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diff --git a/docs/scenarios/os-odl_l2-sfc-noha/scenario.description.rst b/docs/scenarios/os-odl_l2-sfc-noha/scenario.description.rst new file mode 100644 index 00000000..b5d41044 --- /dev/null +++ b/docs/scenarios/os-odl_l2-sfc-noha/scenario.description.rst @@ -0,0 +1,118 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) <optionally add copywriters name> + +Introduction +============ +.. In this section explain the purpose of the scenario and the types of capabilities provided +The os-odl_l2-sfc-noha is intended to be used to install the OPNFV SFC project in a standard +OPNFV Non-High Availability mode. The OPNFV SFC project integrates the OpenDaylight SFC +project into the OPNFV environment. The OPNFV SFC Colorado release uses the OpenDaylight +Boron release. + +Scenario components and composition +=================================== +.. In this section describe the unique components that make up the scenario, +.. what each component provides and why it has been included in order +.. to communicate to the user the capabilities available in this scenario. + +This scenario installs everything needed to use the SFC OpenDaylight project in an OPNFV +environment. Since this scenario is Non-High Availability, then only one controller and +one compute node will be deployed. The classifier used in this scenario is implemented +by the Netvirt OpenDaylight project. + +Following is a detailed list of what is included with this scenario: + +OpenDaylight features installed +------------------------------- + +The OpenDaylight SDN controller is installed in the controller node. + +The following are the SFC features that get installed: + +- odl-sfc-model +- odl-sfc-provider +- odl-sfc-provider-rest +- odl-sfc-ovs +- odl-sfc-openflow-renderer + +The following are the Netvirt features that get installed: + +- odl-ovsdb-openstack +- odl-mdsal-xsql +- odl-neutron-service +- odl-neutron-northbound-api +- odl-neutron-spi +- odl-neutron-transcriber +- odl-mdsal-apidocs +- odl-ovsdb-southbound-impl-rest +- odl-ovsdb-southbound-impl-ui + +By simply installing the odl-ovsdb-openstack feature, all the dependant features +will automatically be installed. + +The VNF Manager +--------------- + +In order to create a VM for each Service Function, a VNF Manager is needed. The OPNFV +SFC project currently uses the Tacker OpenStack project as a VNF Manager. Tacker is +installed on the controller node and manages VNF life cycle, and coordinates VM creation +with the OpenDaylight SFC project. + +Scenario usage overview +======================= +.. Provide a brief overview on how to use the scenario and the features available to the +.. user. This should be an "introduction" to the userguide document, and explicitly link to it, +.. where the specifics of the features are covered including examples and API's + +Once this scenario is installed, it will be possible to create Service Chains and +classification entries to map tenant traffic to individual, pre-defined Service Chains. +All configuration can be performed using the Tacker CLI. + +Limitations, Issues and Workarounds +=================================== +.. Explain scenario limitations here, this should be at a design level rather than discussing +.. faults or bugs. If the system design only provide some expected functionality then provide +.. some insight at this point. + +Specific version of OVS +----------------------- + +SFC needs changes in OVS to include the Network Service Headers (NSH) Service Chaining +encapsulation. This OVS patch has been ongoing for quite a while (2 years+), and still +has not been officially merged. Previously, SFC used NSH from a branched version of OVS +based on 2.3.90, called the "Pritesh Patch". In the OpenDaylight Boron release, SFC was +changed to use a newer, branched version of OVS based on 2.5.90, called the "Yi Yang +Patch". + +The older version of OVS only supported VXLAN-GPE + NSH encapsulation, but the newer +version supports both ETH + NSH and VXLAN-GPE + ETH + NSH. Currently SFC is only +implemented with VXLAN-GPE + ETH + NSH. + +Workaround for VXLAN and OpenStack +---------------------------------- + +When using NSH with VXLAN tunnels, its important that the VXLAN tunnel is terminated +in the SF VM. This allows the SF to see the NSH header, allowing it to decrement the +NSI and also to use the NSH metadata. When using VXLAN with OpenStack, the tunnels +are not terminated in the SF VM, but in the “br-int” OVS bridge. A work-around has +been created to address this issue, which can be found here: + +http://artifacts.opnfv.org/sfc/brahmaputra/docs/design/architecture.html#ovs-nsh-patch-workaround + +In subsequent versions of SFC, we will change the SFF-SF transport to be ETH + NSH, +which will obviate this work around. + +References +========== + +For more information about SFC, please visit: + +https://wiki.opnfv.org/display/sfc/Service+Function+Chaining+Home + +https://wiki.opendaylight.org/view/Service_Function_Chaining:Main + +For more information on the OPNFV Colorado release, please visit: + +http://www.opnfv.org/colorado + |