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[Rodolfo Alonso <1907089@xxxxxxxxxxxxxxxxxx>]

RFE implementation not attended, reopen if needed.

** Changed in: neutron
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1907089

Title:
  [RFE] Add BFD support for Neutron

Status in neutron:
  Won't Fix

Bug description:
  I plan to open a spec with more details as gerrit is more suitable for
  discussions.

  # Problem description

  BFD (Bidirectional Forwarding Detection) is used to detect link failures between routers.
  It can be helpful to detect 
  * if an extra route (a nexthop-destination pair) is alive or not, and change routes accordingly.
  * Can help routing protocols like ECMP or BGP to change routing decisions based on link status.

  # Proposed change (more details are coming in the spec)

  * Add the following new APIs to Neutron:
  ** Handle (Create, list, show, update, delete) bfd_monitors:
  POST /v2.0/bfd_monitors
  GET /v2.0/bfd_monitors
  GET /v2.0/bfd_monitors/{monitor_uuid}
  DELETE POST /v2.0/bfd_monitors/{monitor_uuid}
  PUT /v2.0/bfd_monitors/{monitor_uuid}

  ** Get the current status of a bfd_monitor (As current status can be fetched from the backend it can be an expensive operation so better to not mix it with show bfd_monitors operation)
  GET /v2.0/bfd_monitors/{monitor_uuid}/monitor_status

  * Change the existing router API
  ** Associate a bfd_monitor to an extra route
  PUT /v2.0/routers/{router_uuid}/add_extraroutes OR PUT /v2.0/routers/{router_id}
  {"router" : {"routes" : [{ "destination" : "10.0.3.0/24", "nexthop" : "10.0.0.13" , "bfd": <bfd_monitor_id>}]}}

  ** show routes status for a given router:
  GET /v2.0/routers/{router_id}/routes_status

  BFD not only gives monitoring option, but generally used to allow quick response to link status changes. 
  In Neutron case this can be the removal of dead route from the routing table, and adding it back if the monitor status goes to UP again. Other backends, and switch/routing implementations can have more sophisticated solutions of course.

  A simple opensource backend can be OVS, as OVS is capable of BFD
  monitoring.

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