[Openstack] Flat provider_network with vlan tagged interface or vlan provider_network with untagged interface

Kevin Benton blak111 at gmail.com
Wed Dec 3 04:03:07 UTC 2014

Setting up the interfaces manually and using a flat network doesn't scale
well when you want to do it hundreds of times. Using ML2+linuxbridge will
do the same thing in an automated fashion.

On Tue, Dec 2, 2014 at 6:32 PM, Abhijeet Rastogi <abhijeet.1989 at gmail.com>

> Hi everyone,
> This is a very basic doubt and I'm trying to understand this
> fundamental thing about creating networks in neutron. My ultimate goal
> is to have all instances contain just one interface and a public IP on
> them. Now, this public IP can only exist in a specific VLAN, lets say,
> they'll only exist on eth0.123 (the is a vlan tagged interface on the
> host and I can directly bind public IPs to them and they work
> perfectly). I'm using linux bridge + ML2 as the plugin for neutron.
> So, the ultimate goal will be something like:
> [root at compute1 ~]# brctl show
> bridge name     bridge id               STP enabled     interfaces
> brq732eb7f9-16          8000.002590c6438e       no              eth0.123
>                       tap81474f06-29
> Now, with my limited knowledge, there are 2 ways of doing this:-
> 1. Create the vlan tagged interface manually and then setup "flat"
> provider networking with physical_interface_mappings set with
> eth0.123.
> 2. Use a "vlan" provider network and mention "123" as the vlan id in that.
> I observed that, both of these approaches eventually create the same
> kind of bridge configuration. Can anyone explain what's going on and
> when to use what? I'm sure I'm missing a key concept and I'll be glad
> if someone can clear that for me.
> --
> Cheers,
> Abhijeet Rastogi (shadyabhi)
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Kevin Benton
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