With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwFlowPathInvalidSourceDataPktsDrops
Cisco's ASN Gateway Flow Path Invalid Source Data Packets Drops
1.3.6.1.4.1.9.9.638.1.3.1.1.1.49
The number of data packets dropped due to invalid source path address in the GRE header.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwFlowPathInvalidSourceDataPktsDrops 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.