With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mplsInterfaceLabelMinIn
mpls Interface Label Min In
1.3.6.1.3.96.1.1.1.2
This is the minimum value of an MPLS label that this LSR is willing to receive on this interface.
Back to MPLS-LSR-STD-MIB MIB page.
IPHost Network monitor allows you to monitor mplsInterfaceLabelMinIn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.