yahoo-eng-team team mailing list archive

[Carl Baldwin <carl@xxxxxxxxxxxxx>]

We won't support this on the API.  But, I don't think we'd need to
anyway.  Let me explain...

In the Neutron model, routers attach to subnets, a part of the network.
If you show the network, it lists the subnets that belong to it:

$ neutron net-show private
+-------------------------+--------------+
| Field                   | Value        |
+-------------------------+--------------+
...
| subnets                 | c03e61b6-... |
|                         | 45dec6b6-... |
...
+-------------------------+--------------+

Listing a router's ports will show the subnets to which it is attached:

$ neutron router-port-list router1
+--------------+------------------------------------------------------------------+
| id           | fixed_ips                                                        |
+--------------+------------------------------------------------------------------+
| 2597d0aa-... | {"subnet_id": "c03e61b6-...", "ip_address": "10.0.0.1"}          |
| d40960c3-... | {"subnet_id": "45dec6b6-...", "ip_address": "fd80:a290:1ca0::1"} |
+--------------+------------------------------------------------------------------+

>From here, it is just a matter of iterating over routers which could be
a pain if there are many routers but it is possible.  The router-port-
list command simply uses the port GET API [1] and passes the device_id
of the router.    Looking at that API, I see we could do better.  By
passing network_id instead of the router's device ID, we get a list of
ports on the network.  Filtering by
device_owner="network:router_interface" should give just the router
ports connected to the network.  Within these ports, the device_id will
be the router id of the router connected.  I was able to prove this
works with the existing API using this URL [2] against one of my
devstacks.  It worked!  From here it is just a matter of iterating the
ports in the result and gather the router id(s) and de-duplicating the
list since one router can have multiple ports on the network.

If anything, this is a neutron client request.

[1] http://developer.openstack.org/api-ref-networking-v2.html#ports
[2] http://10.224.24.226:9696/v2.0/ports?network_id=31c0cb78-a381-405f-9349-6f2f944aec25&device_owner=network:router_interface

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

** Changed in: python-neutronclient
   Importance: Undecided => Wishlist

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

** Summary changed:

- neutron network-show should display the router
+ It is difficult to find routers connected given a neutron network

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1562067

Title:
  It is difficult to find routers connected given a neutron network

Status in neutron:
  Won't Fix
Status in python-neutronclient:
  New

Bug description:
  Neutron net-show should display the router the network is attached to
  if it is attached to a router.  There doesn't appear to be any way to
  start with a network name/ID and determine the router that network is
  using.

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