Address Assignment
Click on the red underlined text to get to the source
... topology
(and allowed topology changes) to match address assignment. Or, (b)
avoid constraints on the topology ...
... Fuller, V., Li, T., Yu, J., and K. Varadhan, "Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy", RFC 1519(-> 4632), September 1993. ...