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[docs] L3 router support ndp proxy 

Change-Id: I2b8642b6830d3e1e1ef86c779c55e9ac1d0f7568
Partial-Bug: #1877301
This commit is contained in:
yangjianfeng 2021-12-19 05:55:35 +00:00
parent 430abde13e
commit ad3171c538
6 changed files with 334 additions and 0 deletions
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3
bindep.txt
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@ -28,3 +28,6 @@ haproxy
keepalived
iproute-tc [platform:rpm]
# Provide ndsend command, used to send IPv6 Neighbor Discovery packets
vzctl [platform:dpkg]

2
doc/source/admin/config-bgp-dynamic-routing.rst
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@ -823,6 +823,8 @@ assist with verifying operation of the BGP speaker.
| 87cf2970-4970-462e-939e-00e802281dfa | | fa:16:3e:6b:18:e0 | ip_address='203.0.113.14', subnet_id='8ed65d41-2b2a-4f3a-9f92-45adb266e01a' |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------------------------+
.. _config-bgp-dynamic-routing-for-ipv6:
IPv6
~~~~

2
doc/source/admin/config-ipv6.rst
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@ -485,6 +485,8 @@ endpoints can be accessed via an IPv6 network. At this time, Open vSwitch
(OVS) tunnel types - STT, VXLAN, GRE, support both IPv4 and IPv6 endpoints.
.. _prefix-delegation:
Prefix delegation
~~~~~~~~~~~~~~~~~

320
doc/source/admin/config-ndp-proxy.rst Normal file
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@ -0,0 +1,320 @@
.. _config-ndp-proxy:
=========
NDP proxy
=========
If NDP proxy is set on a router, it is used to publish IPv6 addresses to
external routers. Its purpose is similar to floating IP, but it forwards the
traffic directly by using route rules and has no NAT action. Read the related
`specification <https://specs.openstack.org/openstack/neutron-specs/specs/xena/l3-router-support-ndp-proxy.html>`_
for more details.
Configuration of NDP proxy
~~~~~~~~~~~~~~~~~~~~~~~~~~
To configure NDP proxy, take the following steps:
* On the controller nodes:
Add the ``ndp_proxy`` service to the ``service_plugins`` setting in
``/etc/neutron/neutron.conf``. For example:
.. code-block:: none
service_plugins = router,ndp_proxy
.. note::
The ``router`` service plug-in has to be configured along with the
``ndp_proxy`` service plug-in
* On the network nodes or the compute nodes (for the dvr mode router):
Set the ``extensions`` option in the ``[agent]`` section of
``/etc/neutron/l3_agent.ini`` to include ``ndp_proxy``. This has to be
done in each network and compute node where the L3 agent is running. For
example:
.. code-block:: none
extensions = ndp_proxy
.. note::
After updating the options in the configuration files, the neutron-server
and every neutron-l3-agent need to be restarted for the new values to take
effect.
After configuring ndp proxy, the ``ndp-proxy`` extension alias will be
included in the output of the following command:
For api extension:
.. code-block:: console
$ openstack extension list --network
For agent extension:
.. code-block:: console
$ openstack network agent show <l3-agent-id>
.. note::
We Introduced a new command ``ndsend`` for NDP proxy feature, the command can
send Neighbor Advertisement about IPv6 to upstream router. With this command,
we can make the upstream router rapidly perceive the change of internal IPv6
address (such as, port migrated to other node). Read the
`manual page <http://manpages.ubuntu.com/manpages/focal/man8/ndsend.8.html>`_
for more details about this command.
Currently, you need install this command manually in every l3 agent node. For
ubuntu, the command provided by ``vzctl`` pkg, the install command:
``sudo apt install vzctl``.
* On the upstream router (The datacenter's physical router):
Generally, the admin operator should plan one or more IPv6 subnetpools to use
when NDP proxy is enabled, so that all internal subnets can be allocated from
a single, integrated subnetpool. In order to make NDP proxy work correctly,
the admin operator needs to set direct routes for these subnetpools.
Such as, we have a IPv6 subnetpool, it's CIDR is 2001::/96. The direct route
like below should be set:
.. code-block:: none
2001::/96 dev <ext-gw>
The ``ext-gw`` is the gateway interface of the cloud's external network.
User workflow
~~~~~~~~~~~~~
Assume the admin operator already prepared an IPv6 subnetpool:
``test-subnetpool``, its CIDR is 2001::/96.
At a high level, the basic steps to publish an IPv6 address to external
network (such as: public network) are the following:
1、Create a router and enable its external gateway
2、Set the router's ``enable_ndp_proxy`` parameter to True
3、Create a internal network and create a IPv6 subnet on it
4、Add the subnet to the router
5、Launch an instance on the network
6、Create a ndp proxy for the instance's port
* Create a router:
.. code-block:: console
$ openstack router create test-router
+-------------------------+--------------------------------------+
| Field | Value |
+-------------------------+--------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2022-01-01T06:50:44Z |
| description | |
| distributed | False |
| enable_ndp_proxy | False |
| external_gateway_info | null |
| flavor_id | None |
| ha | False |
| id | 3aab8554-e5c4-4262-ab95-b92857c641de |
| name | test-router |
| project_id | bcb0c7a5338b4a46959e47971c58f0f1 |
| revision_number | 1 |
| routes | |
| status | ACTIVE |
| tags | |
| updated_at | 2022-01-01T06:50:44Z |
+-------------------------+--------------------------------------+
* Set external gateway for the router:
.. code-block:: console
$ openstack router set test-router --external-gateway public
.. note::
If the external network has no IPv6 subnet and the ``ipv6_gateway`` is
configured on the ``neutron-l3-agent``, you may want to set
``use_lla_address`` to True at ``/etc/neutron/neutron.conf``, otherwise
The following command will raise a 403 error.
* Enable ndp proxy support on the router:
.. code-block:: console
$ openstack router set test-router --enable-ndp-proxy
.. warning::
If you are using another method (such as:
:ref:`BGP <config-bgp-dynamic-routing-for-ipv6>`,
:ref:`prefix-delegation` etc.) to publish the internal IPv6 address, the
command will break dataplane traffic.
* Create internal network and IPv6 subnet and add the subnet to above router:
.. code-block:: console
$ openstack network create int-net
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2022-01-01T07:11:08Z |
| description | |
| dns_domain | None |
| id | e527b38e-9e2a-439b-adf8-4ee1aa4f03b1 |
| ipv4_address_scope | None |
| ipv6_address_scope | None |
| is_default | False |
| is_vlan_transparent | None |
| mtu | 1450 |
| name | int-net |
| port_security_enabled | True |
| project_id | bcb0c7a5338b4a46959e47971c58f0f1 |
| provider:network_type | vxlan |
| provider:physical_network | None |
| provider:segmentation_id | 575 |
| qos_policy_id | None |
| revision_number | 1 |
| router:external | Internal |
| segments | None |
| shared | False |
| status | ACTIVE |
| subnets | |
| tags | |
| updated_at | 2022-01-01T07:11:08Z |
+---------------------------+--------------------------------------+
$ openstack subnet create --network int-net --subnet-pool test-subnetpool \
--prefix-length 112 --ip-version 6 \
--ipv6-ra-mode dhcpv6-stateful \
--ipv6-address-mode dhcpv6-stateful int-sub
+----------------------+--------------------------------------+
| Field | Value |
+----------------------+--------------------------------------+
| allocation_pools | 2001::2-2001::ffff |
| cidr | 2001::/112 |
| created_at | 2022-01-02T08:20:26Z |
| description | |
| dns_nameservers | |
| dns_publish_fixed_ip | None |
| enable_dhcp | True |
| gateway_ip | 2001::1 |
| host_routes | |
| id | 9bcf194c-d44f-4e6f-90da-98510ddef283 |
| ip_version | 6 |
| ipv6_address_mode | dhcpv6-stateful |
| ipv6_ra_mode | dhcpv6-stateful |
| name | int-sub |
| network_id | e527b38e-9e2a-439b-adf8-4ee1aa4f03b1 |
| project_id | bcb0c7a5338b4a46959e47971c58f0f1 |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | 73c5311c-6750-43f5-9a69-b50c1c5694fd |
| tags | |
| updated_at | 2022-01-02T08:20:26Z |
+----------------------+--------------------------------------+
$ openstack router add subnet test-router int-sub
* Launch an instance:
.. code-block:: console
$ openstack server create --flavor m1.tiny --image cirros-0.5.2-x86_64-disk --network int-net test-server
+-------------------------------------+-----------------------------------------------------------------+
| Field | Value |
+-------------------------------------+-----------------------------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | |
| OS-EXT-SRV-ATTR:host | None |
| OS-EXT-SRV-ATTR:hypervisor_hostname | None |
| OS-EXT-SRV-ATTR:instance_name | |
| OS-EXT-STS:power_state | NOSTATE |
| OS-EXT-STS:task_state | scheduling |
| OS-EXT-STS:vm_state | building |
| OS-SRV-USG:launched_at | None |
| OS-SRV-USG:terminated_at | None |
| accessIPv4 | |
| accessIPv6 | |
| addresses | |
| adminPass | 97UvRLgdFozR |
| config_drive | |
| created | 2022-01-02T08:22:35Z |
| flavor | m1.tiny (1) |
| hostId | |
| id | 189a104c-36cd-479a-8702-8111eb34fdb6 |
| image | cirros-0.5.2-x86_64-disk (2b2d2975-7ffc-463b-8c0e-993122f38b77) |
| key_name | None |
| name | test-server |
| progress | 0 |
| project_id | bcb0c7a5338b4a46959e47971c58f0f1 |
| properties | |
| security_groups | name='default' |
| status | BUILD |
| updated | 2022-01-02T08:22:34Z |
| user_id | 27e0947bb4fe47e4981da31d4a18ddf7 |
| volumes_attached | |
+-------------------------------------+-----------------------------------------------------------------+
* Create ndp proxy for the instance's port:
Query the port of the instance
.. code-block:: console
$ openstack port list --server test-server
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------+--------+
| ID | Name | MAC Address | Fixed IP Addresses | Status |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------+--------+
| bdd64aa0-437a-4db6-bbca-99869426c908 | | fa:16:3e:ac:15:b8 | ip_address='2001::284', subnet_id='9bcf194c-d44f-4e6f-90da-98510ddef283' | ACTIVE |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------+--------+
Create ndp proxy for the port
.. code-block:: console
$ openstack network ndp proxy create --router test-router --port bdd64aa0-437a-4db6-bbca-99869426c908 test-np
+-----------------+--------------------------------------+
| Field | Value |
+-----------------+--------------------------------------+
| created_at | 2022-01-02T08:25:31Z |
| description | |
| id | 73889fee-e322-443f-941e-142e4fc5f898 |
| ip_address | 2001::284 |
| name | test-np |
| port_id | bdd64aa0-437a-4db6-bbca-99869426c908 |
| project_id | bcb0c7a5338b4a46959e47971c58f0f1 |
| revision_number | 0 |
| router_id | 3aab8554-e5c4-4262-ab95-b92857c641de |
| updated_at | 2022-01-02T08:25:31Z |
+-----------------+--------------------------------------+
* Then ping the port's address from upstream router
.. code-block:: console
$ ping 2001::284
PING 2001::284(2001::284) 56 data bytes
64 bytes from 2001::284: icmp_seq=1 ttl=64 time=0.365 ms
64 bytes from 2001::284: icmp_seq=2 ttl=64 time=0.385 ms
Known limitations
~~~~~~~~~~~~~~~~~
* OVN backend is not supported

1
doc/source/admin/config.rst
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@ -24,6 +24,7 @@ Configuration
config-logging
config-macvtap
config-mtu
config-ndp-proxy
config-network-segment-ranges
config-ovs-dpdk
config-ovs-offload

6
releasenotes/notes/l3-ndp-proxy-397de144813f9396.yaml Normal file
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@ -0,0 +1,6 @@
---
features:
- |
Support for IPv6 NDP proxy has been added. Read the related
`specification <https://specs.openstack.org/openstack/neutron-specs/specs/xena/l3-router-support-ndp-proxy.html>`_
for more details.