Doc for how to use segment in newL3 netwoking model
More details in the spec for l3 networking https://review.openstack.org/#/c/530904/ Change-Id: I370cf6aa1f4932532e7b54d8a6189e2fda0f6954
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================================================================
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How to use the new layer-3 networking model for multi-NS-with-EW
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================================================================
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The following figure illustrates the new layer-3 networking model for multi-NS-with-EW::
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ext-net1 ext-net2
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+---+---+ +---+---+
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| |
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+---+---+ +---+---+
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| R1 | | R2 |
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+---+---+ +---+---+
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| |
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+---+--------------------+---+
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| bridge-net |
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+-------------+--------------+
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+-------------+--------------+
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| R3 |
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+---+--------------------+---+
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| net1 net2 |
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+---+-----+-+ +---+-+---+
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| |
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+---------+-+ +--+--------+
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| Instance1 | | Instance2 |
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+-----------+ +-----------+
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Figure 1 Logical topology in central Neutron
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As shown in Fig. 1, each external network(i.e., ext-net1, ext-net2) will connect to a Router(i.e., R1, R2).
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These routers will take charge of routing NS traffic and connect with the logical(non-local) router through
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bridge network. This is the networking model in the spec [1]_, a routed network is using to manage the
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external networks in central Neutron.
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When we create a logical router(i.e., R3) in central Neutron, Tricircle will create local router in each region.
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Then attach the network(i.e, net1, net2) to central router(i.e, R3), this router will take charge of all
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traffic (no matter NS or EW traffic).
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For EW traffic, from net1 to net2, R3(in net1's region) will forwards packets to the
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interface of net2 in R3(in net2's region) router namespace. For NS traffic, R3 forwards
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packets to the interface of an available local router (i.e., R1 or R2)
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which attached to the real external network.
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More details in the specs of A New Layer-3 Networking multi-NS-with-EW-enabled [1]
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How to use segment for managing multiple networks in this network topology
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==========================================================================
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1. Enable the configuration of enable_l3_route_network in /tricircle/network/central_plugin.py
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.. code-block:: console
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cfg.BoolOpt('enable_l3_route_network',
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default=True,
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help=_('Whether using new l3 networking model. When it is'
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'set True, Tricircle will create a local router'
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'automatically after creating an external network'))
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2. Add segment plugin in /etc/neutron/neutron.conf.0
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.. code-block:: console
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service_plugins = tricircle.network.segment_plugin.TricircleSegmentPlugin
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Now we start to create segments and subnetworks.
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.. code-block:: console
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stack@stack-atom:~/devstack$ openstack multiregion networking pod list
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stack@stack-atom:~/devstack$ openstack multiregion networking pod create --region-name CentralRegion
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+-------------+--------------------------------------+
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| Field | Value |
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+-------------+--------------------------------------+
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| az_name | |
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| dc_name | |
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| pod_az_name | |
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| pod_id | f2f5757d-350f-4278-91a4-3baca12ebccc |
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| region_name | CentralRegion |
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+-------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack multiregion networking pod create --region-name RegionOne --availability-zone az1
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+-------------+--------------------------------------+
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| Field | Value |
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+-------------+--------------------------------------+
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| az_name | az1 |
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| dc_name | |
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| pod_az_name | |
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| pod_id | 7c34177a-a210-4edc-a5ca-b9615a7061b3 |
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| region_name | RegionOne |
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+-------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion network create --share --provider-physical-network extern --provider-network-type vlan --provider-segment 3005 multisegment
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+---------------------------+--------------------------------------+
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| Field | Value |
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+---------------------------+--------------------------------------+
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| admin_state_up | UP |
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| availability_zone_hints | |
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| availability_zones | None |
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| created_at | None |
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| description | None |
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| dns_domain | None |
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| id | e848d653-e777-4715-9596-bd0427d9fd27 |
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| ipv4_address_scope | None |
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| ipv6_address_scope | None |
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| is_default | None |
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| is_vlan_transparent | None |
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| location | None |
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| mtu | None |
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| name | multisegment |
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| port_security_enabled | False |
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| project_id | 1f31124fadd247f18098a20a6da207ec |
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| provider:network_type | vlan |
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| provider:physical_network | extern |
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| provider:segmentation_id | 3005 |
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| qos_policy_id | None |
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| revision_number | None |
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| router:external | Internal |
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| segments | None |
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| shared | True |
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| status | ACTIVE |
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| subnets | |
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| tags | |
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| updated_at | None |
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+---------------------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion network segment create --physical-network extern --network-type vlan --segment 3005 --network multisegment newl3-RegionOne-sgmtnet01
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+------------------+--------------------------------------+
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| Field | Value |
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+------------------+--------------------------------------+
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| description | |
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| id | 802ccc73-1c99-455e-858a-1c19d77d1995 |
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| location | None |
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| name | newl3-RegionOne-sgmtnet01 |
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| network_id | e848d653-e777-4715-9596-bd0427d9fd27 |
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| network_type | vlan |
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| physical_network | extern |
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| segmentation_id | 3005 |
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+------------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion network list
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+--------------------------------------+---------------------------+---------+
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| ID | Name | Subnets |
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+--------------------------------------+---------------------------+---------+
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| 5596d53f-d6ed-4ac5-9722-ad7e3e82e187 | newl3-RegionOne-sgmtnet01 | |
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| e848d653-e777-4715-9596-bd0427d9fd27 | multisegment | |
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+--------------------------------------+---------------------------+---------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=RegionOne network list
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+--------------------------------------+---------------------------+---------+
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| ID | Name | Subnets |
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+--------------------------------------+---------------------------+---------+
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| 2b9f4e56-57be-4624-87b9-ab745ec321c0 | newl3-RegionOne-sgmtnet01 | |
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+--------------------------------------+---------------------------+---------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion subnet create --network newl3-RegionOne-sgmtnet01 --subnet-range 10.0.0.0/24 newl3segment01-subnet-v4
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+-------------------+--------------------------------------+
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| Field | Value |
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+-------------------+--------------------------------------+
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| allocation_pools | 10.0.0.2-10.0.0.254 |
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| cidr | 10.0.0.0/24 |
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| created_at | 2018-11-28T09:22:39Z |
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| description | |
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| dns_nameservers | |
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| enable_dhcp | True |
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| gateway_ip | 10.0.0.1 |
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| host_routes | |
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| id | f00f7eb0-a72a-4c25-8f71-46e3d872064a |
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| ip_version | 4 |
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| ipv6_address_mode | None |
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| ipv6_ra_mode | None |
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| location | None |
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| name | newl3segment01-subnet-v4 |
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| network_id | 5596d53f-d6ed-4ac5-9722-ad7e3e82e187 |
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| project_id | 1f31124fadd247f18098a20a6da207ec |
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| revision_number | 0 |
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| segment_id | None |
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| service_types | None |
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| subnetpool_id | None |
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| tags | |
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| updated_at | 2018-11-28T09:22:39Z |
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+-------------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion network list
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+--------------------------------------+---------------------------+--------------------------------------+
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| ID | Name | Subnets |
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+--------------------------------------+---------------------------+--------------------------------------+
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| 5596d53f-d6ed-4ac5-9722-ad7e3e82e187 | newl3-RegionOne-sgmtnet01 | f00f7eb0-a72a-4c25-8f71-46e3d872064a |
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| e848d653-e777-4715-9596-bd0427d9fd27 | multisegment | |
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+--------------------------------------+---------------------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion subnet list
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+--------------------------------------+--------------------------+--------------------------------------+-------------+
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| ID | Name | Network | Subnet |
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+--------------------------------------+--------------------------+--------------------------------------+-------------+
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| f00f7eb0-a72a-4c25-8f71-46e3d872064a | newl3segment01-subnet-v4 | 5596d53f-d6ed-4ac5-9722-ad7e3e82e187 | 10.0.0.0/24 |
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+--------------------------------------+--------------------------+--------------------------------------+-------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=RegionOne network list
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+--------------------------------------+---------------------------+--------------------------------------+
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| ID | Name | Subnets |
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+--------------------------------------+---------------------------+--------------------------------------+
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| 2b9f4e56-57be-4624-87b9-ab745ec321c0 | newl3-RegionOne-sgmtnet01 | f00f7eb0-a72a-4c25-8f71-46e3d872064a |
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+--------------------------------------+---------------------------+--------------------------------------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=RegionOne subnet list
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+--------------------------------------+--------------------------------------+--------------------------------------+-------------+
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| ID | Name | Network | Subnet |
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+--------------------------------------+--------------------------------------+--------------------------------------+-------------+
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| f00f7eb0-a72a-4c25-8f71-46e3d872064a | f00f7eb0-a72a-4c25-8f71-46e3d872064a | 2b9f4e56-57be-4624-87b9-ab745ec321c0 | 10.0.0.0/24 |
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+--------------------------------------+--------------------------------------+--------------------------------------+-------------+
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This part is for how to delete segments and subnetworks.
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.. code-block:: console
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion subnet delete newl3segment01-subnet-v4
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion subnet list
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stack@stack-atom:~/devstack$ openstack --os-region-name=RegionOne subnet list
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion network delete newl3-RegionOne-sgmtnet01
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stack@stack-atom:~/devstack$ openstack --os-region-name=CentralRegion network list
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+--------------------------------------+--------------+---------+
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| ID | Name | Subnets |
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+--------------------------------------+--------------+---------+
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| e848d653-e777-4715-9596-bd0427d9fd27 | multisegment | |
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+--------------------------------------+--------------+---------+
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stack@stack-atom:~/devstack$ openstack --os-region-name=RegionOne network list
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stack@stack-atom:~/devstack$
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Reference
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=========
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.. [1] https://github.com/openstack/tricircle/blob/master/specs/stein/new-l3-networking-mulit-NS-with-EW.rst
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@ -10,3 +10,4 @@ Networking Scenario
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networking-guide-multiple-ns-with-ew-enabled.rst
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networking-guide-single-external-network.rst
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networking-guide-local-networking.rst
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networking-guide-newL3-using-segment.rst
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