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The reason for this is because you can have multiple subnets on the same L2
bcast domain. You can use ip aliasing in order to use multiple subnets on
one virtual nic. For example ifconfig eth0:1 a.b.c.d/24; ifconfig eth0:2
d.e.f.g/24

Aaron

On Mon, Aug 13, 2012 at 7:52 PM, Takaaki Suzuki <suzuki at midokura.com> wrote:

> Hi all.
>
> I have one question. I prepared devstack with Qauntum V2.
> Now I can create Subnet for Network.
> And I can add multiple Subnet for one Network. VM can use multiple
> subnet for one virtual NIC?
> Why quantum v2 can create multiple subnet for one Network?
>
> quantum --os_token 1b73ace152c440ea939c2329fd115e56 --os_url
> http://localhost:9696/ net-list
>
> +----------------+--------------------------------------+-----------+--------+--------------------------------------+----------------------------------+
> | admin_state_up | id                                   | name      |
> status | subnets                              | tenant_id
>           |
>
> +----------------+--------------------------------------+-----------+--------+--------------------------------------+----------------------------------+
> | True           | d7a8106c-7ca6-4302-a065-6a87c859ed9c | test
> | ACTIVE | 474ea30c-9337-4f48-854c-9f572538a44c |
> 4fb66e3355304be5a6f3340d7067b369 |
> |                  |
>            |                |              |
> 52ffda8c-61aa-465b-ae62-1ef57e9bed85 |
>                         |
> |                  |
>            |                |              |
> 9a659285-c6b1-4e6f-b3f0-c3e37341e0be |
>                        |
>
> quantum --os_token 1b73ace152c440ea939c2329fd115e56 --os_url
> http://localhost:9696/ subnet-list
>
> +------------------------------------------------------+------------------+---------------+--------------------------------------+------------+--------+--------------------------------------+----------------------------------+
> | allocation_pools                                     | cidr
>    | gateway_ip    | id                                   | ip_version
> | name   | network_id                           | tenant_id
>             |
>
> +------------------------------------------------------+------------------+---------------+--------------------------------------+------------+--------+--------------------------------------+----------------------------------+
> | {"start": "192.168.100.2", "end": "192.168.100.254"} |
> 192.168.100.0/24 | 192.168.100.1 |
> 474ea30c-9337-4f48-854c-9f572538a44c |          4 | test01 |
> d7a8106c-7ca6-4302-a065-6a87c859ed9c |
> 4fb66e3355304be5a6f3340d7067b369 |
> | {"start": "192.168.210.2", "end": "192.168.210.254"} |
> 192.168.210.0/24 | 192.168.210.1 |
> 52ffda8c-61aa-465b-ae62-1ef57e9bed85 |          4 | test03 |
> d7a8106c-7ca6-4302-a065-6a87c859ed9c |
> 4fb66e3355304be5a6f3340d7067b369 |
> | {"start": "192.168.200.2", "end": "192.168.200.254"} |
> 192.168.200.0/24 | 192.168.200.1 |
> 9a659285-c6b1-4e6f-b3f0-c3e37341e0be |          4 | test02 |
> d7a8106c-7ca6-4302-a065-6a87c859ed9c |
> 4fb66e3355304be5a6f3340d7067b369 |
>
> +------------------------------------------------------+------------------+---------------+--------------------------------------+------------+--------+--------------------------------------+----------------------------------+
>
> Thanks!
> Suzuki
>
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