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Diffstat (limited to 'docs/requirements/use_cases/l3vpn_any_to_any.rst')
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1 files changed, 82 insertions, 36 deletions
diff --git a/docs/requirements/use_cases/l3vpn_any_to_any.rst b/docs/requirements/use_cases/l3vpn_any_to_any.rst index 5fc5712..028e565 100644 --- a/docs/requirements/use_cases/l3vpn_any_to_any.rst +++ b/docs/requirements/use_cases/l3vpn_any_to_any.rst @@ -2,29 +2,38 @@ .. http://creativecommons.org/licenses/by/4.0 .. (c) Bin Hu -Service Providers' virtualized network infrastructure may consist of one or more -SDN Controllers from different vendors. Those SDN Controllers may be managed -within one cloud or multiple clouds. Jointly, those VIMs (e.g. OpenStack instances) -and SDN Controllers work together in an interoperable framework to create L3 services -in Service Providers' virtualized network infrastructure. +L3VPNs are virtual layer 3 networks described in multiple standards and RFCs, +such as [RFC4364]_ and [RFC7432]_. Connectivity as well as traffic separation is +achieved by exchanging routes between VRFs (Virtual Routing and Forwarding). + +Moreover, a Service Providers' virtualized network infrastructure may consist of +one or more SDN Controllers from different vendors. Those SDN Controllers may be +managed within one cloud or multiple clouds. Jointly, those VIMs (e.g. OpenStack +instances) and SDN Controllers work together in an interoperable framework to +create L3 services in the Service Providers' virtualized network infrastructure. Three use cases of creating L3VPN service by multiple SDN Controllers are described as follows. + Any-to-Any Base Case -------------------- Description ~~~~~~~~~~~ +This any-to-any use case is the base scenario, providing layer 3 connectivity +between VNFs in the same L3VPN while separating the traffic and IP address +spaces of different L3VPNs belonging to different tenants. + There are 2 hosts (compute nodes). SDN Controller A and vRouter A are provided by Vendor A, and run on host A. SDN Controller B and vRouter B are provided by Vendor B, and run on host B. -There are 2 tenants. Tenant 1 creates L3VPN Blue with 2 subnets: 10.1.1.0/24 and 10.3.7.0/24. -Tenant 2 creates L3VPN Red with 1 subnet, overlapping address space: 10.1.1.0/24. - -The network topology is shown in :numref:`l3vpn-any2any-figure`: +There are 2 tenants. Tenant 1 creates L3VPN Blue with 2 subnets: 10.1.1.0/24 and +10.3.7.0/24. Tenant 2 creates L3VPN Red with 1 subnet and an overlapping +address space: 10.1.1.0/24. The network topology is shown in +:numref:`l3vpn-any2any-figure`. .. figure:: images/l3vpn-any2any.png :name: l3vpn-any2any-figure @@ -38,11 +47,6 @@ and assigned IP addresses respectively. In L3VPN Red, VM G5 (10.1.1.5) is spawned on host A, and attached to subnet 10.1.1.0/24. VM G6 (10.1.1.6) is spawned on host B, and attached to the same subnet 10.1.1.0/24. -VRF Lets us do: - -1. Overlapping Addresses - -2. Segregation of Traffic Derrived Requirements @@ -51,6 +55,8 @@ Derrived Requirements Northbound API / Workflow +++++++++++++++++++++++++ +[**Georg: this section needs to be made more readable**] + Exemplary workflow is described as follows: 1. Create Network @@ -95,50 +101,90 @@ Current implementation ~~~~~~~~~~~~~~~~~~~~~~ Support for creating and managing L3VPNs is available in OpenStack Neutron by -means of the BGPVPN project [BGPVPN]_. In order to create the L3VPN network -configuration described above using the API BGPVPN API, the following workflow +means of the [BGPVPN]_ project. In order to create the L3VPN network +configuration described above using the API [BGPVPN]_ API, the following workflow is needed: -1. Create a Neutron network "blue" +1. Create Neutron networks for tenant "Blue" - :code:`neutron net-create blue` + ``neutron net-create --tenant-id Blue net1`` + ``neutron net-create --tenant-id Blue net2`` -2. Create the first Neutron subnet of the network "blue" - :code:`neutron subnet-create <blue network UUID> 10.1.1.0/24` +2. Create subnets for the Neutron networks for tenant "Blue" + ``neutron subnet-create --tenant-id Blue --name subnet1 net1 10.1.1.0/24`` -3. Create the second Neutron subnet of the network "blue" + ``neutron subnet-create --tenant-id Blue --name subnet2 net2 10.3.7.0/24`` - :code:`neutron subnet-create <blue network UUID> 10.3.7.0/24` +3. Create Neutron ports in the corresponding networks for tenant "Blue" -4. Create a L3VPN by means of the BGPVPN API + ``neutron port-create --tenant-id Blue --name G1 --fixed-ip subnet_id=subnet1,ip_address=10.1.1.5 net1`` - :code:`neutron bgpvpn-create --route-targets 64512:1 --tenant-id <tenant-id> --name blue` + ``neutron port-create --tenant-id Blue --name G2 --fixed-ip subnet_id=subnet1,ip_address=10.1.1.6 net1`` + ``neutron port-create --tenant-id Blue --name G3 --fixed-ip subnet_id=subnet2,ip_address=10.3.7.9 net2`` -5. Associate the L3VPN with the previously created network + ``neutron port-create --tenant-id Blue --name G4 --fixed-ip subnet_id=subnet2,ip_address=10.3.7.10 net2`` - :code:`neutron bgpvpn-net-assoc-create blue --network <network-UUID>` - This command associates the given Neutron network with the L3VPN. The semantic - of this operation is that all subnets bound to the network are getting - interconnected through the BGP VPN and hence VMs located in either subnet can - communicate with each other. +4. Create Neutron network for tenant "Red" + ``neutron net-create --tenant-id Red net3`` -Gaps in the current solution -~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +5. Create subnet for the Neutron network of tenant "Red" + + ``neutron subnet-create --tenant-id Red --name subnet3 net3 10.1.1.0/24`` + + +6. Create Neutron ports in the networks of tenant "Red" + + ``neutron port-create --tenant-id Red --name G5 --fixed-ip subnet_id=subnet3,ip_address=10.1.1.5 net3`` + + ``neutron port-create --tenant-id Red --name G7 --fixed-ip subnet_id=subnet3,ip_address=10.1.1.6 net3`` + + +7. Create a L3VPN by means of the BGPVPN API for tenant "Blue" -TBD + ``neutron bgpvpn-create --tenant-id Blue --route-targets AS:100 --name vpn1`` -Conclusion -~~~~~~~~~~ +8. Associate the L3VPN of tenant "Blue" with the previously created networks -TBD + ``neutron bgpvpn-net-assoc-create --tenant-id Blue --network net1 --name vpn1`` + ``neutron bgpvpn-net-assoc-create --tenant-id Blue --network net2 --name vpn1`` + + +9. Create a L3VPN by means of the BGPVPN API for tenant "Red" + + ``neutron bgpvpn-create --tenant-id Red --route-targets AS:200 --name vpn2`` + + +10. Associate the L3VPN of tenant "Red" with the previously created networks + + ``neutron bgpvpn-net-assoc-create --tenant-id Red --network net3 --name vpn2`` + + +Comments: + +* In this configuration only one BGPVPN for each tenant is created. + +* The ports are associated indirectly to the VPN through their networks. + +* The BGPVPN backend takes care of distributing the /32 routes to the OVR instances + and assigning appropriate RD values. + + + +Gaps in the current solution +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +There are no gaps in the currently available solution which prevent realizing +this particular use case. +[**Georg: there are no gaps in terms of functionality provided by the BGPVPN +project. However, a better analysis of the multi-backend support in Neutron is +needed**] |