With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mplsVpnVrfRouteMask
mpls Vpn Vrf Route Mask
1.3.6.1.3.118.1.4.1.1.3
Indicate the mask to be logical-ANDed with the destination address before being compared to the value in the mplsVpnVrfRouteDest field. For those systems that do not support arbitrary subnet masks, an agent constructs the value of the mplsVpnVrfRouteMask by reference to the IP Address Class. Any assignment (implicit or otherwise) of an instance of this object to a value x must be rejected if the bit-wise logical-AND of x with the value of the corresponding instance of the mplsVpnVrfRouteDest object is not equal to mplsVpnVrfRouteDest.
Back to MPLS-VPN-MIB MIB page.
IPHost Network monitor allows you to monitor mplsVpnVrfRouteMask 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.