Issue Description
After configuration was made current state of serial interface is up, current state of line protocol is down.
Handling Process
Degrade software on R3640E from VRP3.30-0005 to VRP1.74-0105.
Root Cause
Debug fr lmi on R3640E:
*0.2762171 R3640E FR/8/debug8: LMI: Serial1/0(down) DTE timeout
*0.2762171 R3640E FR/8/debug8: LMI: Serial1/0 (out) status enquiry, full
*0.2762172 R3640E FR/8/debug8: ssn = 254, rsn = 0
*0.2762173 R3640E FR/8/debug8: LMI: Serial1/0 in msg err (DTE in lmi enquiry)
*0.2772170 R3640E FR/8/debug8: LMI: Serial1/0(down) DTE timeout
*0.2772171 R3640E FR/8/debug8: LMI: Serial1/0 (out) status enquiry, full
*0.2772172 R3640E FR/8/debug8: ssn = 255, rsn = 0
*0.2772173 R3640E FR/8/debug8: LMI: Serial1/0 in msg err (DTE in lmi enquiry)
*0.2782171 R3640E FR/8/debug8: LMI: Serial1/0(down) DTE timeout
*0.2782180 R3640E FR/8/debug8: LMI: Serial1/0 (out) status enquiry, full
*0.2782180 R3640E FR/8/debug8: ssn = 1, rsn = 0
*0.2782182 R3640E FR/8/debug8: LMI: Serial1/0 in msg err (DTE in lmi enquiry)
*0.2792170 R3640E FR/8/debug8: LMI: Serial1/0(down) DTE timeout
Debug fr lmi on Cisco:
Jun 17 17:39:17: Serial1/7(down): DCE LMI timeout
Jun 17 17:39:32: Serial1/7(down): DCE LMI timeout
Jun 17 17:39:47: Serial1/7(down): DCE LMI timeout
Jun 17 17:40:02: Serial1/7(down): DCE LMI timeout
Jun 17 17:40:17: Serial1/7(down): DCE LMI timeout
Routers give this debug information independently of lmi type that was configured on routers:
1. q933a ?q933a
2. ansi ?ansi
3. nonstandard ?cisco
4. q933a ?ansi, in this case debug information is the same.