If fsMIBfdSessMapType is ldpipv4(1) or ldpipv6(2), then this object MUST contain zeroDotZero or point to an instance of the mplsXCEntry indicating the LDP-based LSP associated with this BFD session. If fsMIBfdSessMapType is rsvpipv4(3) or rsvpipv6(4), then this object MUST contain zeroDotZero or point to an instance of the mplsTunnelEntry indicating the RSVP-based MPLS TE tunnel associated with this BFD session. If fsMIBfdSessMapType is pw(5), then this object MUST contain zeroDotZero or point to an instance of the pwEntry indicating the MPLS Pseudowire associated with this BFD session. If fsMIBfdSessMapType is mep(6). then this object MUST contain zeroDotZero or point to an instance identifying the MEP entity configured for monitoring the MPLS-TP path associated with this BFD session. If this object points to a conceptual row instance in a table consistent with fsMIBfdSessMapType but this instance does not currently exist then no valid path is associated with this session entry. If this object contains zeroDotZero then no valid path is associated with this BFD session entry till it is populated with a valid pointer consistent with the value of fsMIBfdSessMapType as explained above.