diff --git a/src/lsa/lsa.hpp b/src/lsa/lsa.hpp
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+++ b/src/lsa/lsa.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2020,  The University of Memphis,
+ *                           Regents of the University of California,
+ *                           Arizona Board of Regents.
+ *
+ * This file is part of NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NLSR 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
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NLSR_LSA_LSA_HPP
+#define NLSR_LSA_LSA_HPP
+
+#include "name-prefix-list.hpp"
+#include "adjacent.hpp"
+#include "adjacency-list.hpp"
+#include "test-access-control.hpp"
+
+#include <ndn-cxx/util/scheduler.hpp>
+#include <ndn-cxx/util/time.hpp>
+
+namespace nlsr {
+
+/*!
+   \brief Data abstraction for Lsa
+   Lsa := LSA-TYPE TLV-LENGTH
+            Name
+            SequenceNumber
+            ExpirationTimePoint
+ */
+class Lsa
+{
+public:
+  class Error : public ndn::tlv::Error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : ndn::tlv::Error(what)
+    {
+    }
+  };
+
+  enum class Type {
+    ADJACENCY,
+    COORDINATE,
+    NAME,
+    BASE
+  };
+
+protected:
+  Lsa(const ndn::Name& originRouter, uint32_t seqNo,
+      ndn::time::system_clock::TimePoint expirationTimePoint);
+
+  Lsa() = default;
+
+public:
+  virtual
+  ~Lsa() = default;
+
+  virtual Type
+  getType() const
+  {
+    return Type::BASE;
+  }
+
+  void
+  setSeqNo(uint64_t seqNo)
+  {
+    m_seqNo = seqNo;
+    m_baseWire.reset();
+  }
+
+  uint64_t
+  getSeqNo() const
+  {
+    return m_seqNo;
+  }
+
+  const ndn::Name&
+  getOriginRouter() const
+  {
+    return m_originRouter;
+  }
+
+  const ndn::time::system_clock::TimePoint&
+  getExpirationTimePoint() const
+  {
+    return m_expirationTimePoint;
+  }
+
+  void
+  setExpirationTimePoint(const ndn::time::system_clock::TimePoint& lt)
+  {
+    m_expirationTimePoint = lt;
+    m_baseWire.reset();
+  }
+
+  void
+  setExpiringEventId(ndn::scheduler::EventId eid)
+  {
+    m_expiringEventId = std::move(eid);
+  }
+
+  ndn::scheduler::EventId
+  getExpiringEventId() const
+  {
+    return m_expiringEventId;
+  }
+
+  /*! \brief Gets the key for this LSA.
+
+    Format is: \<router name\>/\<LSA type>\
+   */
+  ndn::Name
+  getKey() const;
+
+  /*! Get data common to all LSA types.
+   */
+  std::string
+  toString() const;
+
+  template<ndn::encoding::Tag TAG>
+  size_t
+  wireEncode(ndn::EncodingImpl<TAG>& block) const;
+
+  void
+  wireDecode(const ndn::Block& wire);
+
+PUBLIC_WITH_TESTS_ELSE_PROTECTED:
+  ndn::Name m_originRouter;
+  uint64_t m_seqNo = 0;
+  ndn::time::system_clock::TimePoint m_expirationTimePoint;
+  ndn::scheduler::EventId m_expiringEventId;
+
+  mutable ndn::Block m_baseWire;
+};
+
+NDN_CXX_DECLARE_WIRE_ENCODE_INSTANTIATIONS(Lsa);
+
+std::ostream&
+operator<<(std::ostream& os, const Lsa::Type& type);
+
+std::istream&
+operator>>(std::istream& is, Lsa::Type& type);
+
+} // namespace nlsr
+
+#endif // NLSR_LSA_LSA_HPP