diff --git a/protocols/pcep/api/src/main/java/org/onosproject/pcep/controller/PcepAnnotationKeys.java b/protocols/pcep/api/src/main/java/org/onosproject/pcep/controller/PcepAnnotationKeys.java
new file mode 100644
index 0000000..097f647
--- /dev/null
+++ b/protocols/pcep/api/src/main/java/org/onosproject/pcep/controller/PcepAnnotationKeys.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.controller;
+
+/**
+ * Collection of keys for annotation for PCEP tunnels.
+ */
+public final class PcepAnnotationKeys {
+
+    /**
+     *  Prohibits instantiation.
+     */
+    private PcepAnnotationKeys() {
+    }
+
+    /**
+     * Annotation key for bandwidth.
+     * The value for this key is interpreted as Mbps.
+     */
+    public static final String BANDWIDTH = "bandwidth";
+
+    /**
+     * Annotation key for the LSP signaling type.
+     */
+    public static final String LSP_SIG_TYPE = "lspSigType";
+
+    /**
+     * Annotation key for the PCC tunnel id.
+     */
+    public static final String PCC_TUNNEL_ID = "PccTunnelId";
+
+    /**
+     * Annotation key for the LSP id assigned per tunnel per session.
+     */
+    public static final String PLSP_ID = "PLspId";
+
+    /**
+     * Annotation key for the LSP id assigned per tunnel.
+     */
+    public static final String LOCAL_LSP_ID = "localLspId";
+
+    /**
+     * Annotation key for the identification of initiated LSP.
+     */
+    public static final String PCE_INIT = "pceInit";
+
+    /**
+     * Annotation key for the cost type.
+     */
+    public static final String COST_TYPE = "costType";
+
+    /**
+     * Annotation key for the Delegation.
+     * Whether LSPs are delegated or not
+     */
+    public static final String DELEGATE = "delegate";
+}
diff --git a/protocols/pcep/api/src/main/java/org/onosproject/pcep/controller/SrpIdGenerators.java b/protocols/pcep/api/src/main/java/org/onosproject/pcep/controller/SrpIdGenerators.java
new file mode 100644
index 0000000..e0cb3b3
--- /dev/null
+++ b/protocols/pcep/api/src/main/java/org/onosproject/pcep/controller/SrpIdGenerators.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2015-present Open Networking Laboratory
+ *
+ * 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.controller;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.slf4j.Logger;
+
+/**
+ * Unique Srp Id generator for pcep messages.
+ */
+public final class SrpIdGenerators {
+
+    private static final Logger log = getLogger(SrpIdGenerators.class);
+    private static final AtomicInteger SRP_ID_GEN = new AtomicInteger();
+    private static final int MAX_SRP_ID = 0x7FFFFFFF;
+    private static int srpId;
+
+    /**
+     * Default constructor.
+     */
+    private SrpIdGenerators() {
+    }
+
+    /**
+     * Get the next srp id.
+     *
+     * @return srp id
+     */
+    public static int create() {
+        do {
+            if (srpId >= MAX_SRP_ID) {
+                if (SRP_ID_GEN.get() >= MAX_SRP_ID) {
+                    SRP_ID_GEN.set(0);
+                }
+            }
+            srpId = SRP_ID_GEN.incrementAndGet();
+        } while (srpId > MAX_SRP_ID);
+        return srpId;
+    }
+}