Open Stack

You got it wrong.

br-int (Intergration bridge) - This is like a point-of-presence for instances to connect and send network traffic.

br-tun (tunnel bridge) - This bridge serves as the tunnel endpoints. This is also a part of your data network. This is also used by VM. The intent is to have each tenant traffic in a separate tunnel. Packets leaving the instance will carry no vlan id. In br-int flow rules will add a vlan to the packets from each instance( the vlan id depends on the network ) . In br-tun there is one flow to translate the vlan to a particular tunnel id.  So packets leaving br-tun carry tunnel id according to the tenant.

The br-tun of various nodes (computes and network node) form a mesh of tunnels through which the vm data flows.

Once you create br-tun and restart the neutron ovs plugin you can see the flow rules using 'ovs-ofctl dump-flows br-int/ br-tun'

If you do ovs-vsctl show you will see that the br-tun of various nodes have formed a mesh of tunnels.

You do not need any bridge for management.

Thank you,
Ageeleshwar K



________________________________
From: cheniour ghassen [ghacheniour at gmail.com]
Sent: Tuesday, March 25, 2014 6:15 PM
To: Ageeleshwar Kandavelu
Subject: Re: [Openstack] floatting ip are not created

Hi Ageeleshwar,
I want to thank you first for your answer. I am using gre mode. As i know br-tun are using for management And br-int are used for data forwarding beteween the VMs. As documented in the openstack docs, I have created br-int and indicated tha br-tun are for management.
I think the problem is because neutron doesn't detect the agents. The below pdf file contain some configurations.
Thank you and i am looking forward for your answer.
sincerely,
Ghassen Cheniour.



On Tue, Mar 25, 2014 at 1:33 PM, Ageeleshwar Kandavelu <Ageeleshwar.Kandavelu at csscorp.com<mailto:Ageeleshwar.Kandavelu at csscorp.com>> wrote:
If you are using gre mode. you have to create br-tun and restart your neutron-ovs agent.

If you are using vlan you have to create all bridges mentioned in bridge_mappings inside '/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini'

You can not expect your floating ip to work untill you can ping the external router from your instance(using vnc window)

Thank you,
Ageeleshwar K
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