Oid L2TP tunnel status

Hello community, We are trying to monitor the status (up or down) of l2tp tunnel of every E500 and E400 device that we have, and We are thinking in a script, we are looking for in the mibs file of those devices, but We cannot find this Oid. 

Could you tell me the Oid of the l2tp tunnel status?

I attach here a pic of the status that We can get the oid


At present, OID for tunnel status is not supported. 

Thank you for your fast answer