> For the complete documentation index, see [llms.txt](https://yeasy.gitbook.io/openstack_code_neutron/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yeasy.gitbook.io/openstack_code_neutron/neutron/common/constantspy.md).

# constants.py

定义一些常量，例如各种资源的ACTIVE、BUILD、DOWN、ERROR状态，DHCP等网络协议端口号，VLAN TAG范围等。