diff --git a/model/forwarding-strategy/ccnx-forwarding-strategy.h b/model/forwarding-strategy/ccnx-forwarding-strategy.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author:  Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ *          Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+#ifndef CCNX_FORWARDING_STRATEGY_H
+#define CCNX_FORWARDING_STRATEGY_H
+
+#include "ns3/packet.h"
+#include "ns3/callback.h"
+#include "ns3/object.h"
+#include "ns3/traced-callback.h"
+
+namespace ns3 {
+
+class CcnxFace;
+class CcnxInterestHeader;
+class CcnxContentObjectHeader;
+class CcnxPit;
+class CcnxPitEntry;
+class CcnxFibFaceMetric;
+class CcnxFib;
+class CcnxContentStore;
+
+/**
+ * \ingroup ccnx
+ * \brief Abstract base class for CCNx forwarding strategies
+ */
+class CcnxForwardingStrategy : public Object
+{
+public:
+  static TypeId GetTypeId (void);
+
+  /**
+   * @brief Default constructor
+   */
+  CcnxForwardingStrategy ();
+  virtual ~CcnxForwardingStrategy ();
+
+  /**
+   * \brief Actual processing of incoming CCNx interests. Note, interests do not have payload
+   * 
+   * Processing Interest packets
+   * @param face    incoming face
+   * @param header  deserialized Interest header
+   * @param packet  original packet
+   */
+  virtual void
+  OnInterest (const Ptr<CcnxFace> &face,
+              Ptr<CcnxInterestHeader> &header,
+              const Ptr<const Packet> &p);
+
+  /**
+   * \brief Actual processing of incoming CCNx content objects
+   * 
+   * Processing ContentObject packets
+   * @param face    incoming face
+   * @param header  deserialized ContentObject header
+   * @param payload data packet payload
+   * @param packet  original packet
+   */
+  virtual void
+  OnData (const Ptr<CcnxFace> &face,
+          Ptr<CcnxContentObjectHeader> &header,
+          Ptr<Packet> &payload,
+          const Ptr<const Packet> &packet);
+    
+// protected:
+  /**
+   * @brief Base method to propagate the interest according to the forwarding strategy
+   *
+   * @param pitEntry      Reference to PIT entry (reference to corresponding FIB entry inside)
+   * @param incomingFace  Incoming face
+   * @param header        CcnxInterestHeader
+   * @param packet        Original Interest packet
+   * @param sendCallback  Send callback
+   *
+   * @return true if interest was successfully propagated, false if all options have failed
+   */
+  virtual bool
+  PropagateInterest (Ptr<CcnxPitEntry> pitEntry, 
+                     const Ptr<CcnxFace> &incomingFace,
+                     Ptr<CcnxInterestHeader> &header,
+                     const Ptr<const Packet> &packet) = 0;
+
+protected:
+  /**
+   * @brief Propagate interest via a green interface. Fail, if no green interfaces available
+   *
+   * @param pitEntry      Reference to PIT entry (reference to corresponding FIB entry inside)
+   * @param incomingFace  Incoming face
+   * @param header        CcnxInterestHeader
+   * @param packet        Original Interest packet
+   * @param sendCallback  Send callback
+   * @return true if interest was successfully propagated, false if all options have failed
+   *
+   * \see PropagateInterest
+   */
+  bool
+  PropagateInterestViaGreen (Ptr<CcnxPitEntry> pitEntry, 
+                             const Ptr<CcnxFace> &incomingFace,
+                             Ptr<CcnxInterestHeader> &header,
+                             const Ptr<const Packet> &packet);
+
+  virtual void
+  GiveUpInterest (Ptr<CcnxPitEntry> pitEntry,
+                  Ptr<CcnxInterestHeader> header);
+
+  virtual void
+  OnDataDelayed (Ptr<const CcnxContentObjectHeader> header,
+                 Ptr<const Packet> payload,
+                 const Ptr<const Packet> &packet);
+  
+protected:
+  // inherited from Object class                                                                                                                                                        
+  virtual void NotifyNewAggregate (); ///< @brief Even when object is aggregated to another Object
+  virtual void DoDispose (); ///< @brief Do cleanup
+  
+protected:  
+  Ptr<CcnxPit> m_pit; ///< \brief Reference to PIT to which this forwarding strategy is associated
+  Ptr<CcnxFib> m_fib; ///< \brief FIB  
+  Ptr<CcnxContentStore> m_contentStore; ///< \brief Content store (for caching purposes only)
+
+  bool m_nacksEnabled;
+  bool m_cacheUnsolicitedData;
+
+  // transmittedInterestTrace is inside ForwardingStrategy
+  
+  
+  TracedCallback<Ptr<const CcnxInterestHeader>,
+                 Ptr<const CcnxFace> > m_outInterests; ///< @brief Transmitted interests trace
+
+  TracedCallback<Ptr<const CcnxInterestHeader>,
+                 Ptr<const CcnxFace> > m_inInterests; ///< @brief trace of incoming Interests
+
+  TracedCallback<Ptr<const CcnxInterestHeader>,
+                 Ptr<const CcnxFace> > m_dropInterests; ///< @brief trace of dropped Interests
+  
+  ////////////////////////////////////////////////////////////////////
+  ////////////////////////////////////////////////////////////////////
+  ////////////////////////////////////////////////////////////////////
+
+  TracedCallback<Ptr<const CcnxInterestHeader>,
+                 Ptr<const CcnxFace> > m_outNacks; ///< @brief trace of outgoing NACKs
+
+  TracedCallback<Ptr<const CcnxInterestHeader>,
+                 Ptr<const CcnxFace> > m_inNacks; ///< @brief trace of incoming NACKs
+
+  TracedCallback<Ptr<const CcnxInterestHeader>,
+                 Ptr<const CcnxFace> > m_dropNacks; ///< @brief trace of dropped NACKs
+
+  ////////////////////////////////////////////////////////////////////
+  ////////////////////////////////////////////////////////////////////
+  ////////////////////////////////////////////////////////////////////
+
+  TracedCallback<Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>,
+                 bool /*from cache*/,
+                 Ptr<const CcnxFace> > m_outData; ///< @brief trace of outgoing Data
+
+  TracedCallback<Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>,
+                 Ptr<const CcnxFace> > m_inData; ///< @brief trace of incoming Data
+
+  TracedCallback<Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>,
+                  Ptr<const CcnxFace> > m_dropData;  ///< @brief trace of dropped Data
+};
+
+} //namespace ns3
+
+#endif /* CCNX_FORWARDING_STRATEGY_H */