hh3cMplsLdpCrlspErHopIpv4PrefixLen 1.3.6.1.4.1.25506.8.12.2.1.6.2.1.4

If hh3cMplsLdpCrlspErHopAddrType is ipV4(1), prefix length for this hop's IPv4 address. This object is not significant otherwise and should return a value of 0.