This object contains a string which mentions the meaning for the return code along with the return subcode Return code Meaning 0 No return code 1 Malformed echo request received 2 One or more of the TLVs was not understood 3 Replying router is an egress for the FEC at stackdepth <RSC> 4 Replying router has no mapping for the 5 Downstream Mapping Mismatch 6 Upstream Interface Index Unknown 7 Reserved 8 Label switched at stack-depth <RSC> 9 Label switched but no MPLS forwarding at stack-depth <RSC> 10 Mapping for this FEC is not the given label at stackdepth<RSC> 11 No label entry at stack-depth <RSC> 12 Protocol not associated with interface at FEC stackdepth <RSC> 13 Premature termination of ping due to label stack shrinking to a single label FEC at stackdepth <RSC>