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This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) Bin Hu + +L3VPN Use Cases +=============== + +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. + +Three use cases of creating L3VPN service by multiple SDN Controllers are described +as follows. + +Any-to-Any Base Case +-------------------- + +Description +~~~~~~~~~~~ + +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`: + +.. figure:: images/l3vpn-any2any.png + :name: l3vpn-any2any-figure + :width: 100% + +In L3VPN Blue, VMs G1 (10.1.1.5) and G2 (10.3.7.9) are spawned on host A, and attached to 2 subnets +(10.1.1.0/24 and 10.3.7.0/24) and assigned IP addresses respectively. VMs G3 (10.1.1.6) and +G4 (10.3.7.10) are spawned on host B, and attached to 2 subnets (10.1.1.0/24 and 10.3.7.0/24) +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. + +Exemplary workflow is described as follows: + +1. Create Network +2. Create Network VRF Policy Resource ``Any-to-Any`` +2.1. This sets up that when this tenant is put on a HOST that: +2.1.1. There will be a RD assigned per VRF +2.1.2. There will be a RT used for the common any-to-any communication +3. Create Subnet +4. Create Port (subnet, network vrf policy resource). This causes controller to: +4.1. Create vrf in vRouter's FIB, or Update vrf if already exists +4.2. Install an entry for Guest's HOST-Route in FIBs of Vrouters serving this tenant Virtual Network +4.3. Announce Guest HOST-Route to WAN-GW via MP-BGP + +VRF Lets us do: +1. Overlapping Addresses +2. Segregation of Traffic + +Derrived Requirements +~~~~~~~~~~~~~~~~~~~~~ + - TBD + +Northbound API / Workflow ++++++++++++++++++++++++++ + - TBD + +Data model objects +++++++++++++++++++ + - TBD + +Orchestration ++++++++++++++ + - TBD + +Dependencies on compute services +++++++++++++++++++++++++++++++++ + - TBD + +Potential implementation +++++++++++++++++++++++++ + - TBD + + +ECMP Load Splitting Case (Anycast) +---------------------------------- + +Description +~~~~~~~~~~~ + +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 is 1 tenant. Tenant 1 creates L3VPN Blue with subnet 10.1.1.0/24. + +The network topology is shown in :numref:`l3vpn-ecmp-figure`: + +.. figure:: images/l3vpn-ecmp.png + :name: l3vpn-ecmp-figure + :width: 100% + +In L3VPN Blue, VNF1.1 and VNF1.2 are spawned on host A, attached to subnet 10.1.1.0/24 +and assigned the same IP address 10.1.1.5. VNF1.3 is spawned on host B, attached to +subnet 10.1.1.0/24 and assigned the same IP addresses 10.1.1.5. VNF 2 and VNF 3 are spawned +on host A and B respectively, attached to subnet 10.1.1.0/24, and assigned different IP +addresses 10.1.1.6 and 10.1.1.3 respectively. + +Here, the Network VRF Policy Resource is ``ECMP/AnyCast``. Traffic to **Anycast 10.1.1.5** +can be load split from either WAN GW or another VM like G5. + + +Derrived Requirements +~~~~~~~~~~~~~~~~~~~~~ + - TBD + +Northbound API / Workflow ++++++++++++++++++++++++++ + - TBD + +Data model objects +++++++++++++++++++ + - TBD + +Orchestration ++++++++++++++ + - TBD + +Dependencies on compute services +++++++++++++++++++++++++++++++++ + - TBD + +Potential implementation +++++++++++++++++++++++++ + - TBD + + +Hub and Spoke Case +------------------ + +Description +~~~~~~~~~~~ + +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 is 1 tenant. Tenant 1 creates L3VPN Blue with 2 subnets: 10.1.1.0/24 and 10.3.7.0/24. + +The network topology is shown in :numref:`l3vpn-hub-spoke-figure`: + +.. figure:: images/l3vpn-hub-spoke.png + :name: l3vpn-hub-spoke-figure + :width: 100% + +In L3VPN Blue, vFW(H) is acting the role of ``hub`` (a virtual firewall). +The other 3 VNFsVMs are ``spoke``. vFW(H) and VNF1(S) are spawned on host A, +and VNF2(S) and VNF3(S) are spawned on host B. vFW(H) (10.1.1.5) and VNF2(S) +(10.1.1.6) are attached to subnet 10.1.1.0/24. VNF1(S) (10.3.7.9) and VNF3(S) +(10.3.7.10) are attached to subnet 10.3.7.0/24. + +Exemplary vFW(H) Hub VRF is as follows: + +* RD1 10.1.1.5 IP_OVR1 Label1 +* RD1 0/0 IP_OVR1 Label1 +* Label 1 Local IF (10.1.1.5) +* RD3 10.3.7.9 IP_OVR1 Label2 +* RD2 10.1.1.6 IP_OVR2 Label3 +* RD4 10.3.7.10 IP_OVR2 Label3 + +Exemplary VNF1(S) Spoke VRF is as follows: + +* RD1 0/0 IP_OVR1 Label1 +* RD3 10.3.7.9 IP_OVR1 Label2 + +Exemplary workflow is described as follows: + +1. Create Network +2. Create VRF Policy Resource +2.1. Hub and Spoke +3. Create Subnet +4. Create Port +4.1. Subnet +4.2. VRF Policy Resource, [H | S] + + +Derrived Requirements +~~~~~~~~~~~~~~~~~~~~~ + - TBD + +Northbound API / Workflow ++++++++++++++++++++++++++ + - TBD + +Data model objects +++++++++++++++++++ + - TBD + +Orchestration ++++++++++++++ + - TBD + +Dependencies on compute services +++++++++++++++++++++++++++++++++ + - TBD + +Potential implementation +++++++++++++++++++++++++ + - TBD + + |
