Configuring Network Namespaces VLANs and GRE Tunnels with OpenvSwitch

http://blog.scottlowe.org/2013/09/09/namespaces-vlans-open-vswitch-and-gre-tunnels/

Difference between Access (Tagged) port and Trunk port

http://www.techopedia.com/definition/27009/access-port

http://www.techopedia.com/definition/27008/trunk-port

http://www.firewall.cx/networking-topics/vlan-networks/218-vlan-access-trunk-links.html