Cloned from launchpad blueprint https://blueprints.launchpad.net/neutron/+spec/adding-default-router-attribute.

Description:

Now in quantum, there is not a default router attribute.
When I create a router, It is created by adding a default attribute to the specific router. 
When I create multiple routers, One of them is selected as a default router.

It would work such as a security group

Specification URL (additional information):

None