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New Member

Bad Pings to PC

I'm pinging a device from a switch that keeps err-disabling from link flap. I've disabled link flap detect on the switch so it doesn't keep going down. The PC and switchport are both set to 100 full. I've moved the PC to a different switch and still the same result. When I first start pinging, the pings are pretty good. Then after a couple of minutes they start looking like below.

sh int fa0/41

FastEthernet0/41 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is 0014.f27a.6b2d (bia 0014.f27a.6b2d)

  Description: EMSEDU

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 00:00:01, output hang never

  Last clearing of "show interface" counters 00:23:54

  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 21000 bits/sec, 16 packets/sec

  5 minute output rate 10000 bits/sec, 17 packets/sec

     56388 packets input, 6961775 bytes, 0 no buffer

     Received 14 broadcasts (0 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     60233 packets output, 8935188 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 PAUSE output

     0 output buffer failures, 0 output buffers swapped out

Pings from switch:






Any suggestions?

Thanks, Pat.

  • LAN Switching and Routing

Accepted Solutions

Re: Bad Pings to PC

Seeing that you changed ports it can only be cabling or a bad nic .  


Re: Bad Pings to PC

Seeing that you changed ports it can only be cabling or a bad nic .  

New Member

Re: Bad Pings to PC

It was a bad cable. The bad cable was the one from the patch panel to the switchport. I should make a habit of including them in the test. I assume they are ok.



Re: Bad Pings to PC

Hi Patrick,

Please let us know what was the problem if you have resolved it. I am curious :). Thank you!

But Glen is right, it definitely seems like bad cable or PC network interface card.

Best regards,


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