With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mplsTunnelHopIpv4PrefixLen
mpls Tunnel Hop Ipv4 Prefix Len
1.3.6.1.3.95.2.4.1.6
If mplsTunnelHopAddrType is ipV4(1), then the prefix length for this hop's IPv4 address is contained herein. This object is otherwise insignificant and should contain a value of 0.
Back to MPLS-TE-MIB MIB page.
IPHost Network monitor allows you to monitor mplsTunnelHopIpv4PrefixLen on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.