Visualizing traffic flow when using Open vSwitch

When using the Open vSwitch driver, for an Ethernet frame to travel from the virtual machine instance to the physical network, it will pass through many different interfaces, including the following:

Network Type	Interface Type	Interface Name
all	tap	tapN
all	bridge	qbrXXXX (only used with the iptables firewall driver)
all	veth	qvbXXXX, qvoXXXX (only used with the iptables firewall driver)
all	vSwitch	br-int
flat, vlan	vSwitch	br-ex (user-configurable)
vxlan, gre	vSwitch	br-tun
flat, vlan	patch	int-br-ethX, phy-br-ethX
vxlan, gre	patch	patch-tun, patch-int
flat, vlan	physical	ethX (where X is the interface)

 

The Open vSwitch bridge br-int is known as the integration bridge. The integration bridge is the central virtual switch that most virtual devices are connected to, including instances, DHCP servers, routers, and more. When Neutron security groups are enabled and the iptables firewall driver is used, instances are not directly connected to the integration bridge. Instead...