Open Stack

In a dual stack deployment there may be a v4 and a v6 subnet on the same
network.

There's also the case that a service provider has a notion of a public
network, which is represented by a UUID.  After a period of time, they may
run out of IPs in one subnet, and want to assign another subnet as well,
without forcing tenants to have to start using a new identifier for the
public network.   Of course, the provider would be responsible for creating
L3 connectivity between the two subnets.

Others can chime in, but those where the two cases that I remember.

Dan


On Mon, Aug 13, 2012 at 8:31 PM, Aaron Rosen <arosen at nicira.com> wrote:

> 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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>
>
> _______________________________________________
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>


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dan Wendlandt
Nicira, Inc: www.nicira.com
twitter: danwendlandt
~~~~~~~~~~~~~~~~~~~~~~~~~~~
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