An indication of the operational status of
the FEC associated with LDP LSP.
unknown(1) - this is a temporary state which
may indicate the LSP-FEC association
is in a state of transition.
inUse(2) - the FEC associated with the LSP is
currently being applied.
notInUse(3) - the FEC associated with the LSP is
not being applied. Eventually, this
entry may be aged out.