Really it is not scope, but sort of distance to the destination.
NOWHERE are reserved for not existing destinations, HOST is our
local addresses, LINK are destinations, located on directly attached
link and UNIVERSE is everywhere in the Universe.
Intermediate values are also possible f.e. interior routes
could be assigned a value between UNIVERSE and LINK.
Really it is not scope, but sort of distance to the destination. NOWHERE are reserved for not existing destinations, HOST is our local addresses, LINK are destinations, located on directly attached link and UNIVERSE is everywhere in the Universe. Intermediate values are also possible f.e. interior routes could be assigned a value between UNIVERSE and LINK.