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.1...@gmail.com> wrote: > 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@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) > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > -- Kevin Benton
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