diff --git a/net/core/src/main/java/org/onlab/onos/net/impl/GreetManager.java b/net/core/src/main/java/org/onlab/onos/net/impl/GreetManager.java
new file mode 100644
index 0000000..65a42bc
--- /dev/null
+++ b/net/core/src/main/java/org/onlab/onos/net/impl/GreetManager.java
@@ -0,0 +1,52 @@
+package org.onlab.onos.net.impl;
+
+import com.google.common.collect.ImmutableSet;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.onos.net.GreetService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Trivial implementation of the seed service to demonstrate component and
+ * service annotations.
+ */
+@Component(immediate = true)
+@Service
+public class GreetManager implements GreetService {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private final Set<String> names = new HashSet<>();
+
+    @Override
+    public synchronized String yo(String name) {
+        checkNotNull(name, "Name cannot be null");
+        names.add(name);
+        log.info("Greeted '{}'", name);
+        return "Whazup " + name + "?";
+    }
+
+    @Override
+    public synchronized Iterable<String> names() {
+        return ImmutableSet.copyOf(names);
+    }
+
+    @Activate
+    public void activate() {
+        log.info("SeedManager started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("SeedManager stopped");
+    }
+
+}
diff --git a/net/core/src/main/java/org/onlab/onos/net/impl/SomeOtherComponent.java b/net/core/src/main/java/org/onlab/onos/net/impl/SomeOtherComponent.java
new file mode 100644
index 0000000..c53ab04
--- /dev/null
+++ b/net/core/src/main/java/org/onlab/onos/net/impl/SomeOtherComponent.java
@@ -0,0 +1,36 @@
+package org.onlab.onos.net.impl;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.onos.net.GreetService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Example of a component that does not provide any service, but consumes one.
+ */
+@Component(immediate = true)
+public class SomeOtherComponent {
+
+    private final Logger log = LoggerFactory.getLogger(SomeOtherComponent.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected GreetService service;
+    // protected to allow injection for testing;
+    // alternative is to write bindSeedService and unbindSeedService, which is more code
+
+    @Activate
+    public void activate() {
+        log.info("SomeOtherComponent started");
+        service.yo("neighbour");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("SomeOtherComponent stopped");
+    }
+
+}
diff --git a/net/core/src/main/javadoc/org/onlab/onos/net/impl/package.html b/net/core/src/main/javadoc/org/onlab/onos/net/impl/package.html
new file mode 100644
index 0000000..ba285bd
--- /dev/null
+++ b/net/core/src/main/javadoc/org/onlab/onos/net/impl/package.html
@@ -0,0 +1,3 @@
+<body>
+ONOS core implementations.
+</body>
\ No newline at end of file
diff --git a/net/core/src/test/java/org/onlab/onos/net/impl/GreetManagerTest.java b/net/core/src/test/java/org/onlab/onos/net/impl/GreetManagerTest.java
new file mode 100644
index 0000000..9c05f20
--- /dev/null
+++ b/net/core/src/test/java/org/onlab/onos/net/impl/GreetManagerTest.java
@@ -0,0 +1,31 @@
+package org.onlab.onos.net.impl;
+
+import org.junit.Test;
+import org.onlab.onos.net.GreetService;
+
+import java.util.Iterator;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+/**
+ * Example of a component &amp; service implementation unit test.
+ */
+public class GreetManagerTest {
+
+    @Test
+    public void basics() {
+        GreetService service = new GreetManager();
+        assertEquals("incorrect greeting", "Whazup dude?", service.yo("dude"));
+
+        Iterator<String> names = service.names().iterator();
+        assertEquals("incorrect name", "dude", names.next());
+        assertFalse("no more names expected", names.hasNext());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void nullArg() {
+        new GreetManager().yo(null);
+    }
+
+}