3 Virtual Tenant Network (VTN)
4 ============================
6 OpenDaylight Virtual Tenant Network (VTN) Overview
7 --------------------------------------------------
9 OpenDaylight Virtual Tenant Network (VTN) is an application that
10 provides multi-tenant virtual network on an SDN controller.
12 Conventionally, huge investment in the network systems and operating
13 expenses are needed because the network is configured as a silo for each
14 department and system. Therefore various network appliances must be
15 installed for each tenant and those boxes cannot be shared with others.
16 It is a heavy work to design, implement and operate the entire complex
19 The uniqueness of VTN is a logical abstraction plane. This enables the
20 complete separation of logical plane from physical plane. Users can
21 design and deploy any desired network without knowing the physical
22 network topology or bandwidth restrictions.
24 VTN allows the users to define the network with a look and feel of
25 conventional L2/L3 network. Once the network is designed on VTN, it will
26 automatically be mapped into underlying physical network, and then
27 configured on the individual switch leverage SDN control protocol. The
28 definition of logical plane makes it possible not only to hide the
29 complexity of the underlying network but also to better manage network
30 resources. It achieves reducing reconfiguration time of network services
31 and minimizing network configuration errors. OpenDaylight Virtual Tenant
32 Network (VTN) is an application that provides multi-tenant virtual
33 network on an SDN controller. It provides API for creating a common
34 virtual network irrespective of the physical network.
36 .. figure:: ./images/vtn/vtn-overview.png
37 :alt: VTN Architecture
41 It is implemented as two major components
45 - :ref:`vtn-coordinator`
52 An OpenDaylight Plugin that interacts with other modules to implement
53 the components of the VTN model. It also provides a REST interface to
54 configure VTN components in OpenDaylight. VTN Manager is implemented as
55 one plugin to the OpenDaylight. This provides a REST interface to
56 create/update/delete VTN components. The user command in VTN Coordinator
57 is translated as REST API to VTN Manager by the OpenDaylight Driver
58 component. In addition to the above mentioned role, it also provides an
59 implementation to the OpenStack L2 Network Functions API.
64 The table identifies the functions and the interface used by VTN
67 +--------------------------+--------------------------+--------------------------+
68 | Component | Interface | Purpose |
69 +==========================+==========================+==========================+
70 | VTN Manager | RESTful API | Configure VTN |
71 | | | Virtualization model |
74 +--------------------------+--------------------------+--------------------------+
75 | VTN Manager | Neutron API | Handle Networks API from |
76 | | implementation | OpenStack (Neutron |
78 +--------------------------+--------------------------+--------------------------+
79 | VTN Coordinator | RESTful API | (1) Uses the RESTful |
80 | | | interface of VTN |
81 | | | Manager and configures |
82 | | | VTN Virtualization |
83 | | | model components in |
85 | | | (2) Handles multiple |
87 | | | orchestration. |
88 | | | (3) Provides API to |
89 | | | read the physical |
90 | | | network details. See |
91 | | | `samples <https://wiki |
92 | | | .OpenDaylight.org/view/O |
93 | | | penDaylight_Virtual_Tena |
94 | | | nt_Network_(VTN):VTN_Coo |
95 | | | rdinator:RestApi:L2_Netw |
96 | | | ork_Example_Using_VTN_Vi |
97 | | | rtualization>`__ |
99 +--------------------------+--------------------------+--------------------------+
104 There are three features
106 - **odl-vtn-manager** provides VTN Manager’s JAVA API.
108 - **odl-vtn-manager-rest** provides VTN Manager’s REST API.
110 - **odl-vtn-manager-neutron** provides the integration with Neutron
113 REST Conf documentation for VTN Manager, please refer to:
114 https://nexus.opendaylight.org/content/sites/site/org.opendaylight.vtn/boron/manager.model/apidocs/index.html
117 For VTN Java API documentation, please refer to:
118 https://nexus.opendaylight.org/content/sites/site/org.opendaylight.vtn/boron/apidocs/index.html
120 Once the Karaf distribution is up, install dlux and apidocs.
124 feature:install odl-dlux-all odl-mdsal-apidocs
129 To Log in to DLUX, after installing the application:
131 - Open a browser and enter the login URL as
132 http://<OpenDaylight-IP>:8181/index.html
136 Replace "<OpenDaylight-IP>" with the IP address of OpenDaylight
137 based on your environment.
139 - Login to the application with user ID and password credentials as
144 admin is the only default user available for DLUX in this release.
146 - In the right hand side frame, click "Yang UI".
148 YANG documentation for VTN Manager, please refer to:
149 https://nexus.opendaylight.org/content/sites/site/org.opendaylight.vtn/boron/manager.model/apidocs/index.html
156 The VTN Coordinator is an external application that provides a REST
157 interface for an user to use OpenDaylight VTN Virtualization. It
158 interacts with the VTN Manager plugin to implement the user
159 configuration. It is also capable of multiple OpenDaylight
160 orchestration. It realizes VTN provisioning in OpenDaylight instances.
161 In the OpenDaylight architecture VTN Coordinator is part of the network
162 application, orchestration and services layer. VTN Coordinator will use
163 the REST interface exposed by the VTN Manger to realize the virtual
164 network using OpenDaylight. It uses OpenDaylight APIs (REST) to
165 construct the virtual network in OpenDaylight instances. It provides
166 REST APIs for northbound VTN applications and supports virtual networks
167 spanning across multiple OpenDaylight by coordinating across
170 VTN Coordinator Components:
172 - Transaction Coordinator
174 - Unified Provider Physical Layer (UPPL)
176 - Unified Provider Logical LAyer (UPLL)
178 - OpenDaylight Controller Diver (ODC Driver)
180 OpenDaylight Virtual Tenant Network (VTN) API Overview
181 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
183 The VTN API module is a sub component of the VTN Coordinator and
184 provides the northbound REST API interface for VTN applications. It
185 consists of two subcomponents:
189 - VTN service Java API Library
191 .. figure:: ./images/vtn/vtn-coordinator-api-architecture.png
192 :alt: VTN-Coordinator\_api-architechture
194 VTN-Coordinator\_api-architechture
199 The Web Server module handles the REST APIs received from the VTN
200 applications. It translates the REST APIs to the appropriate Java APIs.
202 The main functions of this module are:
204 - Starts via the startup script ``catalina.sh``.
206 - VTN Application sends HTTP request to Web server in XML or JSON
209 - Creates a session and acquire a read/write lock.
211 - Invokes the VTN Service Java API Library corresponding to the
214 - Returns the response to the VTN Application.
216 WebServer Class Details
217 '''''''''''''''''''''''
219 The list below shows the classes available for Web Server module and
223 It is a singleton class for executing the acquisition of
224 configuration information from properties file, log initialization,
225 initialization of VTN Service Java API Library. Executed by init()
226 of VtnServiceWebAPIServlet.
228 Configuration Manager
229 Maintains the configuration information acquired from properties
238 VtnServiceWebAPIServlet
239 Receives HTTP request from VTN Application and calls the method of
240 corresponding VtnServiceWebAPIHandler. herits class HttpServlet, and
241 overrides doGet(), doPut(), doDelete(), doPost().
243 VtnServiceWebAPIHandler
244 Creates JsonObject(com.google.gson) from HTTP request, and calls
245 method of corresponding VtnServiceWebAPIController.
247 VtnServiceWebAPIController
248 Creates RestResource() class and calls UPLL API/UPPL API through
249 Java API. the time of calling UPLL API/UPPL API, performs the
250 creation/deletion of session, acquisition/release of configuration
251 mode, acquisition/release of read lock by TC API through Java API.
254 Converts HTTP request to JsonObject and JsonXML to JSON.
256 VTN Service Java API Library
257 ''''''''''''''''''''''''''''
259 It provides the Java API library to communicate with the lower layer
260 modules in the VTN Coordinator. The main functions of this library are:
262 - Creates an IPC client session to the lower layer.
264 - Converts the request to IPC framework format.
266 - Invokes the lower layer API (i.e. UPPL API, UPLL API, TC API).
268 - Returns the response from the lower layer to the web server
270 - VTN Service Java API Library Class Details
275 VTN Coordinator doesn’t have Karaf features.
277 For VTN Coordinator REST API, please refer to:
278 https://wiki.opendaylight.org/view/OpenDaylight_Virtual_Tenant_Network_%28VTN%29:VTN_Coordinator:RestApi
283 - `L2 Network using Single
284 Controller <https://wiki.OpenDaylight.org/view/OpenDaylight_Virtual_Tenant_Network_(VTN):VTN_Coordinator:RestApi:How_to_configure_L2_Network_with_Single_Controller>`__