diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/instructions/L2ModificationInstruction.java b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/L2ModificationInstruction.java
new file mode 100644
index 0000000..f71ad2e
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/L2ModificationInstruction.java
@@ -0,0 +1,124 @@
+package org.onlab.onos.net.flow.instructions;
+
+import org.onlab.packet.MACAddress;
+
+/**
+ * Abstraction of a single traffic treatment step.
+ * @param <T> the type parameter for the instruction
+ */
+public abstract class L2ModificationInstruction implements Instruction {
+
+    /**
+     * Represents the type of traffic treatment.
+     */
+    public enum SubType {
+        /**
+         * Ether src modification.
+         */
+        L2_SRC,
+
+        /**
+         * Ether dst modification.
+         */
+        L2_DST,
+
+        /**
+         * Ethertype modification.
+         */
+        L2_TYPE,
+
+        /**
+         * VLAN id modification.
+         */
+        VLAN_ID,
+
+        /**
+         * VLAN priority modification.
+         */
+        VLAN_PCP
+    }
+
+    // TODO: Create factory class 'Instructions' that will have various factory
+    // to create specific instructions.
+
+    /**
+     * Returns the subtype of the modification instruction.
+     * @return type of instruction
+     */
+    public abstract SubType subtype();
+
+    @Override
+    public Type type() {
+        return Type.MODIFICATION;
+    }
+
+    /**
+     * Represents a L2 src/dst modification instruction.
+     */
+    public static final class ModEtherInstruction extends L2ModificationInstruction {
+
+        private final SubType subtype;
+        private final MACAddress mac;
+
+        public ModEtherInstruction(SubType subType, MACAddress addr) {
+            this.subtype = subType;
+            this.mac = addr;
+        }
+
+        @Override
+        public SubType subtype() {
+            return this.subtype;
+        }
+
+        public MACAddress mac() {
+            return this.mac;
+        }
+
+    }
+
+    /**
+     * Represents a L2 type modification instruction.
+     */
+    public static final class ModEtherTypeInstruction extends L2ModificationInstruction {
+
+        public final short l2Type;
+
+        public ModEtherTypeInstruction(short l2Type) {
+            this.l2Type = l2Type;
+        }
+
+        @Override
+        public SubType subtype() {
+            return SubType.L2_TYPE;
+        }
+
+        public short l2Type() {
+            return this.l2Type;
+        }
+
+    }
+
+    /**
+     * Represents a VLAN id modification instruction.
+     */
+    public static final class ModVlanIdInstruction extends L2ModificationInstruction {
+
+        public final Short vlanId;
+
+        public ModVlanIdInstruction(Short vlanId) {
+            this.vlanId = vlanId;
+        }
+
+        @Override
+        public SubType subtype() {
+            return SubType.VLAN_ID;
+        }
+
+        public Short vlanId() {
+            return this.vlanId;
+        }
+
+    }
+
+
+}