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<div>Try this, I found it very useful.</div>
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<div><a href="https://openstack.redhat.com/Networking_in_too_much_detail">https://openstack.redhat.com/Networking_in_too_much_detail</a></div>
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<div>Danny</div>
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<div style="font-family: Consolas; font-size: medium;">Date: Sun, 14 Dec 2014 21:25:24 +0100</div>
<div style="font-family: Consolas; font-size: medium;">From: Uwe Sauter <<a href="mailto:uwe.sauter.de@gmail.com">uwe.sauter.de@gmail.com</a>></div>
<div style="font-family: Consolas; font-size: medium;">To: Gonzalo Aguilar Delgado <<a href="mailto:gaguilar@aguilardelgado.com">gaguilar@aguilardelgado.com</a>></div>
<div style="font-family: Consolas; font-size: medium;">Cc: <a href="mailto:openstack@lists.openstack.org">openstack@lists.openstack.org</a></div>
<div style="font-family: Consolas; font-size: medium;">Subject: Re: [Openstack] What's physical network for?</div>
<div style="font-family: Consolas; font-size: medium;">Message-ID: <<a href="mailto:548DF234.4060905@gmail.com">548DF234.4060905@gmail.com</a>></div>
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<div style="font-family: Consolas; font-size: medium;">As far as I know, bridge_mapping is used to let neutron know which</div>
<div style="font-family: Consolas; font-size: medium;">bridge should be uses for the (possibly more than one) external network(s).</div>
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<div style="font-family: Consolas; font-size: medium;">If someone else could jump in and give a bit more detail, I'd appreciate</div>
<div style="font-family: Consolas; font-size: medium;">that, too.</div>
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<div style="font-family: Consolas; font-size: medium;">Regards,</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>Uwe</div>
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<div style="font-family: Consolas; font-size: medium;">Am 14.12.2014 um 20:55 schrieb Gonzalo Aguilar Delgado:</div>
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<div>Hi Uwe,</div>
<div></div>
<div>really I started directly with neutron. Never gone with legacy.</div>
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<div>But I suppose there's old config laying around. I still think that</div>
<div>bridge_mapping is needed for VLAN config I use. Every paper describes</div>
<div>GRE config, but I still feel more confortable using VLANs.</div>
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<div>Any other help about this issue? Can someone confirm if I can get rid of</div>
<div>the directives in both configs?</div>
<div></div>
<div>I suppose I cannot because they get in effect when started the ovs plugin.</div>
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<div>Thank you in advance.</div>
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<div>El dom, 14 de dic 2014 a las 8:40 , Uwe Sauter <<a href="mailto:uwe.sauter.de@gmail.com">uwe.sauter.de@gmail.com</a>></div>
<div>escribi?:</div>
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<div>Hi, I presume that you upgraded from an older version that used</div>
<div>nova-network (now called legacy networking). Using neutron means that</div>
<div>VMs aren't connected to br0 directly any more as there is a whole</div>
<div>virtual networking infrastructure in place. To give a small overview:</div>
<div>On a compute node a VM connects to br-int (integration bridge). This</div>
<div>bridge itself is connected through a virtual cable to br-tun</div>
<div>(tunneling bridge). That bridge has also assigned a physical interface</div>
<div>that allows traffic to flow to the network node On the network node</div>
<div>there also exists a br-tun that has a physical interface attached.</div>
<div>Through this inferface traffic enters the node. br-tun is virtually</div>
<div>connected to br-ex that has a separate physical interface attached</div>
<div>that connects to "the outside", meaning the networking infrastructure</div>
<div>outside your cloud. I cannot help you with the configuration issue but</div>
<div>recommend that you familiarize yourself with neutron. Regards, Uwe Am</div>
<div>14.12.2014 um 19:36 schrieb Gonzalo Aguilar Delgado:</div>
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<div> Hi all, I'm installing a new compute node from scratch and</div>
<div> reviewing all old config. I've found two setting that seems equal,</div>
<div> one in ml2 plugin and one in openvswitch. But I don't really</div>
<div> understand why they are. ovs_neutron_plugin.ini: bridge_mappings =</div>
<div> default:br0,extnet1:br-ex ml2/ml2_conf.ini: [ovs] bridge_mappings</div>
<div> = default:br0,extnet1:br-ex For me it's strange the settings are</div>
<div> in both places. I think this is a result of upgrading without</div>
<div> taking much care of removing old config. But also it's strange</div>
<div> that everything works with the bridges br0 and br-ex without</div>
<div> physical interface. I mean, seems to do nothing but it needs to be</div>
<div> there. Also I should expect VM be attached to br0 (Default) but</div>
<div> it's not, they are attached to the br-int (integration bridge),</div>
<div> for me this is correct. Since it's described here like this:</div>
<div> <a href="https://openstack.redhat.com/Networking_in_too_much_detail">https://openstack.redhat.com/Networking_in_too_much_detail</a> And</div>
<div> works ok. So what's the purporse of these bridges? Here is:</div>
<div> neutron 2.3.4 nova 2.17.0 Best regards,</div>
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