With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mplsInterfacePerfInLabelLookupFailures
mpls Interface Perf In Label Lookup Failures
1.3.6.1.3.96.1.2.1.2
This object counts the number of labeled packets that have been received on this interface and which were discarded because there was no matching cross- connect entry. This object MUST count on a per- interface basis regardless of which label space the interface participates in.
Back to MPLS-LSR-STD-MIB MIB page.
IPHost Network monitor allows you to monitor mplsInterfacePerfInLabelLookupFailures on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.