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I agree that I'd like to see a set of use cases for this. This is the second time in as many days that I've heard about a desire to have such a thing but I still don't think I understand any use cases adequately.

In the physical world it makes perfect sense, LACP, MLT, Etherchannel/Portchannel, etc. In the virtual world I need to see a detailed description of one or more use cases.

Shihanzhang, why don't you start up an Etherpad or something and start putting together a list of one or more practical use cases in which the same VM would benefit from multiple virtual connections to the same network. If it really makes sense we ought to be able to clearly describe it.

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From: Day, Phil [mailto:philip.day at hp.com]
Sent: Friday, January 24, 2014 09:11
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [nova]Why not allow to create a vm directly with two VIF in the same network

I agree its oddly inconsistent (you'll get used to that over time ;-)  - but to me it feels more like the validation is missing on the attach that that the create should allow two VIFs on the same network.   Since these are both virtualised (i.e share the same bandwidth, don't provide any additional resilience, etc) I'm curious about why you'd want two VIFs in this configuration ?

From: shihanzhang [mailto:ayshihanzhang at 126.com]
Sent: 24 January 2014 03:22
To: openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>
Subject: [openstack-dev] [nova]Why not allow to create a vm directly with two VIF in the same network

I am a beginer of nova, there is a problem which has confused me, in the latest version, it not allowed to create a vm directly with two VIF in the same network, but allowed to add a VIF that it network is same with a existed VIF'network, there is the use case that a vm with two VIF in the same network, but why not allow to create the vm directly with two VIF in the same network?

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