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Agent

Neutron-dynamic-routing implements a new agent named "DRAgent". The agent talks to the neutron-dynamic-routing plugin which resides in the neutron server to get routing entity configuration. DRAgent interacts with the back-end driver to realize the required dynamic routing protocol functionality. For details, please refer to the system design document system-design

Note

One DRAgent can support multiple drivers but currently ONLY os-ken is integrated successfully.

Scheduler

Neutron-dynamic-routing scheduler, schedules a routing entity to a proper DRAgent.

BGP Scheduler

BGP Speaker and DRAgent has 1:N association which means one BGP speaker can be scheduled on multiple DRAgents.

There are different options for the scheduling algorithm to be used, these can be selected via the bgp_drscheduler_driver configuration option.

StaticScheduler

This is the most simple option, which does no automatic scheduling at all. Instead it relies on API requests to explicitly associate BGP speaker with DRAgents and to disassociate them again.

Sample configuration:

bgp_drscheduler_driver = neutron_dynamic_routing.services.bgp.scheduler.bgp_dragent_scheduler.StaticScheduler

Here is an example to associate/disassociate a BGP Speaker to/from a DRAgent.

(neutron) bgp-speaker-list
+--------------------------------------+------+----------+------------+
| id                                   | name | local_as | ip_version |
+--------------------------------------+------+----------+------------+
| 0967eb04-59e5-4ca6-a0b0-d584d8d4a132 | bgp2 |      200 |          4 |
| a73432c3-a3fc-4b1e-9be2-6c32a61df579 | bgp1 |      100 |          4 |
+--------------------------------------+------+----------+------------+

(neutron) agent-list
+--------------------------------------+---------------------------+---------------------+-------------------+-------+----------------+---------------------------+
| id                                   | agent_type                | host                | availability_zone | alive | admin_state_up | binary                    |
+--------------------------------------+---------------------------+---------------------+-------------------+-------+----------------+---------------------------+
| 0c21a829-4fd6-4375-8e65-36db4dc434ac | DHCP agent                | steve-devstack-test | nova              | :-)   | True           | neutron-dhcp-agent        |
| 0f9d6886-910d-4af4-b248-673b22eb9e78 | Metadata agent            | steve-devstack-test |                   | :-)   | True           | neutron-metadata-agent    |
| 5908a304-b9d9-4e8c-a0af-96a066a7c87e | Open vSwitch agent        | steve-devstack-test |                   | :-)   | True           | neutron-openvswitch-agent |
| ae74e375-6a75-4ebe-b85c-6628d2baf02f | L3 agent                  | steve-devstack-test | nova              | :-)   | True           | neutron-l3-agent          |
| dbd9900e-9d16-444d-afc4-8d0035df5ed5 | BGP dynamic routing agent | steve-devstack-test |                   | :-)   | True           | neutron-bgp-dragent       |
+--------------------------------------+---------------------------+---------------------+-------------------+-------+----------------+---------------------------+

(neutron) bgp-dragent-speaker-add dbd9900e-9d16-444d-afc4-8d0035df5ed5 bgp1
Associated BGP speaker bgp1 to the Dynamic Routing agent.

(neutron) bgp-speaker-list-on-dragent dbd9900e-9d16-444d-afc4-8d0035df5ed5
+--------------------------------------+------+----------+------------+
| id                                   | name | local_as | ip_version |
+--------------------------------------+------+----------+------------+
| a73432c3-a3fc-4b1e-9be2-6c32a61df579 | bgp1 |      100 |          4 |
+--------------------------------------+------+----------+------------+

(neutron) bgp-dragent-speaker-remove dbd9900e-9d16-444d-afc4-8d0035df5ed5 bgp1
Disassociated BGP speaker bgp1 from the Dynamic Routing agent.

(neutron) bgp-speaker-list-on-dragent dbd9900e-9d16-444d-afc4-8d0035df5ed5

(neutron)

ReST API's for neutron-dynamic-routing scheduler are defined as part of the Neutron API reference.

ChanceScheduler

This is the default option. It will automatically schedule newly created BGP speakers to one of the active DRAgents. When a DRAgent goes down, the BGP speaker will be disassociated from it and an attempt is made to schedule it to a different agent. Note that this action will override any manual associations that have been performed via the API, so you will want to use this scheduler only in very basic deployments.