From 8a300e0a93a2b2f49710fafb9959a9dc8ae2fff8 Mon Sep 17 00:00:00 2001 From: csatari Date: Thu, 23 Jun 2016 10:06:33 +0200 Subject: Georedundancy reorganization and enhancement to the introduction - Use case structure reorganized again - A new, georedundancy.rst has been created (as in L3VPN case) - Parent chapter (2.4) for all geuredundancy usecases added (as in L3VPN case) - Introduction moved to the parent chapter (2.4) - Learnings of the OPNFV Summit netready breakout added to the intro of the use cases Change-Id: I8260269f6a2b981e9a0f226e11bed5f3cecf8b3b Signed-off-by: csatari --- .../requirements/use_cases/georedundancy_cells.rst | 60 ++++------------------ 1 file changed, 10 insertions(+), 50 deletions(-) (limited to 'docs/requirements/use_cases/georedundancy_cells.rst') diff --git a/docs/requirements/use_cases/georedundancy_cells.rst b/docs/requirements/use_cases/georedundancy_cells.rst index 95ffc6f..34269dc 100644 --- a/docs/requirements/use_cases/georedundancy_cells.rst +++ b/docs/requirements/use_cases/georedundancy_cells.rst @@ -1,71 +1,31 @@ .. This work is licensed under a Creative Commons Attribution 4.0 International License. .. http://creativecommons.org/licenses/by/4.0 -Georedundancy: Connection between different OpenStack cells ------------------------------------------------------------ -Georedundancy refers to a configuration which ensures the service continuity of -the VNF-s even if a whole datacenter fails [Q: Do we include or exclude VNF -pooling?]. - -This can be achieved by redundant VNF-s in a hot (spare VNF is running its -configuration and internal state is synchronised to the active VNF), -warm (spare VNF is running, its configuration is synchronised to the active VNF) -or cold (spare VNF is not running, active VNF-s configuration is stored in a -database and dropped to the spare VNF during its activation) standby state in a -different datacenter from where the active VNF-s are running. -The synchronisation and data transfer can be handled by the application or the infrastructure. -In all of these georedundancy setups there is a need for a network connection -between the datacenter running the active VNF and the datacenter running the -spare VNF. - -In case of a distributed cloud it is possible that the georedundant cloud of an application -is not predefined or changed and the change requires configuration in the underlay networks. - -This set of georedundancy use cases is about enabling the possiblity to select a datacenter as -backup datacenter and build the connectivity between the NFVI-s in the -different datacenters in a programmable way. - -As an example the following picture (:numref:`georedundancy-before`) shows a -multicell cloud setup where the underlay network is not fully mashed. - -.. figure:: images/georedundancy-before.png - :name: georedundancy-before - :width: 25% - -Each datacenter (DC) is a separate OpenStack cell, region or instance. Let's -assume that a new VNF is started in DC b with a Redundant VNF in DC d. In this -case a direct underlay network connection is needed between DC b and DC d. The -configuration of this connection should be programable in both DC b and DC d. -The result of the deployment is shown in the following figure -(:numref:`georedundancy-after`): - -.. figure:: images/georedundancy-after.png - :name: georedundancy-after - :width: 25% - +Connection between different OpenStack cells +-------------------------------------------- Description ^^^^^^^^^^^ There should be an API to manage the infrastructure-s networks between two OpenStack cells. (Note: In the Mitaka release of OpenStack cells v1 are considered as, cells v2 functionaity is under implementation) +This capability exists in the different SDN controllers, like the Add New BGP +neighbour API of OpenDaylight. OpenStack Neutron should provide and abstracted +API for this functionality what later calls the given SDN controllers related +API. -- Maybe the existing capability of Neutron to have several subnets associated - to an external network is enough? - -Requirements -^^^^^^^^^^^^ +Derrived Requirements +^^^^^^^^^^^^^^^^^^^^^ - Possibility to define a remote and a local endpoint - As in case of cells the nova-api service is shared it should be possible to identify the cell in the API calls -Northbound API / Workflow -""""""""""""""""""""""""" +Northbound API +"""""""""""""" - An infrastructure network management API is needed - When the endpoints are created neutron is configured to use the new network. (Note: Nova networking is not considered as it is deprecated.) - Data model objects """""""""""""""""" - TBD -- cgit 1.2.3-korg