .build();
+        assertThat(desc.isEnabled(), is(false));
+
+        // Fully disabled
+        desc = factory.buildPortDesc()
+                .setConfig(new HashSet<OFPortConfig>(Arrays.asList(OFPortConfig.PORT_DOWN)))
+                .setState(new HashSet<OFPortState>(Arrays.asList(OFPortState.LINK_DOWN)))
+                .build();
+        assertThat(desc.isEnabled(), is(false));
+    }
+}
diff --git a/java_gen/templates/custom/OFPortDesc.java b/java_gen/templates/custom/OFPortDesc.java
new file mode 100644
index 0000000..3be1b70
--- /dev/null
+++ b/java_gen/templates/custom/OFPortDesc.java
@@ -0,0 +1,11 @@
+
+    /**
+     * Returns true if the port is up, i.e., it's neither administratively
+     * down nor link down. It currently does NOT take STP state into
+     * consideration
+     * @return whether the port is up
+     */
+    public boolean isEnabled() {
+        return (!state.contains(OFPortState.LINK_DOWN) && !config.contains(OFPortConfig.PORT_DOWN));
+    }
+    
\ No newline at end of file
diff --git a/java_gen/templates/custom/OFPortDescVer10.java b/java_gen/templates/custom/OFPortDescVer10.java
new file mode 100644
index 0000000..782a726
--- /dev/null
+++ b/java_gen/templates/custom/OFPortDescVer10.java
@@ -0,0 +1 @@
+//:: include("custom/OFPortDesc.java", msg=msg, has_parent=False)
\ No newline at end of file
diff --git a/java_gen/templates/custom/OFPortDescVer11.java b/java_gen/templates/custom/OFPortDescVer11.java
new file mode 100644
index 0000000..782a726
--- /dev/null
+++ b/java_gen/templates/custom/OFPortDescVer11.java
@@ -0,0 +1 @@
+//:: include("custom/OFPortDesc.java", msg=msg, has_parent=False)
\ No newline at end of file
diff --git a/java_gen/templates/custom/OFPortDescVer12.java b/java_gen/templates/custom/OFPortDescVer12.java
new file mode 100644
index 0000000..782a726
--- /dev/null
+++ b/java_gen/templates/custom/OFPortDescVer12.java
@@ -0,0 +1 @@
+//:: include("custom/OFPortDesc.java", msg=msg, has_parent=False)
\ No newline at end of file
diff --git a/java_gen/templates/custom/OFPortDescVer13.java b/java_gen/templates/custom/OFPortDescVer13.java
new file mode 100644
index 0000000..782a726
--- /dev/null
+++ b/java_gen/templates/custom/OFPortDescVer13.java
@@ -0,0 +1 @@
+//:: include("custom/OFPortDesc.java", msg=msg, has_parent=False)
\ No newline at end of file
diff --git a/java_gen/templates/custom/OFPortDescVer14.java b/java_gen/templates/custom/OFPortDescVer14.java
new file mode 100644
index 0000000..782a726
--- /dev/null
+++ b/java_gen/templates/custom/OFPortDescVer14.java
@@ -0,0 +1 @@
+//:: include("custom/OFPortDesc.java", msg=msg, has_parent=False)
\ No newline at end of file
diff --git a/java_gen/templates/custom/interface/OFPortDesc.java b/java_gen/templates/custom/interface/OFPortDesc.java
new file mode 100644
index 0000000..ecf39f3
--- /dev/null
+++ b/java_gen/templates/custom/interface/OFPortDesc.java
@@ -0,0 +1,2 @@
+    // Additional method
+    boolean isEnabled();
\ No newline at end of file
diff --git a/java_gen/templates/of_interface.java b/java_gen/templates/of_interface.java
index a515ad1..18e2cf1 100644
--- a/java_gen/templates/of_interface.java
+++ b/java_gen/templates/of_interface.java
@@ -27,6 +27,7 @@
 //::
 //:: import itertools
 //:: import re
+//:: import os
 //:: include('_copyright.java')
 
 //:: include('_autogen.java')
@@ -39,6 +40,10 @@
 //:: for prop in msg.members:
     ${prop.java_type.public_type} ${prop.getter_name}()${ "" if prop.is_universal else " throws UnsupportedOperationException"};
 //:: #endfor
+//:: if os.path.exists("%s/custom/interface/%s.java" % (template_dir, msg.name)):
+//:: include("custom/interface/%s.java" % msg.name, msg=msg)
+//:: #endif
+    
 
     void writeTo(ChannelBuffer channelBuffer);
 
diff --git a/openflow_input/bsn_tlv b/openflow_input/bsn_tlv
index e25e2de..59fa53a 100644
--- a/openflow_input/bsn_tlv
+++ b/openflow_input/bsn_tlv
@@ -402,3 +402,9 @@
     uint16_t table_id;
     list(of_bsn_tlv_t) key;
 };
+
+struct of_bsn_tlv_ipv4_netmask : of_bsn_tlv {
+    uint16_t type == 60;
+    uint16_t length;
+    of_ipv4_t value;
+};