Troubleshooting a Serial WIC

[frankw77]

I have a 1720 with a serial wic that I think may be going bad. Are there any methods of determining whether or not it is faulty hardware? This is a remote location so I will have to diagnose via telnet.

Thanks.

 

[fmonteiro]

What are the symptoms of this problem? Is the serial interface flapping (up/down several times)? Is there any message logged for this interface (as this is a remote router you may set the logging to buffer or to a syslog server so you could check it from time to time)?
Would you post the output for a sh interface serial?

 

[frankw77]

Here is the int

Serial0 is up, line protocol is up
Hardware is PowerQUICC Serial
Description: James West 918-744-4012
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliablility 255/255, txload 1/255, rxload 1/255
Encapsulation FRAME-RELAY, loopback not set
Keepalive set (10 sec)
LMI enq sent 75240, LMI stat recvd 75239, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 1023 LMI type is CISCO frame relay DTE
Broadcast queue 0/64, broadcasts sent/dropped 175172/0, interface broadcasts 162634
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 2000 bits/sec, 4 packets/sec
5 minute output rate 2000 bits/sec, 3 packets/sec
1320482 packets input, 120222436 bytes, 0 no buffer
Received 75241 broadcasts, 0 runts, 0 giants, 0 throttles
1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort
1321209 packets output, 110776998 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up


Symptoms are intermittent time outs, lost packets, ping times that will occasionally go through the roof for a period of about 1-2 minutes. CSU is error free, all cables have been checked and tested. The only other thing I can think of is that we might have a bad V.35 cable.

 

[mattlal]

I would set the blame on the ISP.

 

[frankw77]

I am checking on the network side with our vendor, just wanted to see if there was a way to troubleshoot the card to eliminate that from the equation.

 

[fmonteiro]

It does not look like a WIC interface problem. When we do have a interface problem normally the interface flaps. Interface errors ans signals are also fine. Nothing relevant. If you have a spare port you may change the link to this port to evaluate or at least change the V.35 cable as you suggested. At this point I am with mattlal, I would check with the ISP.

 

[frankw77]

Thanks everyone!

 

[mtashiro]

Put a loopback plug in the WIC and test. When you put the loopback plug in you should see the line come up. Try pinging the interface using exetended ping and see what errors you see. No errors, card is probably good.