Initial set of Fabric switch test cases

Change-Id: I86fd2b67d3b773aa496f5ef61f1e1fdf51fd9925
diff --git a/Fabric/Utilities/platforms/eth.py b/Fabric/Utilities/platforms/eth.py
new file mode 100644
index 0000000..056edce
--- /dev/null
+++ b/Fabric/Utilities/platforms/eth.py
@@ -0,0 +1,44 @@
+
+# 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.
+
+
+"""
+Eth platform
+
+This platform uses the --interface command line option to choose the ethernet interfaces.
+"""
+
+def platform_config_update(config):
+    """
+    Update configuration for the local platform
+
+    @param config The configuration dictionary to use/update
+    """
+
+    port_map = {}
+
+    for (ofport, interface) in config["interfaces"]:
+        port_map[ofport] = interface
+
+    # Default to a veth configuration compatible with the reference switch
+    if not port_map:
+        port_map = {
+            1: 'veth1',
+            2: 'veth3',
+            3: 'veth5',
+            4: 'veth7',
+        }
+
+    config['port_map'] = port_map