04-12-2010 05:27 AM - edited 03-04-2019 08:07 AM
Hello everyone,
I am facing a strange problem We have Cisco 3845 router and ISP has provided a MPLS link. When we terminate it on laptop our next hop starts pinging. but when we connect it on router it donot ping to next hop. We changed the slot of WIC card and also replaced the card. After replacing the card and changing the slot we were properly recieving the ping replies but it stops after some time. Interface remains up and up . No log is there is logging.
Please suggest if there any way to get the exact problem or how to resolve the problem
Thanks,
Hemant
04-12-2010 05:45 AM
please post a sh interface fa x/x !
check output hangs ? errors ?
04-12-2010 05:54 AM
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 02:08:01, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/22994/0 (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
18312085 packets input, 3573047684 bytes
Received 22148 broadcasts, 0 runts, 0 giants, 0 throttles
1 input errors, 0 CRC, 1 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
29238839 packets output, 3470205501 bytes, 0 underruns
291840 output errors, 315890 collisions, 4 interface resets
0 unknown protocol drops
0 babbles, 138884 late collision, 38754 deferred
9 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped
out
04-12-2010 05:57 AM
could you please change the duplex to full and do the ping test ?
04-12-2010 06:00 AM
it is negotiated by it. we have configured that interfa
ce to duplex auto and speed auto
Thanks
04-12-2010 06:09 AM
sharma,
if one side is hard coded to full duplex (sp side) and the other side to auto (your side),
the side configured for auto should fall back to half duplex ..
configuring a full duplex should do the job !
again would be interested to know link speed/duplex mode of your Laptop NIC card too which you were telling worked without any issues.
04-12-2010 06:31 AM
laptop is working on auto auto also when I change router port to full duplex . it's line protocol goes down.
04-12-2010 06:00 AM
Why do you have the interface set to half-duplex?
Change it to full-duplex so that you should not see collision errors and not so many output errors.
You can clear the interface counters and try the connection again to see if the errors persist.
I assume that when you connect the laptop or the router, you're using the same IP configuration on both?
Are you hardcoding the IP information or getting it dynamically?
Federico.
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