Added default link description & model entities.
diff --git a/net/api/src/main/java/org/onlab/onos/net/DefaultLink.java b/net/api/src/main/java/org/onlab/onos/net/DefaultLink.java
new file mode 100644
index 0000000..b21b91c
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/net/DefaultLink.java
@@ -0,0 +1,62 @@
+package org.onlab.onos.net;
+
+import org.onlab.onos.net.link.LinkDescription;
+
+import java.util.Objects;
+
+import static com.google.common.base.Objects.toStringHelper;
+
+/**
+ * Default infrastructure link model implementation.
+ */
+public class DefaultLink implements LinkDescription {
+
+ private ConnectPoint src;
+ private ConnectPoint dst;
+
+ /**
+ * Creates a link description using the supplied information.
+ *
+ * @param src link source
+ * @param dst link destination
+ */
+ public DefaultLink(ConnectPoint src, ConnectPoint dst) {
+ this.src = src;
+ this.dst = dst;
+ }
+
+ @Override
+ public ConnectPoint src() {
+ return src;
+ }
+
+ @Override
+ public ConnectPoint dst() {
+ return dst;
+ }
+
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(src, dst);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (obj instanceof DefaultDevice) {
+ final DefaultLink other = (DefaultLink) obj;
+ return Objects.equals(this.src, other.src) &&
+ Objects.equals(this.dst, other.dst);
+ }
+ return false;
+ }
+
+ @Override
+ public String toString() {
+ return toStringHelper(this)
+ .add("src", src)
+ .add("dst", dst)
+ .toString();
+ }
+
+}