C. Configurable Constants
The OSPF protocol has quite a few configurable parameters. These
parameters are listed below. They are grouped into general
functional categories (area parameters, interface parameters, etc.).
Sample values are given for some of the parameters.
Some parameter settings need to be consistent among groups of
routers. For example, all routers in an area must agree on that
area's parameters, and all routers attached to a network must agree
on that network's IP network number and mask.
Some parameters may be determined by router algorithms outside of
this specification (e.g., the address of a host connected to the
router via a SLIP line). From OSPF's point of view, these items are
still configurable.