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diff --git a/extras/deprecated/vom/vom/gbp_ext_itf.hpp b/extras/deprecated/vom/vom/gbp_ext_itf.hpp
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+++ b/extras/deprecated/vom/vom/gbp_ext_itf.hpp
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+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __VOM_GBP_EXT_ITF_H__
+#define __VOM_GBP_EXT_ITF_H__
+
+#include "vom/gbp_bridge_domain.hpp"
+#include "vom/gbp_route_domain.hpp"
+#include "vom/interface.hpp"
+#include "vom/singular_db.hpp"
+
+namespace VOM {
+/**
+ * A enternal interface for GBP
+ */
+class gbp_ext_itf : public object_base
+{
+public:
+  /**
+   * The key for a GBP ext_itf interface
+   */
+  typedef interface::key_t key_t;
+
+  /**
+   * Construct a GBP ext_itf
+   */
+  gbp_ext_itf(const interface& itf,
+              const gbp_bridge_domain& gbd,
+              const gbp_route_domain& grd);
+
+  /**
+   * Copy Construct
+   */
+  gbp_ext_itf(const gbp_ext_itf& r);
+
+  /**
+   * Destructor
+   */
+  ~gbp_ext_itf();
+
+  /**
+   * Return the object's key
+   */
+  const key_t key() const;
+
+  /**
+   * comparison operator
+   */
+  bool operator==(const gbp_ext_itf& bdae) const;
+
+  /**
+   * Return the matching 'singular instance'
+   */
+  std::shared_ptr<gbp_ext_itf> singular() const;
+
+  /**
+   * Find the instnace of the ext_itf interface in the OM
+   */
+  static std::shared_ptr<gbp_ext_itf> find(const key_t& k);
+
+  /**
+   * Dump all bridge_domain-doamin into the stream provided
+   */
+  static void dump(std::ostream& os);
+
+  /**
+   * replay the object to create it in hardware
+   */
+  void replay(void);
+
+  /**
+   * Convert to string for debugging
+   */
+  std::string to_string() const;
+
+  /**
+   * return the ext_itfulation interface's handle
+   */
+  const handle_t& handle() const;
+
+private:
+  /**
+   * Class definition for listeners to OM events
+   */
+  class event_handler : public OM::listener, public inspect::command_handler
+  {
+  public:
+    event_handler();
+    virtual ~event_handler() = default;
+
+    /**
+     * Handle a populate event
+     */
+    void handle_populate(const client_db::key_t& key);
+
+    /**
+     * Handle a replay event
+     */
+    void handle_replay();
+
+    /**
+     * Show the object in the Singular DB
+     */
+    void show(std::ostream& os);
+
+    /**
+     * Get the sortable Id of the listener
+     */
+    dependency_t order() const;
+  };
+
+  /**
+   * event_handler to register with OM
+   */
+  static event_handler m_evh;
+
+  /**
+   * Commit the acculmulated changes into VPP. i.e. to a 'HW" write.
+   */
+  void update(const gbp_ext_itf& obj);
+
+  /**
+   * Find or add the instnace of the bridge_domain domain in the OM
+   */
+  static std::shared_ptr<gbp_ext_itf> find_or_add(const gbp_ext_itf& temp);
+
+  /*
+   * It's the VPPHW class that updates the objects in HW
+   */
+  friend class OM;
+
+  /**
+   * It's the singular_db class that calls replay()
+   */
+  friend class singular_db<key_t, gbp_ext_itf>;
+
+  /**
+   * Sweep/reap the object if still stale
+   */
+  void sweep(void);
+
+  /**
+   * HW configuration for the result of creating the ext_itf
+   */
+  HW::item<bool> m_hw;
+
+  /**
+   * The interface the ext_itf is attached to.
+   */
+  std::shared_ptr<interface> m_itf;
+
+  /**
+   * The BD & RD the ext_itf is in
+   */
+  std::shared_ptr<gbp_bridge_domain> m_bd;
+  std::shared_ptr<gbp_route_domain> m_rd;
+
+  /**
+   * A map of all bridge_domains
+   */
+  static singular_db<key_t, gbp_ext_itf> m_db;
+};
+
+}; // namespace VOM
+
+/*
+ * fd.io coding-style-patch-verification: OFF
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif