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Hi Gong,

Thanks so much for your answers

Just one more question: you wrote "You can create networks with just one subnet, but the vlan id will run out soon if vlan is used."
Sorry but: how can the Vlan ID "run out soon"?...is it really possible to finish them?

Best Regards

Marco


From: Yongsheng Gong [mailto:gongysh at unitedstack.com]
Sent: den 11 oktober 2013 10:56
To: OpenStack Development Mailing List
Subject: Re: [openstack-dev] Tricky questions - 1/2 Quantum Network Object



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

(I already posted this on openstack mail list, but perhaps it's more a developer stuff :))
Some Tricky questions I ask help for (email 1 of 2):


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>

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<http://192.168.100.0/24>

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

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.


Thanks in advance for any help

Best Regards

Marco




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