diff --git a/src/main/java/net/onrc/onos/core/topology/SwitchType.java b/src/main/java/net/onrc/onos/core/topology/SwitchType.java
new file mode 100644
index 0000000..062a7ee
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/topology/SwitchType.java
@@ -0,0 +1,5 @@
+package net.onrc.onos.core.topology;
+
+public enum SwitchType {
+    ETHERNET_SWITCH, OPTICAL_SWITCH;
+}