BRAS ------- Cisco 7200
tranmission device --------------- OSN 3500
BRAS1-1 ------> 3092-7-IDQ1-ATM 1
The ping request from the MSAN UA5000 is recieved by the BRAS but the BRAS cannot respond to the MSAN UA5000.
The error message on BRAS appear is "encapsulation failed".
There is no alarm on the OSN 3500.
The alarm visible on the BRAS Cisco 7200 is "ENCAPSULATION FAILED"
The internal port type configured is UNI which need to be changed to NNI. After the internal port type is changed to NNI the state of the external port is changed from deactivate to active. when we ping the BRAS IP address the ping response is ok.
In the OSN configuration the port type mentioned in the "internal port" is inactive although the physical media is in working condition. The port type of the "internal Port" is set to UNI but there required to set it to NNI.
There need to check the MSAN UA5000 configuration. the IMA link and IMA group need to be in the active and operational state and the alarm status is NO.