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[XU Xiaodan <1759790@xxxxxxxxxxxxxxxxxx>]

** Also affects: python-openstackclient
   Importance: Undecided
       Status: New

** Changed in: python-openstackclient
       Status: New => Confirmed

** Changed in: python-openstackclient
     Assignee: (unassigned) => XU Xiaodan (xiaodan)

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https://bugs.launchpad.net/bugs/1759790

Title:
  [RFE] metric for the route

Status in neutron:
  Confirmed
Status in python-openstackclient:
  Confirmed

Bug description:
  Problem Description
  ===================

  A routing metric is a quantitative value used to evaluate the path cost.
  But neutron can't specify a different metric with the same destination address,which is useful to realize FRR(Fast Reroute) in Telecoms and NFV scenario.

  There is no optional argument for metric:
  root@ubuntudbs:/home/dbs# neutron router-update --help
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  usage: neutron router-update [-h] [--name NAME] [--description DESCRIPTION]
                               [--admin-state-up {True,False}]
                               [--distributed {True,False}]
                               [--route destination=CIDR,nexthop=IP_ADDR | --no-routes]
                               ROUTER

  root@ubuntudbs:/home/dbs# openstack router set --help
  usage: openstack router set [-h] [--name <name>] [--description <description>]
                              [--enable | --disable]
                              [--distributed | --centralized]
                              [--route destination=<subnet>,gateway=<ip-address>]
                              [--no-route] [--ha | --no-ha]
                              [--external-gateway <network>]
                              [--fixed-ip subnet=<subnet>,ip-address=<ip-address>]
                              [--enable-snat | --disable-snat] [--tag <tag>]
                              [--no-tag]
                              <router>

  Proposal
  ========

  A new optional argument metric can be added to set the metric for the routes.
  This value can be set by the user or have a default value.

  Command Line Client Impact
  --------------------------

  ::

    openstack router set [--route destination=<subnet>,
                                  gateway=<ip-address>,
                                  metric=<metric>] <router>

    neutron router-update [--route destination=CIDR,
                                   nexthop=IP_ADDR,
                                   metric=METRIC | --no-routes] ROUTER

  Argument metric is optional.

  REST API Impact
  ---------------

  A new API extension to the routes resource is going to be introduced.
  Set the metric for the routes :

  .. code-block:: python

     PUT /v2.0/routers/{router_id}
     Accept: application/json
     {
         "router": {
             "routes": [
              {
                  "destination": "179.24.1.0/24",
                  "nexthop": "172.24.3.99"
                  "metric": "100"
              }
          ]
         }
     }

  References
  ==========

  .. [1] api-ref for the neutron router,
     https://developer.openstack.org/api-ref/network/v2/index.html#routers-routers

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