diff --git a/api/src/main/java/org/opencord/bng/BngAttachment.java b/api/src/main/java/org/opencord/bng/BngAttachment.java
new file mode 100644
index 0000000..3fce980
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/BngAttachment.java
@@ -0,0 +1,266 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.behaviour.BngProgrammable;
+
+/**
+ * Abstract implementation of an attachment.
+ */
+public abstract class BngAttachment implements BngProgrammable.Attachment {
+    private final ApplicationId appId;
+    private final VlanId sTag;
+    private final VlanId cTag;
+    private final MacAddress macAddress;
+    private final IpAddress ipAddress;
+    private final boolean lineActivated;
+    private final ConnectPoint oltConnectPoint;
+    private final String onuSerial;
+    private final short qinqTpid;
+
+    /**
+     * Creates a new attachment.
+     *
+     * @param appId           The application that created this attachment
+     * @param sTag            The VLAN S-TAG
+     * @param cTag            The VLAN C-TAG
+     * @param macAddress      The MAC address of the attachment
+     * @param ipAddress       The IP address of the attachment
+     * @param lineActivated   Define if the attachment is active or not
+     * @param oltConnectPoint The connect point of the OLT (UNI port)
+     * @param onuSerial       The serial string of the ONU
+     * @param qinqTpid        The QinQ Tpid for the packets
+     */
+    BngAttachment(ApplicationId appId, VlanId sTag, VlanId cTag,
+                  MacAddress macAddress, IpAddress ipAddress,
+                  boolean lineActivated, ConnectPoint oltConnectPoint,
+                  String onuSerial, short qinqTpid) {
+        this.appId = appId;
+        this.sTag = sTag;
+        this.cTag = cTag;
+        this.macAddress = macAddress;
+        this.ipAddress = ipAddress;
+        this.lineActivated = lineActivated;
+        this.oltConnectPoint = oltConnectPoint;
+        this.onuSerial = onuSerial;
+        this.qinqTpid = qinqTpid;
+    }
+
+    /**
+     * Returns the OLT connect point (UNI port).
+     *
+     * @return The OLT connect point
+     */
+    public ConnectPoint oltConnectPoint() {
+        return this.oltConnectPoint;
+    }
+
+    /**
+     * Returns the ONU serial number.
+     *
+     * @return The ONU serial number
+     */
+    public String onuSerial() {
+        return this.onuSerial;
+    }
+
+    /**
+     * Returns the QinQ TPID.
+     *
+     * @return The QinQ TPID
+     */
+    public short qinqTpid() {
+        return this.qinqTpid;
+    }
+
+    @Override
+    public ApplicationId appId() {
+        return appId;
+    }
+
+    @Override
+    public VlanId sTag() {
+        return sTag;
+    }
+
+    @Override
+    public VlanId cTag() {
+        return cTag;
+    }
+
+    @Override
+    public MacAddress macAddress() {
+        return macAddress;
+    }
+
+    @Override
+    public IpAddress ipAddress() {
+        return ipAddress;
+    }
+
+    @Override
+    public boolean lineActive() {
+        return lineActivated;
+    }
+
+    MoreObjects.ToStringHelper toStringHelper() {
+        return MoreObjects.toStringHelper(this)
+                .add("appId", appId)
+                .add("sTag", sTag)
+                .add("cTag", cTag)
+                .add("macAddress", macAddress)
+                .add("ipAddress", ipAddress)
+                .add("lineActivated", lineActivated)
+                .add("oltConnectPoint", oltConnectPoint)
+                .add("onuSerial", onuSerial)
+                .add("qinqTpid", qinqTpid);
+    }
+
+    /**
+     * Abstract builder of attachments.
+     * <p>
+     * TODO: javadoc
+     */
+    public abstract static class BngBuilder {
+        ApplicationId appId;
+        VlanId sTag;
+        VlanId cTag;
+        MacAddress macAddress;
+        IpAddress ipAddress = IpAddress.valueOf(0);
+        boolean lineActivated;
+        ConnectPoint oltconnectPoint;
+        String onuSerial;
+        short qinqTpid;
+
+        BngBuilder() {
+            // Hide constructor
+            this.lineActivated = false;
+        }
+
+        /**
+         * Sets the ONU serial number.
+         *
+         * @param onuSerial The ONU serial number
+         * @return self
+         */
+        public BngBuilder withOnuSerial(String onuSerial) {
+            this.onuSerial = onuSerial;
+            return this;
+        }
+
+        /**
+         * Sets the OLT connect point (UNI port).
+         *
+         * @param oltconnectPoint The OLT connect point
+         * @return self
+         */
+        public BngBuilder withOltConnectPoint(ConnectPoint oltconnectPoint) {
+            this.oltconnectPoint = oltconnectPoint;
+            return this;
+        }
+
+        /**
+         * Sets the VLAN S-Tag.
+         *
+         * @param sTag The VLAN S-Tag
+         * @return self
+         */
+        public BngBuilder withSTag(VlanId sTag) {
+            this.sTag = sTag;
+            return this;
+        }
+
+        /**
+         * Sets the VLAN C-Tag.
+         *
+         * @param cTag the VLAN C-Tag
+         * @return self
+         */
+        public BngBuilder withCTag(VlanId cTag) {
+            this.cTag = cTag;
+            return this;
+        }
+
+        /**
+         * Sets the attachment activation state.
+         *
+         * @param lineActivated The attachment activation state
+         * @return self
+         */
+        public BngBuilder lineActivated(boolean lineActivated) {
+            this.lineActivated = lineActivated;
+            return this;
+        }
+
+        /**
+         * Sets the application ID.
+         *
+         * @param appId The application ID.
+         * @return self
+         */
+        public BngBuilder withApplicationId(ApplicationId appId) {
+            this.appId = appId;
+            return this;
+        }
+
+        /**
+         * Sets the attachment MAC address.
+         *
+         * @param macAddress The MAC address
+         * @return self
+         */
+        public BngBuilder withMacAddress(MacAddress macAddress) {
+            this.macAddress = macAddress;
+            return this;
+        }
+
+        /**
+         * Sets the attachment IP address.
+         *
+         * @param ipAddress The IP address
+         * @return self
+         */
+        public BngBuilder withIpAddress(IpAddress ipAddress) {
+            this.ipAddress = ipAddress;
+            return this;
+        }
+
+        /**
+         * Sets the QinQ tpid.
+         *
+         * @param qinqTpid The QinQ tpid
+         * @return self
+         */
+        public BngBuilder withQinqTpid(short qinqTpid) {
+            this.qinqTpid = qinqTpid;
+            return this;
+        }
+
+        /**
+         * Returns a new BNG attachment.
+         *
+         * @return BNG attachment
+         */
+        public abstract BngAttachment build();
+    }
+}
diff --git a/api/src/main/java/org/opencord/bng/BngService.java b/api/src/main/java/org/opencord/bng/BngService.java
new file mode 100644
index 0000000..c9936ae
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/BngService.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.net.DeviceId;
+
+import java.util.Map;
+
+/**
+ * Service for managing attachments.
+ */
+public interface BngService {
+
+    String ONU_ANNOTATION = "onu";
+
+    /**
+     * Sets up the given attachment with the given attachemtn key in the BNG
+     * app. If the attachment is already registered it will be updated. It will
+     * also trigger the termination of the attachment user traffic on the ASG
+     * device.
+     *
+     * @param attachmentKey The key for the given attachment
+     * @param attachment    The attachment to be installed or updated
+     */
+    void setupAttachment(String attachmentKey, BngAttachment attachment);
+
+    /**
+     * Removes an attachment given its attachment ID. It will also trigger the
+     * removal of all the related attachment flows from the ASG device.
+     *
+     * @param attachmentKey The ID of the attachment to be removed
+     */
+    void removeAttachment(String attachmentKey);
+
+    /**
+     * Returns a map with the registered attachments.
+     *
+     * @return The map of attachemtn keys and attachments. Empty map if no
+     * attachment is registered.
+     */
+    Map<String, BngAttachment> getAttachments();
+
+    /**
+     * Returns the registered attachment given the ID.
+     *
+     * @param attachmentKey The attachment ID
+     * @return The attachment if it is present, null otherwise
+     */
+    BngAttachment getAttachment(String attachmentKey);
+
+    /**
+     * Returns the BNG device ID currently used.
+     *
+     * @return The BNG device ID.
+     */
+    DeviceId getBngDeviceId();
+}
\ No newline at end of file
diff --git a/api/src/main/java/org/opencord/bng/BngStatsEvent.java b/api/src/main/java/org/opencord/bng/BngStatsEvent.java
new file mode 100644
index 0000000..2622b41
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/BngStatsEvent.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * Represents an event related to attachment-level statistics.
+ */
+public final class BngStatsEvent extends
+        AbstractEvent<BngStatsEvent.EventType, BngStatsEventSubject> {
+
+    /**
+     * Creates an attachment-level statistics event.
+     *
+     * @param type    Event type
+     * @param subject Event subject
+     */
+    public BngStatsEvent(EventType type, BngStatsEventSubject subject) {
+        super(type, subject);
+    }
+
+    /**
+     * Type of the event.
+     */
+    public enum EventType {
+        /**
+         * Signals that the statistics has been updated.
+         */
+        STATS_UPDATED
+    }
+}
diff --git a/api/src/main/java/org/opencord/bng/BngStatsEventListener.java b/api/src/main/java/org/opencord/bng/BngStatsEventListener.java
new file mode 100644
index 0000000..6232428
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/BngStatsEventListener.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Listener for attachment-level statistics events.
+ */
+public interface BngStatsEventListener extends EventListener<BngStatsEvent> {
+}
\ No newline at end of file
diff --git a/api/src/main/java/org/opencord/bng/BngStatsEventSubject.java b/api/src/main/java/org/opencord/bng/BngStatsEventSubject.java
new file mode 100644
index 0000000..05ae43a
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/BngStatsEventSubject.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableMap;
+import org.onosproject.net.behaviour.BngProgrammable.BngCounterType;
+import org.onosproject.net.pi.runtime.PiCounterCellData;
+
+import java.util.Map;
+
+/**
+ * Subject for attachment-level statistics events.
+ */
+public final class BngStatsEventSubject {
+
+    private final BngAttachment bngAttachment;
+    private final String attachmentKey;
+    private final ImmutableMap<BngCounterType, PiCounterCellData> attachmentStats;
+
+    /**
+     * Creates a subject for attachment-level statistics event.
+     *
+     * @param attachmentKey   The attachment key
+     * @param bngAttachment   The attachment instance
+     * @param attachmentStats The attachments statistics
+     */
+    public BngStatsEventSubject(String attachmentKey, BngAttachment bngAttachment,
+                                Map<BngCounterType, PiCounterCellData> attachmentStats) {
+        this.attachmentKey = attachmentKey;
+        this.bngAttachment = bngAttachment;
+        this.attachmentStats = ImmutableMap.copyOf(attachmentStats);
+    }
+
+    /**
+     * Returns an immutable representation of the attachment-level statistics.
+     *
+     * @return The pair attachment instance and attachment-level statistics
+     */
+    public Map<BngCounterType, PiCounterCellData> getAttachmentStats() {
+        return attachmentStats;
+    }
+
+    /**
+     * Returns the BNG attachment instance of the attachment-level statistics.
+     *
+     * @return The BNG attachment instance
+     */
+    public BngAttachment getBngAttachment() {
+        return this.bngAttachment;
+    }
+
+    public String getAttachmentKey() {
+        return this.attachmentKey;
+    }
+
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("attachmentKey", attachmentKey)
+                .add("bngAttachment", bngAttachment)
+                .add("attachmentsStats", attachmentStats)
+                .toString();
+    }
+}
diff --git a/api/src/main/java/org/opencord/bng/BngStatsService.java b/api/src/main/java/org/opencord/bng/BngStatsService.java
new file mode 100644
index 0000000..45ab29b
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/BngStatsService.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.event.ListenerService;
+import org.onosproject.net.behaviour.BngProgrammable;
+import org.onosproject.net.pi.runtime.PiCounterCellData;
+
+import java.util.Map;
+
+/**
+ * Service to retrieve attachment statistics.
+ */
+public interface BngStatsService
+        extends ListenerService<BngStatsEvent, BngStatsEventListener> {
+
+    /**
+     * Returns the statistics given an attachment Key. If the attachment is not
+     * programmed in the ASG, it returns an empty map. If one of the counter
+     * type is not supported by the ASG device, that specific counter will not
+     * be found in the map.
+     *
+     * @param bngAttachmentKey The attachment Key
+     * @return A map with the type of the counter and the associated statistics
+     * coming from the ASG device. Empty map if no BNG programmable is
+     * available.
+     */
+    Map<BngProgrammable.BngCounterType, PiCounterCellData> getStats(String bngAttachmentKey);
+
+    /**
+     * Returns the aggregate statistics related to attachments that are not
+     * known by this app, e.g., packets that are sent from an attachment while
+     * the attachment is negotiating the session.
+     *
+     * @return The statistics of not registered attachment. null if no BNG
+     * programmable device is available.
+     */
+    PiCounterCellData getControlStats();
+
+}
diff --git a/api/src/main/java/org/opencord/bng/PppoeBngAttachment.java b/api/src/main/java/org/opencord/bng/PppoeBngAttachment.java
new file mode 100644
index 0000000..7d6c8ed
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/PppoeBngAttachment.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.behaviour.BngProgrammable;
+
+/**
+ * Contains all the information about an attachment in the PPPoE BNG context.
+ */
+public final class PppoeBngAttachment extends BngAttachment {
+
+    // The PPPoE session ID
+    private final short pppoeSessionId;
+
+    private PppoeBngAttachment(ApplicationId appId, VlanId sTag, VlanId cTag,
+                               MacAddress macAddress, IpAddress ipAddress, boolean lineActivated,
+                               short pppoeSessionId, ConnectPoint oltConnectPoint, String onuSerial,
+                               short qinqTpid) {
+        super(appId, sTag, cTag, macAddress, ipAddress, lineActivated,
+              oltConnectPoint, onuSerial, qinqTpid);
+        this.pppoeSessionId = pppoeSessionId;
+    }
+
+    /**
+     * Returns a builder for PPPoE BNG Attachemnt.
+     *
+     * @return The builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    // TODO: remove when BngProgrammable API are updated!
+    @Override
+    public BngProgrammable.AttachmentId attachmentId() {
+        return null;
+    }
+
+    @Override
+    public BngProgrammable.Attachment.AttachmentType type() {
+        return BngProgrammable.Attachment.AttachmentType.PPPoE;
+    }
+
+    @Override
+    public short pppoeSessionId() {
+        return this.pppoeSessionId;
+    }
+
+    @Override
+    public String toString() {
+        return this.toStringHelper()
+                .add("pppoeSessionId", pppoeSessionId())
+                .toString();
+    }
+
+    /**
+     * Builder of PPPoE attachments.
+     */
+    public static final class Builder extends BngBuilder {
+        private short pppoeSessionId = 0;
+
+        private Builder() {
+            super();
+        }
+
+        /**
+         * Sets the PPPoE session ID.
+         *
+         * @param pppoeSessionId The PPPoE session ID
+         * @return self
+         */
+        public Builder withPppoeSessionId(short pppoeSessionId) {
+            this.pppoeSessionId = pppoeSessionId;
+            return this;
+        }
+
+        /**
+         * Returns a new PPPoE attachment.
+         *
+         * @return PPPoE attachment
+         */
+        public PppoeBngAttachment build() {
+            return new PppoeBngAttachment(this.appId,
+                                          this.sTag,
+                                          this.cTag,
+                                          this.macAddress,
+                                          this.ipAddress,
+                                          this.lineActivated,
+                                          this.pppoeSessionId,
+                                          this.oltconnectPoint,
+                                          this.onuSerial,
+                                          this.qinqTpid);
+        }
+    }
+}
diff --git a/api/src/main/java/org/opencord/bng/PppoeBngControlHandler.java b/api/src/main/java/org/opencord/bng/PppoeBngControlHandler.java
new file mode 100644
index 0000000..4338da4
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/PppoeBngControlHandler.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.event.ListenerService;
+
+/**
+ * BNG control packet service for PPPoE protocol.
+ */
+public interface PppoeBngControlHandler
+        extends ListenerService<PppoeEvent, PppoeEventListener> {
+}
diff --git a/api/src/main/java/org/opencord/bng/PppoeEvent.java b/api/src/main/java/org/opencord/bng/PppoeEvent.java
new file mode 100644
index 0000000..7bccabf
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/PppoeEvent.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * PPPoE attachment level event. This kind of events are used to advertise
+ * control level attachment events (e.g., attachment creation, successful
+ * authentication etc.)
+ */
+public final class PppoeEvent extends
+        AbstractEvent<PppoeEvent.EventType, PppoeEventSubject> {
+    /**
+     * Creates a new event for the given attachment information.
+     *
+     * @param type    type
+     * @param subject the attachment event
+     */
+    public PppoeEvent(EventType type, PppoeEventSubject subject) {
+        super(type, subject);
+    }
+
+    /**
+     * Type of the event.
+     */
+    public enum EventType {
+        /**
+         * Signals that a PPPoE session has been initiated from the client.
+         */
+        SESSION_INIT,
+
+        /**
+         * Signal that a PPPoE session has been established.
+         */
+        SESSION_CONFIRMATION,
+
+        /**
+         * Signal that the PPPoE session has been terminated.
+         */
+        SESSION_TERMINATION,
+
+        /**
+         * Signals an IPCP configuration acknowledge event.
+         */
+        IPCP_CONF_ACK,
+
+        /**
+         * Signals an IPCP configuration request event.
+         */
+        IPCP_CONF_REQUEST,
+
+        /**
+         * Authentication initiated.
+         */
+        AUTH_REQUEST,
+
+        /**
+         * Authentication confirmation.
+         */
+        AUTH_SUCCESS,
+
+        /**
+         * Failed authentication.
+         */
+        AUTH_FAILURE
+    }
+}
\ No newline at end of file
diff --git a/api/src/main/java/org/opencord/bng/PppoeEventListener.java b/api/src/main/java/org/opencord/bng/PppoeEventListener.java
new file mode 100644
index 0000000..40d5ab1
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/PppoeEventListener.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Listener for PPPoE attachment level events.
+ */
+public interface PppoeEventListener extends EventListener<PppoeEvent> {
+}
diff --git a/api/src/main/java/org/opencord/bng/PppoeEventSubject.java b/api/src/main/java/org/opencord/bng/PppoeEventSubject.java
new file mode 100644
index 0000000..734ac37
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/PppoeEventSubject.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2019-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.opencord.bng;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.net.ConnectPoint;
+
+/**
+ * Subject for a PPPoE attachment level events.
+ */
+public final class PppoeEventSubject {
+
+    private final ConnectPoint oltConnectPoint;
+    private final IpAddress ipAddress;
+    private final MacAddress macAddress;
+    private final String onuSerialNumber;
+    private final short sessionId;
+    private final VlanId sTag;
+    private final VlanId cTag;
+
+    /**
+     * Creates a PPPoE attachment event subject.
+     *
+     * @param oltConnectPoint The connect point of the OLT (UNI port)
+     * @param ipAddress       The IP Address that has been assigned
+     * @param macAddress      The MAC address of the attachment
+     * @param onuSerialNumber The serial number of the ONU
+     * @param sessionId       The PPPoE session ID
+     * @param sTag            The VLAN S-Tag
+     * @param cTag            The VLan C-Tag
+     */
+    public PppoeEventSubject(ConnectPoint oltConnectPoint,
+                             IpAddress ipAddress,
+                             MacAddress macAddress,
+                             String onuSerialNumber,
+                             short sessionId,
+                             VlanId sTag,
+                             VlanId cTag) {
+        this.oltConnectPoint = oltConnectPoint;
+        this.ipAddress = ipAddress;
+        this.macAddress = macAddress;
+        this.onuSerialNumber = onuSerialNumber;
+        this.sessionId = sessionId;
+        this.sTag = sTag;
+        this.cTag = cTag;
+    }
+
+    /**
+     * Returns the connect point of the OLT (UNI port).
+     *
+     * @return The connect point
+     */
+    public ConnectPoint getOltConnectPoint() {
+        return this.oltConnectPoint;
+    }
+
+
+    /**
+     * Returns the assigned IP address (if any).
+     *
+     * @return The IP address
+     */
+    public IpAddress getIpAddress() {
+        return this.ipAddress;
+    }
+
+    /**
+     * Returns the MAC address.
+     *
+     * @return The MAC address
+     */
+    public MacAddress getMacAddress() {
+        return this.macAddress;
+    }
+
+    /**
+     * Returns the ONU serial number.
+     *
+     * @return The ONU serial number
+     */
+    public String getOnuSerialNumber() {
+        return onuSerialNumber;
+    }
+
+    /**
+     * Returns the session ID.
+     *
+     * @return The session ID.
+     */
+    public short getSessionId() {
+        return this.sessionId;
+    }
+
+    /**
+     * Returns the VLAN S-Tag.
+     *
+     * @return The VLAN S-Tag.
+     */
+    public VlanId getsTag() {
+        return sTag;
+    }
+
+    /**
+     * Returns the VLAN C-Tag.
+     *
+     * @return The VLAN C-Tag.
+     */
+    public VlanId getcTag() {
+        return cTag;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("oltConnectPoint", oltConnectPoint)
+                .add("ipAddress", ipAddress)
+                .add("macAddress", macAddress)
+                .add("onuSerialNumber", onuSerialNumber)
+                .add("sessionId", sessionId)
+                .add("STag", sTag)
+                .add("CTag", cTag)
+                .toString();
+    }
+}
diff --git a/api/src/main/java/org/opencord/bng/package-info.java b/api/src/main/java/org/opencord/bng/package-info.java
new file mode 100644
index 0000000..170eb9c
--- /dev/null
+++ b/api/src/main/java/org/opencord/bng/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2019-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.
+ */
+
+/**
+ * BNG application.
+ */
+package org.opencord.bng;