The value of vRtrLdpIfPassiveMode specifies the mode used for
setting up LDP sessions. This object is meaningful only in case
of LDP targeted peers and not for interfaces. When it has a
value of 'true', LDP responds only when it gets a connect request
from a peer and will not attempt to actively connect to its
neighbors. When it has a value of 'false', LDP actively tries to
connect to its peers.