Create first local network (II)-5 minutes a day to play OpenStack (81)

In the previous section, "First_local_net" was created through the Web GUI, and we need to figure out what changes have been made to the underlying network structure.

Click on the "First_local_net" link to display the subnet and port information for the network.

A port has been created in the Ports list named "(a5bd3746-3f89)", IP is 172.16.1.2, attached Device is network:dhcp. Here we just need to know that the port corresponds to the DHCP interface, as to how DHCP works is discussed in detail later in the chapter.

Open the shell terminal of the control node and use Brctl Show to view the status of the current Linux bridge.

You can see that Neutron automatically created the following two devices:

Bridge Equipment Brqbb9b6d21-c6
The brqbb9b6d21-c6 corresponds to the local network "First_local_net", and the naming convention is brqxxx,xxx for the first 11 characters of the network ID.

Tap Device tapa5bd3746-3f
tapa5bd3746-3f corresponds to Port (a5bd3746-3f89), the naming convention is tapyyy, and YYY is the first 11 characters of the Port ID. The tap device is connected to bridge, which is connected to the local network.

The local network is ready, and in the next section we will deploy a instance and connect it to the network.

Create first local network (II)-5 minutes a day to play OpenStack (81)