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On Fri, Oct 11, 2013 at 4:41 PM, Marco Fornaro <Marco.Fornaro at huawei.com>wrote:

>  Hi All,****
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> (I already posted this on openstack mail list, but perhaps it’s more a
> developer stuff J)****
>
> Some Tricky questions I ask help for (email 1 of 2):****
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> *Quantum Network object*
>
> In the “openstack networking guide”->”Using Openstack compute with
> Openstack”->” Advanced VM creation” (
> http://docs.openstack.org/grizzly/openstack-network/admin/content/advanceed_vm_creation.html)
> there are example boot a VM on one or more NETWORKs (meaning the quantum
> Network object):  ****
>
> nova boot --image <img> --flavor <flavor> \****
>
> *--nic net-id=<net1-id> --nic net-id=<net2-id>* <vm-name>****
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> BUT if you look at the description of the network object in the API
> abstraction it looks like a collection of subnets (meaning the quantum
> object), so basically a collection of IP Addresses like 192.168.100.0/24**
> **
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> *SO (first question): what happens in the network where I boot the VM has
> more than a subnet?...I suppose the VM should have a nic for EACH subnet of
> the network!*
>
You will just get a nic for each network, not for each subnet of the
network.   to choose the subnet, use --nic
net-id=net-uuid,v4-fixed-ip=ip-addr

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> *THEN (second question): why do I need a network object? Shouldn’t it be
> more practical to have just the subnet object?..why do I need to create a
> Network if it’s just a collection of subnets?*
>
under the hood, the traffic among networks are isolated by tunnel id, vlan
id or something else. You can create networks with just one subnet, but the
vlan id will run out soon if vlan is used.
we can have many networks, and the subnets within network can have overlap
IPs.

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> Thanks in advance for any help****
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> Best Regards****
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> Marco****
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>
>
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