Resolved! Problem with back-to-back frame relay
Serial0/0/1 is down, line protocol is down Hardware is GT96K Serial in async mode Description: ** MODBUS data From BR-A ** MTU 1500 bytes, BW 9 Kbit, DLY 100000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation SLIP, loopbac...