diff --git a/protocols/pcep/server/api/src/main/java/org/onosproject/pcep/server/PcepClient.java b/protocols/pcep/server/api/src/main/java/org/onosproject/pcep/server/PcepClient.java
new file mode 100644
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--- /dev/null
+++ b/protocols/pcep/server/api/src/main/java/org/onosproject/pcep/server/PcepClient.java
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2015-present Open Networking Foundation
+ *
+ * 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.
+ */
+package org.onosproject.pcep.server;
+
+import java.util.List;
+
+import org.onosproject.pcepio.protocol.PcepFactory;
+import org.onosproject.pcepio.protocol.PcepMessage;
+import org.onosproject.pcepio.protocol.PcepStateReport;
+
+/**
+ * Represents to provider facing side of a path computation client(pcc).
+ */
+public interface PcepClient {
+
+    /**
+     * Writes the message to the driver.
+     *
+     * @param msg the message to write
+     */
+    void sendMessage(PcepMessage msg);
+
+    /**
+     * Writes the PcepMessage list to the driver.
+     *
+     * @param msgs the messages to be written
+     */
+    void sendMessage(List<PcepMessage> msgs);
+
+    /**
+     * Handle a message from the pcc.
+     *
+     * @param fromClient the message to handle
+     */
+    void handleMessage(PcepMessage fromClient);
+
+    /**
+     * Provides the factory for this PCEP version.
+     *
+     * @return PCEP version specific factory.
+     */
+    PcepFactory factory();
+
+    /**
+     * Gets a string version of the ID for this pcc.
+     *
+     * @return string version of the ID
+     */
+    String getStringId();
+
+    /**
+     * Gets the ipAddress of the client.
+     *
+     * @return the client pccId in IPAddress format
+     */
+    PccId getPccId();
+
+    /**
+     * Checks if the pcc is still connected.
+     *
+     * @return true if client is connected, false otherwise
+     */
+    boolean isConnected();
+
+    /**
+     * Disconnects the pcc by closing the TCP connection. Results in a call
+     * to the channel handler's channelDisconnected method for cleanup.
+     */
+    void disconnectClient();
+
+    /**
+     * Indicates if this pcc is optical.
+     *
+     * @return true if optical
+     */
+    boolean isOptical();
+
+    /**
+     * Identifies the channel used to communicate with the pcc.
+     *
+     * @return string representation of the connection to the client
+     */
+    String channelId();
+
+    /**
+     * Sets the status of LSP state synchronization.
+     *
+     * @param syncStatus LSP synchronization status to be set
+     */
+    void setLspDbSyncStatus(PcepSyncStatus syncStatus);
+
+    /**
+     * Indicates the LSP state synchronization status of this pcc.
+     *
+     * @return LSP state synchronization status.
+     */
+    PcepSyncStatus lspDbSyncStatus();
+
+    /**
+     * Sets the status of label DB synchronization.
+     *
+     * @param syncStatus label DB synchronization status to be set
+     */
+    void setLabelDbSyncStatus(PcepSyncStatus syncStatus);
+
+    /**
+     * Indicates the label DB synchronization status of this pcc.
+     *
+     * @return label DB synchronization status.
+     */
+    PcepSyncStatus labelDbSyncStatus();
+
+    /**
+     * Sets capability negotiated during open message exchange.
+     *
+     * @param capability supported by client
+     */
+    void setCapability(ClientCapability capability);
+
+    /**
+     * Obtains capability supported by client.
+     *
+     * @return capability supported by client
+     */
+    ClientCapability capability();
+
+    /**
+     * Adds PCEP device when session is successfully established.
+     *
+     * @param pc PCEP client details
+     */
+    void addNode(PcepClient pc);
+
+    /**
+     * Removes PCEP device when session is disconnected.
+     *
+     * @param pccId PCEP client ID
+     */
+    void deleteNode(PccId pccId);
+
+     /**
+     * Sets D flag for the given LSP and its LSP info.
+     *
+     * @param lspKey contains LSP info
+     * @param dFlag delegation flag in LSP object
+     */
+    void setLspAndDelegationInfo(LspKey lspKey, boolean dFlag);
+
+    /**
+     * Returns delegation flag for the given LSP info.
+     *
+     * @param lspKey contains LSP info
+     * @return delegation flag
+     */
+    Boolean delegationInfo(LspKey lspKey);
+
+    /**
+     * Creates a temporary cache to hold report messages received during LSPDB sync.
+     *
+     * @param pccId PCC id which is the key to store report messages
+     */
+    void initializeSyncMsgList(PccId pccId);
+
+    /**
+     * Returns the list of report messages received during LSPDB sync.
+     *
+     * @param pccId PCC id which is the key for all the report messages
+     * @return list of report messages received during LSPDB sync
+     */
+    List<PcepStateReport> getSyncMsgList(PccId pccId);
+
+    /**
+     * Removes the list of report messages received during LSPDB sync.
+     *
+     * @param pccId PCC id which is the key for all the report messages
+     */
+    void removeSyncMsgList(PccId pccId);
+
+    /**
+     * Adds report message received during LSPDB sync into temporary cache.
+     *
+     * @param pccId PCC id which is the key to store report messages
+     * @param rptMsg the report message to be stored
+     */
+    void addSyncMsgToList(PccId pccId, PcepStateReport rptMsg);
+}