diff --git a/model/cs/content-store-impl.h b/model/cs/content-store-impl.h
new file mode 100644
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+++ b/model/cs/content-store-impl.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>
+ */
+
+#ifndef NDN_CONTENT_STORE_IMPL_H_
+#define NDN_CONTENT_STORE_IMPL_H_
+
+#include "ndn-content-store.h"
+#include "ns3/packet.h"
+#include "ns3/ndn-interest-header.h"
+#include "ns3/ndn-content-object-header.h"
+#include <boost/foreach.hpp>
+
+#include "../../utils/trie-with-policy.h"
+
+namespace ns3 {
+namespace ndn {
+namespace cs {
+
+
+template<class Policy>
+class ContentStoreImpl : public ContentStore,
+                         protected ndnSIM::trie_with_policy< NameComponents,
+                                                             ndnSIM::smart_pointer_payload_traits< Entry >,
+                                                             Policy >
+{
+private:
+  typedef ndnSIM::trie_with_policy< NameComponents,
+                                    ndnSIM::smart_pointer_payload_traits< Entry >,
+                                    Policy > super;
+  
+public:
+  static TypeId
+  GetTypeId ();
+  
+  ContentStoreImpl () { };
+  virtual ~ContentStoreImpl () { };
+  
+  // from ContentStore
+  
+  virtual inline boost::tuple<Ptr<Packet>, Ptr<const ContentObjectHeader>, Ptr<const Packet> >
+  Lookup (Ptr<const InterestHeader> interest);
+            
+  virtual inline bool
+  Add (Ptr<const ContentObjectHeader> header, Ptr<const Packet> packet);
+
+  // virtual bool
+  // Remove (Ptr<InterestHeader> header);
+  
+  virtual inline void
+  Print (std::ostream &os) const;  
+
+private:
+  void
+  SetMaxSize (uint32_t maxSize);
+
+  uint32_t
+  GetMaxSize () const;
+};
+
+} // namespace cs
+} // namespace ndn
+} // namespace ns3
+
+#endif // NDN_CONTENT_STORE_IMPL_H_