diff --git a/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/GnmiDeviceDescriptionDiscovery.java b/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/GnmiDeviceDescriptionDiscovery.java
new file mode 100644
index 0000000..04c9f01
--- /dev/null
+++ b/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/GnmiDeviceDescriptionDiscovery.java
@@ -0,0 +1,305 @@
+/*
+ * Copyright 2017-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.drivers.gnmi;
+
+import com.google.common.collect.ImmutableList;
+import gnmi.gNMIGrpc;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.Status;
+import io.grpc.StatusRuntimeException;
+import io.grpc.internal.DnsNameResolverProvider;
+import io.grpc.netty.NettyChannelBuilder;
+import io.grpc.stub.StreamObserver;
+import org.onosproject.grpc.api.GrpcChannelId;
+import org.onosproject.grpc.api.GrpcController;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.device.DefaultPortDescription;
+import org.onosproject.net.device.DeviceDescription;
+import org.onosproject.net.device.DeviceDescriptionDiscovery;
+import org.onosproject.net.device.PortDescription;
+import org.onosproject.net.driver.AbstractHandlerBehaviour;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import static gnmi.Gnmi.Path;
+import static gnmi.Gnmi.PathElem;
+import static gnmi.Gnmi.SubscribeRequest;
+import static gnmi.Gnmi.SubscribeResponse;
+import static gnmi.Gnmi.Subscription;
+import static gnmi.Gnmi.SubscriptionList;
+import static gnmi.Gnmi.Update;
+
+/**
+ * Class that discovers the device description and ports of a device that
+ * supports the gNMI protocol and Openconfig models.
+ */
+public class GnmiDeviceDescriptionDiscovery
+        extends AbstractHandlerBehaviour
+        implements DeviceDescriptionDiscovery {
+
+    private static final int REQUEST_TIMEOUT_SECONDS = 5;
+
+    private static final Logger log = LoggerFactory
+            .getLogger(GnmiDeviceDescriptionDiscovery.class);
+
+    private static final String GNMI_SERVER_ADDR_KEY = "gnmi_ip";
+    private static final String GNMI_SERVER_PORT_KEY = "gnmi_port";
+
+    @Override
+    public DeviceDescription discoverDeviceDetails() {
+        return null;
+    }
+
+    @Override
+    public List<PortDescription> discoverPortDetails() {
+        log.info("Discovering port details on device {}", handler().data().deviceId());
+
+        // Get the channel
+        ManagedChannel channel = getChannel();
+
+        if (channel == null) {
+            return ImmutableList.of();
+        }
+
+        // Build the subscribe request
+        SubscribeRequest request = subscribeRequest();
+
+        // New stub
+        gNMIGrpc.gNMIStub gnmiStub = gNMIGrpc.newStub(channel);
+
+        final CompletableFuture<List<PortDescription>>
+                reply = new CompletableFuture<>();
+
+        // Subscribe to the replies
+        StreamObserver<SubscribeRequest> subscribeRequest = gnmiStub
+                .subscribe(new SubscribeResponseObserver(reply));
+        log.debug("Interfaces request {}", request);
+
+        List<PortDescription> ports;
+        try {
+            // Issue the request
+            subscribeRequest.onNext(request);
+            ports = reply.get(REQUEST_TIMEOUT_SECONDS, TimeUnit.SECONDS);
+        } catch (InterruptedException | ExecutionException | TimeoutException
+                | StatusRuntimeException e) {
+            log.warn("Unable to discover ports from {}: {}",
+                     data().deviceId(), e.getMessage());
+            log.debug("{}", e);
+            return ImmutableList.of();
+        } finally {
+            subscribeRequest.onCompleted();
+        }
+
+        return ports;
+    }
+
+    /**
+     * Obtains the ManagedChannel to be used for the communication.
+     *
+     * @return the managed channel
+     */
+    private ManagedChannel getChannel() {
+
+        DeviceId deviceId = handler().data().deviceId();
+        String serverAddr = this.data().value(GNMI_SERVER_ADDR_KEY);
+        String serverPortString = this.data().value(GNMI_SERVER_PORT_KEY);
+
+        GrpcController controller = handler().get(GrpcController.class);
+        ManagedChannel channel = null;
+
+        //FIXME can be optimized
+        //getting a channel if exists.
+        ManagedChannel managedChannel = controller
+                .getChannels(handler().data().deviceId()).stream().filter(c -> {
+                    String[] authority = c.authority().split(":");
+                    String host = authority[0];
+                    String port = authority[1];
+                    return host.equals(serverAddr) && port.equals(serverPortString);
+                }).findAny().orElse(null);
+
+        if (managedChannel != null) {
+            log.debug("Reusing Channel");
+            channel = managedChannel;
+        } else {
+            log.debug("Creating Channel");
+            GrpcChannelId newChannelId = GrpcChannelId.of(deviceId, "gnmi");
+
+            ManagedChannelBuilder channelBuilder = NettyChannelBuilder
+                    .forAddress(serverAddr, Integer.valueOf(serverPortString))
+                    .usePlaintext(true)
+                    .nameResolverFactory(new DnsNameResolverProvider());
+
+            try {
+                channel = controller.connectChannel(newChannelId, channelBuilder);
+            } catch (IOException e) {
+                log.warn("Unable to connect to gRPC server of {}: {}",
+                         deviceId, e.getMessage());
+            }
+        }
+        return channel;
+    }
+
+    /**
+     * Creates the subscribe request for the interfaces.
+     *
+     * @return subscribe request
+     */
+    private SubscribeRequest subscribeRequest() {
+        Path path = Path.newBuilder()
+                .addElem(PathElem.newBuilder().setName("interfaces").build())
+                .addElem(PathElem.newBuilder().setName("interface").build())
+                .addElem(PathElem.newBuilder().setName("...").build())
+                .build();
+        Subscription subscription = Subscription.newBuilder().setPath(path).build();
+        SubscriptionList list = SubscriptionList.newBuilder().setMode(SubscriptionList.Mode.ONCE)
+                .addSubscription(subscription).build();
+        return SubscribeRequest.newBuilder().setSubscribe(list).build();
+    }
+
+    /**
+     * Handles messages received from the device on the stream channel.
+     */
+    private final class SubscribeResponseObserver
+            implements StreamObserver<SubscribeResponse> {
+
+        private final CompletableFuture<List<PortDescription>> reply;
+
+        private SubscribeResponseObserver(CompletableFuture<List<PortDescription>> reply) {
+            this.reply = reply;
+        }
+
+        @Override
+        public void onNext(SubscribeResponse message) {
+            Map<String, DefaultPortDescription.Builder> ports = new HashMap<>();
+            Map<String, DefaultAnnotations.Builder> portsAnnotations = new HashMap<>();
+            log.debug("Response {} ", message.getUpdate().toString());
+            message.getUpdate().getUpdateList().forEach(update -> {
+                parseUpdate(ports, portsAnnotations, update);
+            });
+
+            List<PortDescription> portDescriptionList = new ArrayList<>();
+            ports.forEach((k, v) -> {
+//                v.portSpeed(1000L);
+                v.type(Port.Type.COPPER);
+                v.annotations(portsAnnotations.get(k).set("name", k).build());
+                portDescriptionList.add(v.build());
+            });
+
+            reply.complete(portDescriptionList);
+        }
+
+
+        @Override
+        public void onError(Throwable throwable) {
+            log.warn("Error on stream channel for {}: {}",
+                     data().deviceId(), Status.fromThrowable(throwable));
+            log.debug("{}", throwable);
+        }
+
+        @Override
+        public void onCompleted() {
+            log.debug("SubscribeResponseObserver completed");
+        }
+    }
+
+    /**
+     * Parses the update received from the device.
+     *
+     * @param ports            the ports description to build
+     * @param portsAnnotations the ports annotations list to populate
+     * @param update           the update received
+     */
+    private void parseUpdate(Map<String, DefaultPortDescription.Builder> ports,
+                             Map<String, DefaultAnnotations.Builder> portsAnnotations,
+                             Update update) {
+
+        //FIXME crude parsing, can be done via object (de)serialization
+        if (update.getPath().getElemList().size() > 3) {
+            String name = update.getPath().getElem(3).getName();
+            String portId = update.getPath().getElem(1).getKeyMap().get("name");
+            if (!ports.containsKey(portId)) {
+                int number = Character.getNumericValue(portId.charAt(portId.length() - 1));
+                PortNumber portNumber = PortNumber.portNumber(number, portId);
+                ports.put(portId, DefaultPortDescription.builder()
+                        .withPortNumer(portNumber));
+            }
+            if (name.equals("enabled")) {
+                DefaultPortDescription.Builder builder = ports.get(portId);
+                builder = builder.isEnabled(update.getVal().getBoolVal());
+                ports.put(portId, builder);
+            } else if (name.equals("state")) {
+                String speedName = update.getPath().getElem(4).getName();
+                if (speedName.equals("negotiated-port-speed")) {
+                    DefaultPortDescription.Builder builder = ports.get(portId);
+                    long speed = parsePortSpeed(update.getVal().getStringVal());
+                    builder = builder.portSpeed(speed);
+                    ports.put(portId, builder);
+                }
+            } else if (!name.equals("ifindex")) {
+                if (!portsAnnotations.containsKey(portId)) {
+                    portsAnnotations.put(portId, DefaultAnnotations.builder()
+                            .set(name, update.getVal().toByteString()
+                                    .toString(Charset.defaultCharset()).trim()));
+                } else {
+                    DefaultAnnotations.Builder builder = portsAnnotations.get(portId);
+                    builder = builder.set(name, update.getVal().toByteString().
+                            toString(Charset.defaultCharset()).trim());
+                    portsAnnotations.put(portId, builder);
+                }
+            }
+        }
+    }
+
+    private long parsePortSpeed(String speed) {
+        log.debug("Speed from config {}", speed);
+        switch (speed) {
+            case "SPEED_10MB":
+                return 10;
+            case "SPEED_100MB":
+                return 10;
+            case "SPEED_1GB":
+                return 1000;
+            case "SPEED_10GB":
+                return 10000;
+            case "SPEED_25GB":
+                return 25000;
+            case "SPEED_40GB":
+                return 40000;
+            case "SPEED_50GB":
+                return 50000;
+            case "SPEED_100GB":
+                return 100000;
+            default:
+                return 1000;
+        }
+    }
+}