A port in Neutron is a logical connection of a virtual network interface to a subnet. Ports can be associated with virtual machine instances, DHCP servers, routers, firewalls, load balancers, and more. Ports can even be created simply to reserve IP addresses from a subnet. Neutron stores port relationships in the Neutron database and uses this information to build switching connections at the physical or virtual switch layer through the networking plugin and agent.
To retrieve a list of all Neutron ports, use the Neutron port-list command, as shown in the following screenshot:
Figure 5.26
Use the Neutron port-show command to see the details of a particular port:
Figure 5.27
The port pictured in Figure 5.27 is owned by an interface used within a DHCP namespace. The network_id field reveals the network to be 3282acdf-85d1-47ea-b734-f5625cfca027, otherwise known as the MyFlatNetwork network, which was created earlier in this chapter.