+Get V2 auth token
+-----------------
+
+# VIO openstack support keystone V2 version, vio proxy-plugin will check the request body format, if request body format
+# is keystone V2 format will access keystone V2 service, if not it will access keystone V3 service.
+# this example show how to access keystone V2 service.
+.. code-block:: console
+
+ $ curl -X POST -d @testV2.json -H 'Content-Type:application/json' http://$msb_address/api/multicloud/v0/<vimid>/identity/v2.0/tokens
+
+testV2.json content:
+
+::
+
+ {
+ "auth": {
+ "tenantName": "admin",
+ "passwordCredentials": {
+ "username": "admin",
+ "password": "vmware"
+ }
+ }
+ }
+
+
+Response:
+There are a large amounts of data including service endpoint, user information, etc.
+For our testing We take nova and identity service endpoint address and auth token which is in response header named “X-Subject-Token”.
+
+# you can find the endpoint url namespace is "api/multicloiud-vio/v0", it represent the multicloud-vio service, So
+requests sending to mulitcloud-vio will be forwarded to backend VIO openstack.
+
+
+Identity endpoint:
+ http://$msb_address/api/multicloud-vio/v0/<vimid>/identity
+
+Nova endpoint:
+ http://$msb_address/api/multicloud-vio/v0/<vimid>/nova/<user-tenantid>
+
+
+Get V3 auth token
+-----------------