diff --git a/model/fw/ndn-forwarding-strategy.h b/model/fw/ndn-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 NDN_FORWARDING_STRATEGY_H
+#define NDN_FORWARDING_STRATEGY_H
+
+#include "ns3/packet.h"
+#include "ns3/callback.h"
+#include "ns3/object.h"
+#include "ns3/traced-callback.h"
+
+namespace ns3 {
+namespace ndn {
+
+class Face;
+class InterestHeader;
+class ContentObjectHeader;
+class Pit;
+namespace pit { class Entry; }
+class FibFaceMetric;
+class Fib;
+class ContentStore;
+
+/**
+ * \ingroup ndn
+ * \brief Abstract base class for Ndn forwarding strategies
+ */
+class ForwardingStrategy :
+    public Object
+{
+public:
+  static TypeId GetTypeId (void);
+
+  /**
+   * @brief Default constructor
+   */
+  ForwardingStrategy ();
+  virtual ~ForwardingStrategy ();
+
+  /**
+   * \brief Actual processing of incoming Ndn 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<Face> &face,
+              Ptr<InterestHeader> &header,
+              const Ptr<const Packet> &p);
+
+  /**
+   * \brief Actual processing of incoming Ndn 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<Face> &face,
+          Ptr<ContentObjectHeader> &header,
+          Ptr<Packet> &payload,
+          const Ptr<const Packet> &packet);
+
+  virtual void
+  WillErasePendingInterest (Ptr<pit::Entry> pitEntry);
+
+  virtual void
+  RemoveFace (Ptr<Face> face);
+  
+protected:
+  // events
+  virtual void
+  DidReceiveDuplicateInterest (const Ptr<Face> &face,
+                               Ptr<InterestHeader> &header,
+                               const Ptr<const Packet> &packet,
+                               Ptr<pit::Entry> pitEntry);
+
+  virtual void
+  DidExhaustForwardingOptions (const Ptr<Face> &incomingFace,
+                               Ptr<InterestHeader> header,
+                               const Ptr<const Packet> &packet,
+                               Ptr<pit::Entry> pitEntry);
+
+  virtual void
+  FailedToCreatePitEntry (const Ptr<Face> &incomingFace,
+                          Ptr<InterestHeader> header,
+                          const Ptr<const Packet> &packet);
+  
+  virtual void
+  DidCreatePitEntry (const Ptr<Face> &incomingFace,
+                     Ptr<InterestHeader> header,
+                     const Ptr<const Packet> &packet,
+                     Ptr<pit::Entry> pitEntry);
+
+  virtual bool
+  DetectRetransmittedInterest (const Ptr<Face> &incomingFace,
+                               Ptr<pit::Entry> pitEntry);
+
+  // makes sense only for data received from network
+  // When Interest is satisfied from the cache, incoming face is 0
+  virtual void
+  WillSatisfyPendingInterest (const Ptr<Face> &incomingFace,
+                              Ptr<pit::Entry> pitEntry);
+
+  // for data received both from network and cache
+  virtual void
+  SatisfyPendingInterest (const Ptr<Face> &incomingFace, // 0 allowed (from cache)
+                          Ptr<const ContentObjectHeader> header,
+                          Ptr<const Packet> payload,
+                          const Ptr<const Packet> &packet,
+                          Ptr<pit::Entry> pitEntry);
+
+  virtual void
+  DidSendOutData (const Ptr<Face> &face,
+                  Ptr<const ContentObjectHeader> header,
+                  Ptr<const Packet> payload,
+                  const Ptr<const Packet> &packet);
+  
+  virtual void
+  DidReceiveUnsolicitedData (const Ptr<Face> &incomingFace,
+                             Ptr<const ContentObjectHeader> header,
+                             Ptr<const Packet> payload);
+  
+  virtual bool
+  ShouldSuppressIncomingInterest (const Ptr<Face> &incomingFace,
+                                  Ptr<pit::Entry> pitEntry);
+
+  /**
+   * @brief Event fired before actually sending out an interest
+   *
+   * If event returns false, then there is some kind of a problem (e.g., per-face limit reached)
+   */
+  virtual bool
+  WillSendOutInterest (const Ptr<Face> &outgoingFace,
+                       Ptr<InterestHeader> header,
+                       Ptr<pit::Entry> pitEntry);
+
+  /**
+   * @brief Event fired just after sending out an interest
+   */
+  virtual void
+  DidSendOutInterest (const Ptr<Face> &outgoingFace,
+                      Ptr<InterestHeader> header,
+                      const Ptr<const Packet> &packet,
+                      Ptr<pit::Entry> pitEntry);
+
+  virtual void
+  PropagateInterest (const Ptr<Face> &incomingFace,
+                     Ptr<InterestHeader> header,
+                     const Ptr<const Packet> &packet,
+                     Ptr<pit::Entry> pitEntry);
+  
+  /**
+   * @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        InterestHeader
+   * @param packet        Original Interest packet
+   * @param sendCallback  Send callback
+   *
+   * @return true if interest was successfully propagated, false if all options have failed
+   */
+  virtual bool
+  DoPropagateInterest (const Ptr<Face> &incomingFace,
+                       Ptr<InterestHeader> header,
+                       const Ptr<const Packet> &packet,
+                       Ptr<pit::Entry> pitEntry) = 0;
+  
+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<Pit> m_pit; ///< \brief Reference to PIT to which this forwarding strategy is associated
+  Ptr<Fib> m_fib; ///< \brief FIB  
+  Ptr<ContentStore> m_contentStore; ///< \brief Content store (for caching purposes only)
+
+  bool m_cacheUnsolicitedData;
+  bool m_detectRetransmissions;
+  
+  TracedCallback<Ptr<const InterestHeader>,
+                 Ptr<const Face> > m_outInterests; ///< @brief Transmitted interests trace
+
+  TracedCallback<Ptr<const InterestHeader>,
+                 Ptr<const Face> > m_inInterests; ///< @brief trace of incoming Interests
+
+  TracedCallback<Ptr<const InterestHeader>,
+                 Ptr<const Face> > m_dropInterests; ///< @brief trace of dropped Interests
+  
+  ////////////////////////////////////////////////////////////////////
+  ////////////////////////////////////////////////////////////////////
+  ////////////////////////////////////////////////////////////////////
+
+  TracedCallback<Ptr<const ContentObjectHeader>, Ptr<const Packet>,
+                 bool /*from cache*/,
+                 Ptr<const Face> > m_outData; ///< @brief trace of outgoing Data
+
+  TracedCallback<Ptr<const ContentObjectHeader>, Ptr<const Packet>,
+                 Ptr<const Face> > m_inData; ///< @brief trace of incoming Data
+
+  TracedCallback<Ptr<const ContentObjectHeader>, Ptr<const Packet>,
+                  Ptr<const Face> > m_dropData;  ///< @brief trace of dropped Data
+};
+
+} // namespace ndn
+} // namespace ns3
+
+#endif /* NDN_FORWARDING_STRATEGY_H */