Learning OpenStack Networking - Third Edition

Assigning a default subnet pool

A default subnet pool can be defined that allows users to create subnets without specifying a prefix or a subnet pool. At subnet creation, use both the --default-prefix-length and --default arguments to make the subnet pool the default pool for a particular network. A subnet pool can also be updated to become the default subnet pool by using the same argument.

The following command demonstrates setting MySubnetPool as the default subnet pool:

# openstack subnet pool set --default MySubnetPool 

No output is returned upon successful completion of the preceding command.

The following screenshot demonstrates the creation of a new subnet using the default subnet pool:

As you can see, Neutron automatically carved ...