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diff --git a/metis/ccnx/forwarder/metis/io/metis_ListenerSet.h b/metis/ccnx/forwarder/metis/io/metis_ListenerSet.h
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+/*
+ * Copyright (c) 2017 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.
+ */
+
+/**
+ * @file metis_ListenerSet.h
+ * @brief A listener set is unique on (MetisEncapType, localAddress)
+ *
+ * Keeps track of all the running listeners.  The set is unique on the
+ * encapsulation type and the local address.  For example, with TCP encapsulation and
+ * local address 127.0.0.1 or Ethernet encapsulation and MAC address 00:11:22:33:44:55.
+ *
+ * NOTE: This does not allow multiple EtherType on the same interface because the CPIAddress for
+ * a LINK address does not include an EtherType.
+ *
+ */
+
+#ifndef Metis_metis_ListenerSet_h
+#define Metis_metis_ListenerSet_h
+
+#include <ccnx/forwarder/metis/io/metis_Listener.h>
+
+struct metis_listener_set;
+typedef struct metis_listener_set MetisListenerSet;
+
+/**
+ * <#One Line Description#>
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @param [<#in out in,out#>] <#name#> <#description#>
+ *
+ * @retval <#value#> <#explanation#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+MetisListenerSet *metisListenerSet_Create(void);
+
+/**
+ * <#One Line Description#>
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @param [<#in out in,out#>] <#name#> <#description#>
+ *
+ * @retval <#value#> <#explanation#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void metisListenerSet_Destroy(MetisListenerSet **setPtr);
+
+/**
+ * @function metisListenerSet_Add
+ * @abstract Adds the listener to the set
+ * @discussion
+ *     Unique set based on pair (MetisEncapType, localAddress).
+ *     Takes ownership of the ops memory if added.
+ *
+ * @param <#param1#>
+ * @return true if added, false if not
+ */
+bool metisListenerSet_Add(MetisListenerSet *set, MetisListenerOps *ops);
+
+/**
+ * The number of listeners in the set
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @param [in] set An allocated listener set
+ *
+ * @retval <#value#> <#explanation#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+size_t metisListenerSet_Length(const MetisListenerSet *set);
+
+/**
+ * Returns the listener at the given index
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @param [in] set An allocated listener set
+ * @param [in] index The index position (0 <= index < metisListenerSet_Lenght)
+ *
+ * @retval non-null The listener at index
+ * @retval null An error
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+MetisListenerOps *metisListenerSet_Get(const MetisListenerSet *set, size_t index);
+
+/**
+ * Looks up a listener by its key (EncapType, LocalAddress)
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @param [in] set An allocated listener set
+ * @param [in] encapType the listener type
+ * @param [in] localAddress The local bind address (e.g. MAC address or TCP socket)
+ *
+ * @retval non-null The listener matching the query
+ * @retval null Does not exist
+ *
+ * Example:
+ * @code
+ *
+ * @endcode
+ */
+MetisListenerOps *metisListenerSet_Find(const MetisListenerSet *set, MetisEncapType encapType, const CPIAddress *localAddress);
+#endif