Describes to the
ircd which
IRC Servers are "Leaf" servers - that is to say, those that are on the "end" of the network...
Format:
L:disallowed server mask:*:allowed server mask:maximum connection depth
In cyclone at least, there's also (in no particular order) a K:Line, Q:Line, C:Line, N:Line, X:Line, A:Line, M:Line, Y:Line, I:Line, U:Line, O:Line, H:Line and a P:Line. There's also a G:Line