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diff --git a/opendaylight/md-sal/cds-access-api/src/main/java/org/opendaylight/controller/cluster/access/commands/ConnectClientRequest.java b/opendaylight/md-sal/cds-access-api/src/main/java/org/opendaylight/controller/cluster/access/commands/ConnectClientRequest.java
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+++ b/opendaylight/md-sal/cds-access-api/src/main/java/org/opendaylight/controller/cluster/access/commands/ConnectClientRequest.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.access.commands;
+
+import akka.actor.ActorRef;
+import com.google.common.annotations.Beta;
+import com.google.common.base.MoreObjects.ToStringHelper;
+import com.google.common.base.Preconditions;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.cluster.access.ABIVersion;
+import org.opendaylight.controller.cluster.access.concepts.AbstractRequestProxy;
+import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
+import org.opendaylight.controller.cluster.access.concepts.Request;
+import org.opendaylight.controller.cluster.access.concepts.RequestException;
+
+/**
+ * Request to connect a frontend instance to the backend. It carries basic information about the frontend:
+ * - its coordinates in {@link #getReplyTo()}.
+ * - its minimum supported ABI version
+ * - its maximum supported ABI version
+ *
+ * It also includes request stream sequencing information.
+ *
+ * @author Robert Varga
+ */
+@Beta
+public final class ConnectClientRequest extends Request<ClientIdentifier, ConnectClientRequest> {
+    private static final long serialVersionUID = 1L;
+
+    private final ABIVersion minVersion;
+    private final ABIVersion maxVersion;
+    private final long resumeSequence;
+
+    public ConnectClientRequest(final ClientIdentifier identifier, final ActorRef replyTo, final ABIVersion minVersion,
+            final ABIVersion maxVersion) {
+        this(identifier, replyTo, minVersion, maxVersion, 0);
+    }
+
+    public ConnectClientRequest(final ClientIdentifier identifier, final ActorRef replyTo, final ABIVersion minVersion,
+            final ABIVersion maxVersion, final long resumeSequence) {
+        super(identifier, replyTo);
+        this.minVersion = Preconditions.checkNotNull(minVersion);
+        this.maxVersion = Preconditions.checkNotNull(maxVersion);
+        this.resumeSequence = resumeSequence;
+    }
+
+    private ConnectClientRequest(final ConnectClientRequest request, final ABIVersion version) {
+        super(request, version);
+        this.minVersion = request.minVersion;
+        this.maxVersion = request.maxVersion;
+        this.resumeSequence = request.resumeSequence;
+    }
+
+    public ABIVersion getMinVersion() {
+        return minVersion;
+    }
+
+    public ABIVersion getMaxVersion() {
+        return maxVersion;
+    }
+
+    public long getResumeSequence() {
+        return resumeSequence;
+    }
+
+    @Override
+    public final ConnectClientFailure toRequestFailure(final RequestException cause) {
+        return new ConnectClientFailure(getTarget(), cause);
+    }
+
+    @Override
+    protected AbstractRequestProxy<ClientIdentifier, ConnectClientRequest> externalizableProxy(final ABIVersion version) {
+        return new ConnectClientRequestProxyV1(this);
+    }
+
+    @Override
+    protected ConnectClientRequest cloneAsVersion(final ABIVersion version) {
+        return new ConnectClientRequest(this, version);
+    }
+
+    @Override
+    protected @Nonnull ToStringHelper addToStringAttributes(final @Nonnull ToStringHelper toStringHelper) {
+        return super.addToStringAttributes(toStringHelper).add("minVersion", minVersion).add("maxVersion", maxVersion)
+                .add("resumeSequence", resumeSequence);
+    }
+}