The value of vRtrLdpPolicyType indicates the type of policy
specified in this row entry.
When vRtrLdpPolicyType has a value of 'import' this row
entry represents the policy filter to be applied to the label
binding received from a neighbor.
When the value is 'export', this row entry represents the
policy filter to determine the labels to be advertised to the
neighbors.
When the value is 'ingress', this row entry represents the
policy filter to control the route prefixes that are advertised
by LDP to the route table. LDP will advertise label bindings
of prefixes that are advertised into it.
When the value is 'egress', this row entry represents the
policy filter to control the route prefixes that are advertised
into LDP from the route table. LDP will advertise label bindings
of prefixes that are advertised into it.
This object is obsoleted in release 2.1.