With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mplsVpnVrfRouteDistinguisher
mpls Vpn Vrf Route Distinguisher
1.3.6.1.3.118.1.2.2.1.3
The route distinguisher for this VRF.
Back to MPLS-VPN-MIB MIB page.
IPHost Network monitor allows you to monitor mplsVpnVrfRouteDistinguisher on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.