Neutron has been pretty much a mystery to me until recently when I decided I'd give it some serious time and figure it out. I'm still in the process. But by reading these 3 fine blogs I dare say I've got some ideas how metadata works with Neutron.
http://vietstack.wordpress.com/2014/09/27/introduction-of-metadata-service-in-openstack/
- This one mainly illustrates metadata service with dhcp agent. Nice drawings by the way.
http://techbackground.blogspot.com/2013/06/metadata-via-quantum-router.html
- This one tells the story about metadata service with l3 agent.
http://kimizhang.wordpress.com/2014/11/11/how-to-use-meta-data-service-for-vm-with-provider-network/
- This final piece deals with a more practical scenario where provider network is needed.
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