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New Member

WAN link problem


My MWR 1941-DC router has 4 e1 link. One of the serial link shows ::

x#sh inter s 0/2:0

Serial0/2:0 is up, line protocol is up

Hardware is GT96K Serial

Description: BOGRA LINK

Internet address is

MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:09, output 00:00:09, output hang never

Last clearing of "show interface" counters 00:08:39

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

52 packets input, 2306 bytes, 0 no buffer

Received 52 broadcasts, 0 runts, 0 giants, 0 throttles

9 input errors, 9 CRC, 4 frame, 3 overrun, 0 ignored, 4 abort

117 packets output, 22992 bytes, 0 underruns

0 output errors, 0 collisions, 29 interface resets

0 output buffer failures, 0 output buffers swapped out

2 carrier transitions

Timeslot(s) Used:1-31, SCC: 2, Transmitter delay is 0 flags


but I can neither ping the remote router nor pass the data. I have checked every configuration with remote router and found everything is okay. Acually it is working for 9 months. No configuration has been changed. The trouble is the link goes off now and then. And the last two weeks , the link is behaving like this.

==========sh contr e1===========

x#sh controllers e1 0/2

E1 0/2 is up.

Applique type is Channelized E1 - balanced

Description: BOGRA LINK

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20030516, FPGA: 15

Framing is CRC4, Line Code is HDB3, Clock Source is Line Primary.

VWIC relays are closed

Link noise monitor disabled

Data in current interval (168 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs


note that clear counter command has been given..


Re: WAN link problem


you are using HDLC encapsulation, I assume that is correct ? From your output, it can be seen that you have a relatively high percentage of CRC, input, and frame errors. That usually indicates a physical problem with either the interface card, the cable, or the modem attached to the serial line. If possible, try and connect the line to another interface, and replace the cable. Also, you could ask your ISP to do a test, they ca usually get to their own modem. If that test is ok, you know it is a problem at your side...



New Member

Re: WAN link problem

Hi bikash,

Have you tried Extended ping to see if there is a issue with the MTU size ?

What is the other end device connected to MWR ?

Send me configurations of both ends

Show run interface serial 0/2:0

and controller configuration.