We have an atm link from delhi to Singapor and we are running ospf on both the router. sometimes neighborship get broken and still it shows atm pvc up and up.when i try to ping from our end to far end router's atm interface it does not ping. I just wanted to know whether problem is in provider's atm cloud or in the router and i also want to knwo the protocol which is used to verify the status of atm pvc
You can use ATM OAM cells to verify the connectivity end-to-end. Check "Using OAM for PVC Management" for more details and configuration examples.
Hope this helps!