Contains a list of Permitted Paths which specifies the Path(s)
into which the MAC may be inserted.
The value is a sum which represents the individual paths that
are desired. This value initially takes the value zero, then
for each type of PATH that this node is, 2 raised to a power is
added to the sum. The powers are according to the following table:
Path Power
---- -----
local 0
secondary-alternate 1
primary-alternate 2
concatenated-alternate 3
secondary-preferred 4
primary-preferred 5
concatenated-preferred 6
thru 7