TransportPCE architecture
-The current version of transportPCE is dedicated to the control of WDM transport
-infrastructure. OTN layer will be integrated in a later step. The WDM layer is
-built from colorless ROADMs and transponders.
+Fluorine, Neon and Sodium releases of transportPCE are dedicated to the control
+of WDM transport infrastructure. The WDM layer is built from colorless ROADMs
+and transponders.
The interest of using a controller to provision automatically services strongly
relies on its ability to handle end to end optical services that spans through
which defines interoperability specifications, consisting of both Optical
interoperability and Yang data models.
+Experimental support of OTN layer is introduced in Magnesium release of
+OpenDaylight. By experimental, we mean not all features can be accessed through
+northbound API based on RESTCONF encoded OpenROADM Service model. In the meanwhile,
+"east/west" APIs shall be used to trigger a path computation in the PCE (using
+path-computation -request RPC) and to create services (using otn-service-path RPC.
+OTN support will be improved in the following magnesium releases.
+
+
+
Module description
~~~~~~~~~~~~~~~~~~
ServiceHandler
^^^^^^^^^^^^^^
-Service Handler handles request coming from a higher level controller or an
-orchestrator through the northbound API, as defined in the Open ROADM service
-model. Current implementation addresses the following rpcs: service-create,
-service–delete, service-reroute.
-It checks the request consistency and trigs path calculation sending rpcs to the
-PCE. If a valid path is returned by the PCE, path configuration is initiated
-relying on Renderer and OLM.
-At the confirmation of a successful service creation, the Service Handler
-updates the service-list in the MD-SAL.
-For service deletion, the Service Handler relies on the Renderer and the OLM to
-delete connections and reset power levels associated with the service.
-The service-list is updated following a successful service deletion.
-
+Service Handler handles request coming from a higher level controller or an orchestrator
+through the northbound API, as defined in the Open ROADM service model. Current
+implementation addresses the following rpcs: service-create, temp-service-create,
+service–delete, temp-service-delete, service-reroute, and service-restoration. It checks the
+request consistency and trigs path calculation sending rpcs to the PCE. If a valid path is
+returned by the PCE, path configuration is initiated relying on Renderer and OLM. At the
+confirmation of a successful service creation, the Service Handler updates the service-
+list/temp-service-list in the MD-SAL. For service deletion, the Service Handler relies on the
+Renderer and the OLM to delete connections and reset power levels associated with the
+service. The service-list is updated following a successful service deletion. In Neon SR0 is
+added the support for service from ROADM to ROADM, which brings additional flexibility and
+notably allows reserving resources when transponders are not in place at day one.
+The full support of OTN services, including OTU, HO-ODU and LO-ODU will be introduced
+in next release of Magnesium.
PCE
^^^^^^^^^^^^^^
The Path Computation Element (PCE) is the component responsible for path
-calculation. An interface allows the Renderer or external components such as an
+calculation. An interface allows the Service Handler or external components such as an
orchestrator to request a path computation and get a response from the PCE
including the computed path(s) in case of success, or errors and indication of
the reason for the failure in case the request cannot be satisfied. Additional
allows keeping PCE aligned with the latest changes in the topology. Information
about current and planned services is available in the MD-SAL data store.
-Current implementation of PCE allows finding the shortest path, minimizing
-either the hop count (default) or the propagation delay. Wavelength is assigned
-considering a fixed grid of 96 wavelengths. Current PCE handles the following
-constraints as hard constraints:
+Current implementation of PCE allows finding the shortest path, minimizing either the hop
+count (default) or the propagation delay. Wavelength is assigned considering a fixed grid of
+96 wavelengths. In Neon SR0, the PCE calculates the OSNR, on the base of incremental
+noise specifications provided in Open RAODM MSA. The support of unidirectional ports is
+also added. PCE handles the following constraints as hard constraints:
- **Node exclusion**
- **SRLG exclusion**
- **Maximum latency**
+In Magnesium SR0, the interconnection of the PCE with GNPY (Gaussian Noise Python), an
+open-source library developed in the scope of the Telecom Infra Project for building route
+planning and optimizing performance in optical mesh networks, is fully supported.
+
+If the OSNR calculated by the PCE is too close to the limit defined in OpenROADM
+specifications, the PCE forwards through a REST interface to GNPY external tool the topology
+and the pre-computed path translated in routing constraints. GNPy calculates a set of Quality of
+Transmission metric for this path using its own library which includes models for OpenROADM.
+The result is sent back to the PCE. If the path is validated, the PCE sends back a response to
+the service handler. In case of invalidation of the path by GNPY, the PCE sends a new request to
+GNPY, including only the constraints expressed in the path-computation-request initiated by the
+Service Handler. GNPy then tries to calculate a path based on these relaxed constraints. The result
+of the path computation is provided to the PCE which translates the path according to the topology
+handled in transportPCE and forwards the results to the Service Handler.
+
+GNPy relies on SNR and takes into account the linear and non-linear impairments to check feasibility.
+In the related tests, GNPy module runs externally in a docker and the communication with T-PCE is
+ensured via HTTPs.
Topology Management
^^^^^^^^^^^^^^^^^^^^^^^^
Topology management module builds the Topology according to the Network model
-defined in OpenROADM. The topology is aligned with I2RS model. It includes
-several network layers:
+defined in OpenROADM. The topology is aligned with IETF I2RS RFC8345 model.
+It includes several network layers:
- **CLLI layer corresponds to the locations that host equipment**
- **Network layer corresponds to a first level of disaggregation where we
- **Topology layer introduces a second level of disaggregation where ROADMs
Add/Drop modules ("SRGs") are separated from the degrees which includes line
amplifiers and WSS that switch wavelengths from one to another degree**
+- **OTN layer introduced in Magnesium includes transponders as well as switch-ponders
+ having the ability to switch OTN containers from client to line cards. SR0 release
+ includes creation of the switching pool (used to model cross-connect matrices),
+ tributary-ports and tributary-slots at the initial connection of NETCONF devices.
+ However, the population of OTN links, and the adjustment of the tributary ports/slots
+ pull occupancy when OTN services are created will be handled in later Magnesium release.**
-OTN layer which includes OTN elements having or not the ability to switch OTN
-containers from client to line cards is not currently implemented.
Renderer
^^^^^^^^
-The Renderer module, on request coming from the Service Handler through a
-service-implementation-request /service delete rpc, sets/deletes the path
-corresponding to a specific service between A and Z ends.
-It first checks what are the existing interfaces on the ports of the different
-nodes that the path crosses. It then creates missing interfaces. After all
-needed interfaces have been created it sets the connections required in the
-nodes and notifies the Service Handler on the status of the path creation.
-Path is created in 2 steps (from A to Z and Z to A). In case the path between
-A and Z could not be fully created, a rollback function is called to set the
-equipment on the path back to their initial configuration (as they were before
-invoking the Renderer).
+The Renderer module, on request coming from the Service Handler through a service-
+implementation-request /service delete rpc, sets/deletes the path corresponding to a specific
+service between A and Z ends. The path description provided by the service-handler to the
+renderer is based on abstracted resources (nodes, links and termination-points), as provided
+by the PCE module. The renderer converts this path-description in a path topology based on
+device resources (circuit-packs, ports,…).
+
+The conversion from abstracted resources to device resources is performed relying on the
+portmapping module which maintains the connections between these different resource types.
+Portmapping module also allows to keep the topology independant from the devices releases.
+In Neon (SR0), portmapping module has been enriched to support both openroadm 1.2.1 and 2.2.1
+device models. The full support of openroadm 2.2.1 device models (both in the topology management
+and the renderingfunction) has been added in Neon SR1. In Magnesium, portmapping is enriched with
+the supported-interface-capability, OTN supporting-interfaces, and switching-pools (reflecting
+cross-connection capabilities of OTN switch-ponders).
+
+After the path is provided, the renderer first checks what are the existing interfaces on the
+ports of the different nodes that the path crosses. It then creates missing interfaces. After all
+needed interfaces have been created it sets the connections required in the nodes and
+notifies the Service Handler on the status of the path creation. Path is created in 2 steps
+(from A to Z and Z to A). In case the path between A and Z could not be fully created, a
+rollback function is called to set the equipment on the path back to their initial configuration
+(as they were before invoking the Renderer).
+
+Magnesium brings the support of OTN services. SR0 supports the creation of OTU4, ODU4, ODU2/ODU2e
+and ODU1 interfaces. The creation of these interfaces must be triggered through otn-service-path
+RPC. Full support (service-implementation-request /service delete rpc, topology alignement after
+the service has been created) will be provided in later releases of Magnesium.
+
OLM
^^^^^^^^
- service-reroute (given service-name, service-aend, service-zend)
+ - service-restoration (given service-name, service-aend, service-zend)
+
+ - temp-service-create (given common-id, service-aend, service-zend)
+
+ - temp-service-delete (given common-id)
+
- Data structure
- - service list : composed of services
+ - service list : made of services
+ - temp-service list : made of temporary services
- service : composed of service-name, topology wich describes the detailed path (list of used resources)
- Notification
- node list : composed of netconf nodes in topology-netconf
-
Internal APIs
~~~~~~~~~~~~~
- service-delete (given service-name)
+ - otn-service-path (given service-name, service-aend, service-zend) used in SR0 as
+ an intermediate solution to address directly the renderer from a REST NBI for
+ otn-service creation. Otn service-creation through service-implementation-request
+ call from the Service Handler will be supported in later Magnesium releases
+
- Data structure
- service path list : composed of service paths
- calculate-spanloss-current
+odl-transportpce-stubmodels
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+ - This feature provides function to be able to stub some of TransportPCE modules, pce and
+ renderer (Stubpce and Stubrenderer).
+ Stubs are used for development purposes and can be used for some of the functionnal tests.
+
+Interfaces to external software
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+It defines the interfaces implemented to interconnect TransportPCE modules with other software in
+order to perform specific tasks
+
+GNPy interface
+^^^^^^^^^^^^^^
+
+- Request structure
+
+ - topology : composed of list of elements and connections
+ - service : source, destination, explicit-route-objects, path-constraints
+
+- Response structure
+
+ - path-properties/path-metric : OSNR-0.1nm, OSNR-bandwidth, SNR-0.1nm, SNR-bandwidth,
+ - path-properties/path-route-objects : composed of path elements
+
Running transportPCE project
----------------------------
"node": [
{
"node-id": "<node-id>",
- "netconf-node-topology:tcp-only": "false",
- "netconf-node-topology:reconnect-on-changed-schema": "false",
- "netconf-node-topology:host": "<node-ip-address>",
- "netconf-node-topology:default-request-timeout-millis": "120000",
- "netconf-node-topology:max-connection-attempts": "0",
- "netconf-node-topology:sleep-factor": "1.5",
- "netconf-node-topology:actor-response-wait-time": "5",
- "netconf-node-topology:concurrent-rpc-limit": "0",
- "netconf-node-topology:between-attempts-timeout-millis": "2000",
- "netconf-node-topology:port": "<netconf-port>",
- "netconf-node-topology:connection-timeout-millis": "20000",
- "netconf-node-topology:username": "<node-username>",
- "netconf-node-topology:password": "<node-password>",
- "netconf-node-topology:keepalive-delay": "300"
+ "netconf-node-topology:tcp-only": "false",
+ "netconf-node-topology:reconnect-on-changed-schema": "false",
+ "netconf-node-topology:host": "<node-ip-address>",
+ "netconf-node-topology:default-request-timeout-millis": "120000",
+ "netconf-node-topology:max-connection-attempts": "0",
+ "netconf-node-topology:sleep-factor": "1.5",
+ "netconf-node-topology:actor-response-wait-time": "5",
+ "netconf-node-topology:concurrent-rpc-limit": "0",
+ "netconf-node-topology:between-attempts-timeout-millis": "2000",
+ "netconf-node-topology:port": "<netconf-port>",
+ "netconf-node-topology:connection-timeout-millis": "20000",
+ "netconf-node-topology:username": "<node-username>",
+ "netconf-node-topology:password": "<node-password>",
+ "netconf-node-topology:keepalive-delay": "300"
}
]
}
.. note::
- In ``org-openroadm-device.yang``, two types of optical nodes can be managed:
+ In ``org-openroadm-device.yang``, four types of optical nodes can be managed:
* rdm: ROADM device (optical switch)
* xpdr: Xponder device (device that converts client to optical channel interface)
+ * ila: in line amplifier (optical amplifier)
+ * extplug: external pluggable (an optical pluggable that can be inserted in an external unit such as a router)
+
+ TransportPCE currently supports rdm and xpdr
Depending on the kind of open ROADM device connected, different kind of *Logical Connection Points*
should appear, if the node configuration is not empty:
}
}
+OTN topology
+~~~~~~~~~~~~
+
+Before creating an OTN service, your topology must contain at least two xpdr devices of MUXPDR or
+SWITCH type connected to two different rdm devices. To check that these xpdr are present in the
+OTN topology, use the following command on the REST API :
+
+**REST API** : *GET /restconf/config/ietf-network:network/otn-topology*
+
+An optical connectivity service shall have been created in a first setp. In Magnesium SR0, the OTN
+links are not automatically populated in the topology after the Och, OTU4 and ODU4 interfaces have
+been created on the two network ports of the xpdr. Thus the otn link must be posted manually through
+the REST API (APIDoc).
+
+**REST API** : *POST /restconf/config/ietf-network:network/otn-topology/link*
+**REST API** : to complete
+
Creating a service
~~~~~~~~~~~~~~~~~~
+In Magnesium SR0, two different kind of services can be created with transportPCE using the Northbound
+REST API:
+
+- 100GE services from client port to client port of two transponders (TPDR)
+- an OTU-4/ODU-4 service from network port to network port of two Xponders (MUXPDR/SWITCH)
+
+For the creation of 1GE and 10GE services the user has to check using internal API the connectivity
+between nodes and the possibility to create a service through the path-computation-request rpc. The
+service creation is performed using internal otn-service-path rpc.
+
+100GE service creation:
+^^^^^^^^^^^^^^^^^^^^^^^
+
Use the following REST RPC to invoke *service handler* module in order to create a bidirectional
end-to-end optical connectivity service between two xpdr over an optical network composed of rdm
nodes.
.. code:: json
{
- "input": {
- "sdnc-request-header": {
- "request-id": "request-1",
- "rpc-action": "service-create",
- "request-system-id": "appname"
- },
- "service-name": "test1",
- "common-id": "commonId",
- "connection-type": "service",
- "service-a-end": {
- "service-rate": "100",
- "node-id": "<xpdr-node-id>",
- "service-format": "Ethernet",
- "clli": "<ccli-name>",
- "tx-direction": {
- "port": {
- "port-device-name": "<xpdr-client-port>",
- "port-type": "fixed",
- "port-name": "<xpdr-client-port-number>",
- "port-rack": "000000.00",
- "port-shelf": "Chassis#1"
- },
- "lgx": {
- "lgx-device-name": "Some lgx-device-name",
- "lgx-port-name": "Some lgx-port-name",
- "lgx-port-rack": "000000.00",
- "lgx-port-shelf": "00"
- }
- },
- "rx-direction": {
- "port": {
- "port-device-name": "<xpdr-client-port>",
- "port-type": "fixed",
- "port-name": "<xpdr-client-port-number>",
- "port-rack": "000000.00",
- "port-shelf": "Chassis#1"
- },
- "lgx": {
- "lgx-device-name": "Some lgx-device-name",
- "lgx-port-name": "Some lgx-port-name",
- "lgx-port-rack": "000000.00",
- "lgx-port-shelf": "00"
- }
- },
- "optic-type": "gray"
- },
- "service-z-end": {
- "service-rate": "100",
- "node-id": "<xpdr-node-id>",
- "service-format": "Ethernet",
- "clli": "<ccli-name>",
- "tx-direction": {
- "port": {
- "port-device-name": "<xpdr-client-port>",
- "port-type": "fixed",
- "port-name": "<xpdr-client-port-number>",
- "port-rack": "000000.00",
- "port-shelf": "Chassis#1"
- },
- "lgx": {
- "lgx-device-name": "Some lgx-device-name",
- "lgx-port-name": "Some lgx-port-name",
- "lgx-port-rack": "000000.00",
- "lgx-port-shelf": "00"
- }
- },
- "rx-direction": {
- "port": {
- "port-device-name": "<xpdr-client-port>",
- "port-type": "fixed",
- "port-name": "<xpdr-client-port-number>",
- "port-rack": "000000.00",
- "port-shelf": "Chassis#1"
- },
- "lgx": {
- "lgx-device-name": "Some lgx-device-name",
- "lgx-port-name": "Some lgx-port-name",
- "lgx-port-rack": "000000.00",
- "lgx-port-shelf": "00"
- }
- },
- "optic-type": "gray"
- },
- "due-date": "yyyy-mm-ddT00:00:01Z",
- "operator-contact": "some-contact-info"
- }
+ "input": {
+ "sdnc-request-header": {
+ "request-id": "request-1",
+ "rpc-action": "service-create",
+ "request-system-id": "appname"
+ },
+ "service-name": "test1",
+ "common-id": "commonId",
+ "connection-type": "service",
+ "service-a-end": {
+ "service-rate": "100",
+ "node-id": "<xpdr-node-id>",
+ "service-format": "Ethernet",
+ "clli": "<ccli-name>",
+ "tx-direction": {
+ "port": {
+ "port-device-name": "<xpdr-client-port>",
+ "port-type": "fixed",
+ "port-name": "<xpdr-client-port-number>",
+ "port-rack": "000000.00",
+ "port-shelf": "Chassis#1"
+ },
+ "lgx": {
+ "lgx-device-name": "Some lgx-device-name",
+ "lgx-port-name": "Some lgx-port-name",
+ "lgx-port-rack": "000000.00",
+ "lgx-port-shelf": "00"
+ }
+ },
+ "rx-direction": {
+ "port": {
+ "port-device-name": "<xpdr-client-port>",
+ "port-type": "fixed",
+ "port-name": "<xpdr-client-port-number>",
+ "port-rack": "000000.00",
+ "port-shelf": "Chassis#1"
+ },
+ "lgx": {
+ "lgx-device-name": "Some lgx-device-name",
+ "lgx-port-name": "Some lgx-port-name",
+ "lgx-port-rack": "000000.00",
+ "lgx-port-shelf": "00"
+ }
+ },
+ "optic-type": "gray"
+ },
+ "service-z-end": {
+ "service-rate": "100",
+ "node-id": "<xpdr-node-id>",
+ "service-format": "Ethernet",
+ "clli": "<ccli-name>",
+ "tx-direction": {
+ "port": {
+ "port-device-name": "<xpdr-client-port>",
+ "port-type": "fixed",
+ "port-name": "<xpdr-client-port-number>",
+ "port-rack": "000000.00",
+ "port-shelf": "Chassis#1"
+ },
+ "lgx": {
+ "lgx-device-name": "Some lgx-device-name",
+ "lgx-port-name": "Some lgx-port-name",
+ "lgx-port-rack": "000000.00",
+ "lgx-port-shelf": "00"
+ }
+ },
+ "rx-direction": {
+ "port": {
+ "port-device-name": "<xpdr-client-port>",
+ "port-type": "fixed",
+ "port-name": "<xpdr-client-port-number>",
+ "port-rack": "000000.00",
+ "port-shelf": "Chassis#1"
+ },
+ "lgx": {
+ "lgx-device-name": "Some lgx-device-name",
+ "lgx-port-name": "Some lgx-port-name",
+ "lgx-port-rack": "000000.00",
+ "lgx-port-shelf": "00"
+ }
+ },
+ "optic-type": "gray"
+ },
+ "due-date": "yyyy-mm-ddT00:00:01Z",
+ "operator-contact": "some-contact-info"
+ }
}
Most important parameters for this REST RPC are the identification of the two physical client ports
on xpdr nodes.This RPC invokes the *PCE* module to compute a path over the *openroadm-topology* and
then invokes *renderer* and *OLM* to implement the end-to-end path into the devices.
+OTU4/ODU4 service creation :
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Use the following REST RPC to invoke *service handler* module in order to create a bidirectional
+end-to-end optical connectivity service between two xpdr over an optical network composed of rdm
+nodes.
+
+XXXXXXXXXXXXXXX (TO BE COMPLETED )XXXXXXXXXXXXXXXXX
+
+
+1GE/ODU0 and 10GE/ODU2e service creation :
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Use the following REST RPC to invoke *PCE* module in order to check connectivity between xponder
+nodes and the availability of a supporting optical connectivity between the network-ports of the
+nodes.
+
+**REST API** : to complete
+
+After end-to-end optical connectivity between the two xpdr has been checked, use the otn-service-path
+rpc to invoke the *Renderer* and create the corresponding interfaces :
+
+- 1GE and ODU0 interfaces for 1GE services
+- 10GE and ODU2e interfaces for 10GE services
+
+The following example corresponds to the creation of a 10GE service
+
+**REST API** : to complete
+
+.. note::
+ OTN links are not automatically populated in the topology after the ODU2e interfaces have
+ been created on the two client ports of the xpdr. The otn link can be posted manually through
+ the REST API (APIDoc).
+
+.. note::
+ With Magnesium SR0, the service-list corresponding to 1GE/10GE and OTU4/ODU4 services is not
+ updated in the datastore after the interfaces have been created in the device.
+
Deleting a service
~~~~~~~~~~~~~~~~~~
+**REST API** : to complete according to what can be done with 100GE/OTU4/1GE/10GE services
+
+Deleting a 100GE service
+^^^^^^^^^^^^^^^^^^^^^^^^
+
Use the following REST RPC to invoke *service handler* module in order to delete a given optical
connectivity service.
.. code:: json
{
- "input": {
- "sdnc-request-header": {
- "request-id": "request-1",
- "rpc-action": "service-delete",
- "request-system-id": "appname",
- "notification-url": "http://localhost:8585/NotificationServer/notify"
- },
- "service-delete-req-info": {
- "service-name": "test1",
- "tail-retention": "no"
- }
- }
+ "input": {
+ "sdnc-request-header": {
+ "request-id": "request-1",
+ "rpc-action": "service-delete",
+ "request-system-id": "appname",
+ "notification-url": "http://localhost:8585/NotificationServer/notify"
+ },
+ "service-delete-req-info": {
+ "service-name": "test1",
+ "tail-retention": "no"
+ }
+ }
}
Most important parameters for this REST RPC is the *service-name*.
Help
----
-- `TransportPCE Wiki <https://wiki.opendaylight.org/view/TransportPCE:Main>`__
+- `TransportPCE Wiki archive <https://wiki-archive.opendaylight.org/view/TransportPCE:Main>`__
- TransportPCE Mailing List
(`developer <https://lists.opendaylight.org/mailman/listinfo/transportpce-dev>`__)
Code Review / transportpce.git / blobdiff