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authorBin Hu <bh526r@att.com>2016-07-22 15:52:43 -0700
committerBin Hu <bh526r@att.com>2016-07-22 15:53:56 -0700
commite5221f56ba631f8774ac50b2cb316178b9b2cf1a (patch)
tree62eb15c0fce68d786fe93b88c742d211fbea82a5 /docs/userguide/featureusage.rst
parentc519c9bdda8acee4f5cdf4ad5d12d6401e435489 (diff)
Gap analysis of IPv6 in Mitaka and Boron
Change-Id: Ib5f439d0f74d852ab8b4b04a8fafd9b489753983 Signed-off-by: Bin Hu <bh526r@att.com>
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.. http://creativecommons.org/licenses/by/4.0
.. (c) Bin Hu (AT&T) and Sridhar Gaddam (RedHat)
-=========================================
-Using IPv6 Feature of Brahmaputra Release
-=========================================
+======================================
+Using IPv6 Feature of Colorado Release
+======================================
This section provides the users with gap analysis regarding IPv6 feature requirements with
-OpenStack Liberty Official Release and Open Daylight Beryllium Official Release. The gap analysis
+OpenStack Mitaka Official Release and Open Daylight Boron Official Release. The gap analysis
serves as feature specific user guides and references when as a user you may leverage the
IPv6 feature in the platform and need to perform some IPv6 related operations.
-****************************************
-IPv6 Gap Analysis with OpenStack Liberty
-****************************************
+***************************************
+IPv6 Gap Analysis with OpenStack Mitaka
+***************************************
This section provides users with IPv6 gap analysis regarding feature requirement with
-OpenStack Neutron in Liberty Official Release. The following table lists the use cases / feature
+OpenStack Neutron in Mitaka Official Release. The following table lists the use cases / feature
requirements of VIM-agnostic IPv6 functionality, including infrastructure layer and VNF
-(VM) layer, and its gap analysis with OpenStack Neutron in Liberty Official Release.
+(VM) layer, and its gap analysis with OpenStack Neutron in Mitaka Official Release.
.. table::
:class: longtable
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Use Case / Requirement |Supported in Liberty |Notes |
- +===========================================================+=========================+====================================================================+
- |All topologies work in a multi-tenant environment |Yes |The IPv6 design is following the Neutron tenant networks model; |
- | | |dnsmasq is being used inside DHCP network namespaces, while radvd |
- | | |is being used inside Neutron routers namespaces to provide full |
- | | |isolation between tenants. Tenant isolation can be based on VLANs, |
- | | |GRE, or VXLAN encapsulation. In case of overlays, the transport |
- | | |network (and VTEPs) must be IPv4 based as of today. |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |IPv6 VM to VM only |Yes |It is possible to assign IPv6-only addresses to VMs. Both switching |
- | | |(within VMs on the same tenant network) as well as east/west routing|
- | | |(between different networks of the same tenant) are supported. |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |IPv6 external L2 VLAN directly attached to a VM |Yes |IPv6 provider network model; RA messages from upstream (external) |
- | | |router are forwarded into the VMs |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |IPv6 subnet routed via L3 agent to an external IPv6 network| |Configuration is enhanced since Kilo to allow easier setup of the |
- | |1. Yes |upstream gateway, without the user being forced to create an IPv6 |
- |1. Both VLAN and overlay (e.g. GRE, VXLAN) subnet attached | |subnet for the external network. |
- | to VMs; | | |
- |2. Must be able to support multiple L3 agents for a given |2. Yes | |
- | external network to support scaling (neutron scheduler | | |
- | to assign vRouters to the L3 agents) | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Ability for a NIC to support both IPv4 and IPv6 (dual | |Dual-stack is supported in Neutron with the addition of |
- |stack) address. | |``Multiple IPv6 Prefixes`` Blueprint |
- | | | |
- |1. VM with a single interface associated with a network, |1. Yes | |
- | which is then associated with two subnets. | | |
- |2. VM with two different interfaces associated with two |2. Yes | |
- | different networks and two different subnets. | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Support IPv6 Address assignment modes. |1. Yes | |
- | | | |
- |1. SLAAC |2. Yes | |
- |2. DHCPv6 Stateless | | |
- |3. DHCPv6 Stateful |3. Yes | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Ability to create a port on an IPv6 DHCPv6 Stateful subnet |Yes | |
- |and assign a specific IPv6 address to the port and have it | | |
- |taken out of the DHCP address pool. | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Ability to create a port with fixed_ip for a |**No** |The following patch disables this operation: |
- |SLAAC/DHCPv6-Stateless Subnet. | |https://review.openstack.org/#/c/129144/ |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Support for private IPv6 to external IPv6 floating IP; |**Rejected** |Blueprint proposed in upstream and got rejected. General expectation|
- |Ability to specify floating IPs via Neutron API (REST and | |is to avoid NAT with IPv6 by assigning GUA to tenant VMs. See |
- |CLI) as well as via Horizon, including combination of | |https://review.openstack.org/#/c/139731/ for discussion. |
- |IPv6/IPv4 and IPv4/IPv6 floating IPs if implemented. | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Provide IPv6/IPv4 feature parity in support for |**To-Do** |The L3 configuration should be transparent for the SR-IOV |
- |pass-through capabilities (e.g., SR-IOV). | |implementation. SR-IOV networking support introduced in Juno based |
- | | |on the ``sriovnicswitch`` ML2 driver is expected to work with IPv4 |
- | | |and IPv6 enabled VMs. We need to verify if it works or not. |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Additional IPv6 extensions, for example: IPSEC, IPv6 |**No** |It does not appear to be considered yet (lack of clear requirements)|
- |Anycast, Multicast | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |VM access to the meta-data server to obtain user data, SSH |**No** |This is currently not supported. Config-drive or dual-stack IPv4 / |
- |keys, etc. using cloud-init with IPv6 only interfaces. | |IPv6 can be used as a workaround (so that the IPv4 network is used |
- | | |to obtain connectivity with the metadata service) |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Full support for IPv6 matching (i.e., IPv6, ICMPv6, TCP, |Yes | |
- |UDP) in security groups. Ability to control and manage all | | |
- |IPv6 security group capabilities via Neutron/Nova API (REST| | |
- |and CLI) as well as via Horizon. | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |During network/subnet/router create, there should be an |Yes |Two new Subnet attributes were introduced to control IPv6 address |
- |option to allow user to specify the type of address | |assignment options: |
- |management they would like. This includes all options | | |
- |including those low priority if implemented (e.g., toggle | |* ``ipv6-ra-mode``: to determine who sends Router Advertisements; |
- |on/off router and address prefix advertisements); It must | | |
- |be supported via Neutron API (REST and CLI) as well as via | |* ``ipv6-address-mode``: to determine how VM obtains IPv6 address, |
- |Horizon | | default gateway, and/or optional information. |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Security groups anti-spoofing: Prevent VM from using a |Yes | |
- |source IPv6/MAC address which is not assigned to the VM | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Protect tenant and provider network from rogue RAs |Yes |When using a tenant network, Neutron is going to automatically |
- | | |handle the filter rules to allow connectivity of RAs to the VMs only|
- | | |from the Neutron router port; with provider networks, users are |
- | | |required to specify the LLA of the upstream router during the subnet|
- | | |creation, or otherwise manually edit the security-groups rules to |
- | | |allow incoming traffic from this specific address. |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Support the ability to assign multiple IPv6 addresses to |Yes | |
- |an interface; both for Neutron router interfaces and VM | | |
- |interfaces. | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Ability for a VM to support a mix of multiple IPv4 and IPv6|Yes | |
- |networks, including multiples of the same type. | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Support for IPv6 Prefix Delegation. |Yes |Partial support in Liberty |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |Distributed Virtual Routing (DVR) support for IPv6 |**No** |Blueprint proposed upstream, pending discussion. |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |IPv6 First-Hop Security, IPv6 ND spoofing |Yes | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
- |IPv6 support in Neutron Layer3 High Availability |Yes | |
- |(keepalived+VRRP). | | |
- +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Use Case / Requirement |Supported in Mitaka|Notes |
+ +===========================================================+===================+====================================================================+
+ |All topologies work in a multi-tenant environment |Yes |The IPv6 design is following the Neutron tenant networks model; |
+ | | |dnsmasq is being used inside DHCP network namespaces, while radvd |
+ | | |is being used inside Neutron routers namespaces to provide full |
+ | | |isolation between tenants. Tenant isolation can be based on VLANs, |
+ | | |GRE, or VXLAN encapsulation. In case of overlays, the transport |
+ | | |network (and VTEPs) must be IPv4 based as of today. |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |IPv6 VM to VM only |Yes |It is possible to assign IPv6-only addresses to VMs. Both switching |
+ | | |(within VMs on the same tenant network) as well as east/west routing|
+ | | |(between different networks of the same tenant) are supported. |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |IPv6 external L2 VLAN directly attached to a VM |Yes |IPv6 provider network model; RA messages from upstream (external) |
+ | | |router are forwarded into the VMs |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |IPv6 subnet routed via L3 agent to an external IPv6 network| |Configuration is enhanced since Kilo to allow easier setup of the |
+ | |1. Yes |upstream gateway, without the user being forced to create an IPv6 |
+ |1. Both VLAN and overlay (e.g. GRE, VXLAN) subnet attached | |subnet for the external network. |
+ | to VMs; | | |
+ |2. Must be able to support multiple L3 agents for a given |2. Yes | |
+ | external network to support scaling (neutron scheduler | | |
+ | to assign vRouters to the L3 agents) | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Ability for a NIC to support both IPv4 and IPv6 (dual | |Dual-stack is supported in Neutron with the addition of |
+ |stack) address. | |``Multiple IPv6 Prefixes`` Blueprint |
+ | | | |
+ |1. VM with a single interface associated with a network, |1. Yes | |
+ | which is then associated with two subnets. | | |
+ |2. VM with two different interfaces associated with two |2. Yes | |
+ | different networks and two different subnets. | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Support IPv6 Address assignment modes. |1. Yes | |
+ | | | |
+ |1. SLAAC |2. Yes | |
+ |2. DHCPv6 Stateless | | |
+ |3. DHCPv6 Stateful |3. Yes | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Ability to create a port on an IPv6 DHCPv6 Stateful subnet |Yes | |
+ |and assign a specific IPv6 address to the port and have it | | |
+ |taken out of the DHCP address pool. | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Ability to create a port with fixed_ip for a |**No** |The following patch disables this operation: |
+ |SLAAC/DHCPv6-Stateless Subnet. | |https://review.openstack.org/#/c/129144/ |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Support for private IPv6 to external IPv6 floating IP; |**Rejected** |Blueprint proposed in upstream and got rejected. General expectation|
+ |Ability to specify floating IPs via Neutron API (REST and | |is to avoid NAT with IPv6 by assigning GUA to tenant VMs. See |
+ |CLI) as well as via Horizon, including combination of | |https://review.openstack.org/#/c/139731/ for discussion. |
+ |IPv6/IPv4 and IPv4/IPv6 floating IPs if implemented. | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Provide IPv6/IPv4 feature parity in support for |**To-Do** |The L3 configuration should be transparent for the SR-IOV |
+ |pass-through capabilities (e.g., SR-IOV). | |implementation. SR-IOV networking support introduced in Juno based |
+ | | |on the ``sriovnicswitch`` ML2 driver is expected to work with IPv4 |
+ | | |and IPv6 enabled VMs. We need to verify if it works or not. |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Additional IPv6 extensions, for example: IPSEC, IPv6 |**No** |It does not appear to be considered yet (lack of clear requirements)|
+ |Anycast, Multicast | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |VM access to the meta-data server to obtain user data, SSH |**No** |This is currently not supported. Config-drive or dual-stack IPv4 / |
+ |keys, etc. using cloud-init with IPv6 only interfaces. | |IPv6 can be used as a workaround (so that the IPv4 network is used |
+ | | |to obtain connectivity with the metadata service) |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Full support for IPv6 matching (i.e., IPv6, ICMPv6, TCP, |Yes | |
+ |UDP) in security groups. Ability to control and manage all | | |
+ |IPv6 security group capabilities via Neutron/Nova API (REST| | |
+ |and CLI) as well as via Horizon. | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |During network/subnet/router create, there should be an |Yes |Two new Subnet attributes were introduced to control IPv6 address |
+ |option to allow user to specify the type of address | |assignment options: |
+ |management they would like. This includes all options | | |
+ |including those low priority if implemented (e.g., toggle | |* ``ipv6-ra-mode``: to determine who sends Router Advertisements; |
+ |on/off router and address prefix advertisements); It must | | |
+ |be supported via Neutron API (REST and CLI) as well as via | |* ``ipv6-address-mode``: to determine how VM obtains IPv6 address, |
+ |Horizon | | default gateway, and/or optional information. |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Security groups anti-spoofing: Prevent VM from using a |Yes | |
+ |source IPv6/MAC address which is not assigned to the VM | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Protect tenant and provider network from rogue RAs |Yes |When using a tenant network, Neutron is going to automatically |
+ | | |handle the filter rules to allow connectivity of RAs to the VMs only|
+ | | |from the Neutron router port; with provider networks, users are |
+ | | |required to specify the LLA of the upstream router during the subnet|
+ | | |creation, or otherwise manually edit the security-groups rules to |
+ | | |allow incoming traffic from this specific address. |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Support the ability to assign multiple IPv6 addresses to |Yes | |
+ |an interface; both for Neutron router interfaces and VM | | |
+ |interfaces. | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Ability for a VM to support a mix of multiple IPv4 and IPv6|Yes | |
+ |networks, including multiples of the same type. | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Support for IPv6 Prefix Delegation. |Yes |Partial support in Mitaka |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |Distributed Virtual Routing (DVR) support for IPv6 |**No** |Blueprint proposed upstream, pending discussion. |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |IPv6 First-Hop Security, IPv6 ND spoofing |Yes | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
+ |IPv6 support in Neutron Layer3 High Availability |Yes | |
+ |(keepalived+VRRP). | | |
+ +-----------------------------------------------------------+-------------------+--------------------------------------------------------------------+
-**********************************************
-IPv6 Gap Analysis with Open Daylight Beryllium
-**********************************************
+******************************************
+IPv6 Gap Analysis with Open Daylight Boron
+******************************************
This section provides users with IPv6 gap analysis regarding feature requirement with
-Open Daylight Beryllium Official Release. The following table lists the use cases / feature
+Open Daylight Boron Official Release. The following table lists the use cases / feature
requirements of VIM-agnostic IPv6 functionality, including infrastructure layer and VNF
-(VM) layer, and its gap analysis with Open Daylight Beryllium Official Release.
+(VM) layer, and its gap analysis with Open Daylight Boron Official Release.
.. table::
:class: longtable
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |Use Case / Requirement |Supported in ODL Beryllium|Notes |
- +=============================================================+==========================+==========================================================================+
- |REST API support for IPv6 subnet creation in ODL |Yes |Yes, it is possible to create IPv6 subnets in ODL using Neutron REST API. |
- | | | |
- | | |For a network which has both IPv4 and IPv6 subnets, ODL mechanism driver |
- | | |will send the port information which includes IPv4/v6 addresses to ODL |
- | | |Neutron northbound API. When port information is queried it displays IPv4 |
- | | |and IPv6 addresses. However, in Beryllium release, ODL net-virt provider |
- | | |does not support IPv6 features (i.e., the actual functionality is missing |
- | | |and would be available only in the later releases of ODL). |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |IPv6 Router support in ODL |**No** |ODL net-virt provider in Beryllium release only supports IPv4 Router. |
- | | | |
- |1. Communication between VMs on same compute node | |In the meantime, if IPv6 Routing is necessary, we can use ODL for L2 |
- |2. Communication between VMs on different compute nodes | |connectivity and Neutron L3 agent for IPv4/v6 routing. |
- | (east-west) | | |
- |3. External routing (north-south) | | |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |IPAM: Support for IPv6 Address assignment modes. |**No** |Although it is possible to create different types of IPv6 subnets in ODL, |
- | | |ODL_L3 would have to implement the IPv6 Router that can send out Router |
- |1. SLAAC | |Advertisements based on the IPv6 addressing mode. Router Advertisement |
- |2. DHCPv6 Stateless | |is also necessary for VMs to configure the default route. |
- |3. DHCPv6 Stateful | | |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |When using ODL for L2 forwarding/tunneling, it is compatible |Yes | |
- |with IPv6. | | |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |Full support for IPv6 matching (i.e., IPv6, ICMPv6, TCP, UDP)|**No** |Security Groups for IPv6 is a work in progress. |
- |in security groups. Ability to control and manage all IPv6 | | |
- |security group capabilities via Neutron/Nova API (REST and | | |
- |CLI) as well as via Horizon. | | |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |Shared Networks support |**No** |ODL currently assumes a single tenant to network mapping and does not |
- | | |support shared networks among tenants. |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |IPv6 external L2 VLAN directly attached to a VM. |**ToDo** | |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
- |ODL on an IPv6 only Infrastructure. |**ToDo** |Deploying OpenStack with ODL on an IPv6 only infrastructure where the API |
- | | |endpoints are all IPv6 addresses. |
- +-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |Use Case / Requirement |Supported in ODL Boron|Notes |
+ +=============================================================+======================+==========================================================================+
+ |REST API support for IPv6 subnet creation in ODL |Yes |Yes, it is possible to create IPv6 subnets in ODL using Neutron REST API. |
+ | | | |
+ | | |For a network which has both IPv4 and IPv6 subnets, ODL mechanism driver |
+ | | |will send the port information which includes IPv4/v6 addresses to ODL |
+ | | |Neutron northbound API. When port information is queried it displays IPv4 |
+ | | |and IPv6 addresses. However, in Boron release, ODL net-virt provider |
+ | | |does not support IPv6 features (i.e., the actual functionality is missing |
+ | | |and would be available only in the later releases of ODL). |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |IPv6 Router support in ODL |**No** |ODL net-virt provider in Boron release only supports IPv4 Router. |
+ | | | |
+ |1. Communication between VMs on same compute node | |In the meantime, if IPv6 Routing is necessary, we can use ODL for L2 |
+ |2. Communication between VMs on different compute nodes | |connectivity and Neutron L3 agent for IPv4/v6 routing. |
+ | (east-west) | | |
+ |3. External routing (north-south) | | |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |IPAM: Support for IPv6 Address assignment modes. |**No** |Although it is possible to create different types of IPv6 subnets in ODL, |
+ | | |ODL_L3 would have to implement the IPv6 Router that can send out Router |
+ |1. SLAAC | |Advertisements based on the IPv6 addressing mode. Router Advertisement |
+ |2. DHCPv6 Stateless | |is also necessary for VMs to configure the default route. |
+ |3. DHCPv6 Stateful | | |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |When using ODL for L2 forwarding/tunneling, it is compatible |Yes | |
+ |with IPv6. | | |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |Full support for IPv6 matching (i.e., IPv6, ICMPv6, TCP, UDP)|**No** |Security Groups for IPv6 is a work in progress. |
+ |in security groups. Ability to control and manage all IPv6 | | |
+ |security group capabilities via Neutron/Nova API (REST and | | |
+ |CLI) as well as via Horizon. | | |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |Shared Networks support |Yes | |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |IPv6 external L2 VLAN directly attached to a VM. |**ToDo** | |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+
+ |ODL on an IPv6 only Infrastructure. |**ToDo** |Deploying OpenStack with ODL on an IPv6 only infrastructure where the API |
+ | | |endpoints are all IPv6 addresses. |
+ +-------------------------------------------------------------+----------------------+--------------------------------------------------------------------------+