With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mplsInterfaceLabelMinOut
mpls Interface Label Min Out
1.3.6.1.3.96.1.1.1.4
This is the minimum value of an MPLS label that this LSR is willing to send on this interface.
Back to MPLS-LSR-STD-MIB MIB page.
IPHost Network monitor allows you to monitor mplsInterfaceLabelMinOut on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.