we have a strange situation, we had some ATM links and they have been worked for several years but three days ago suddenly all of the links goes down. all of the configuration are the same and everything are like before but there is't any type of connection between two side of links while interfaces are UP also PVC is UP but steel we don't have simple ICMP ping.
i need make sure that the problem is from provider side , could someone help me?? i really appreciate it
