The value of vRtrLdpIfTransportAddrType specifies the source
of the transport address to be used when setting up the LDP TCP
sessions. This value is meaningful only in case of LDP
interfaces and not for targeted peers.
When the value of this object is 'interface', the interface's
IP address is used to setup the LDP session between neighbors.
If multiple interfaces exist between two neighbors, the
'interface' mode cannot be used since only one LDP session is
actually set up between the two neighbors.
When the value of this object is 'system', the system's IP address
is used to set up the LDP session between neighbors.