how to check packet loss on router

Answered Question
Sep 28th, 2011

Hello,

I have to determine if packets are being lost between my IP cisco phones on one site to the call manager on other site through my cisco router.  What do I I do on the router to see if packets are being lost?

Thanks.

I have this problem too.
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Correct Answer by scott.brien14 about 2 years 6 months ago

show interface if_type

Last clearing of "show interface" counters never

  Input queue: 0/2000/20408/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 293000 bits/sec, 128 packets/sec

  5 minute output rate 989000 bits/sec, 148 packets/sec

     1247270683 packets input, 1721112099278 bytes, 0 no buffer

     Received 6485788 broadcasts (436942 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

     825292982 packets output, 184712093707 bytes, 0 underruns

     0 output errors, 0 collisions, 1 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

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Average Rating: 5 (1 ratings)
Correct Answer
scott.brien14 Wed, 09/28/2011 - 22:33

show interface if_type

Last clearing of "show interface" counters never

  Input queue: 0/2000/20408/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 293000 bits/sec, 128 packets/sec

  5 minute output rate 989000 bits/sec, 148 packets/sec

     1247270683 packets input, 1721112099278 bytes, 0 no buffer

     Received 6485788 broadcasts (436942 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

     825292982 packets output, 184712093707 bytes, 0 underruns

     0 output errors, 0 collisions, 1 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

naiduccnp Thu, 09/29/2011 - 00:04

Hi Horacio,

The above show interface will give you only total output drops: 0
If you want to see packet loss between one end and other end you need to use any tool which provide you the network latency and packet loss.

Also you can run the below script which provide you the latency and packet drops.
Rune the below script from yoru one site to call manager which is at other site.


:22
ping *callmanagerip* -n 120 >>callmanagerip.txt
echo. |time >>callmanagerip.txt
goto 22


Please rate the helpful posts.
Regards,
Naidu.

sharone.job Fri, 09/30/2011 - 05:22

Naidu,

     Could you pls explain the script,

:22

ping *callmanagerip* -n 120 >>callmanagerip.txt

echo. |time >>callmanagerip.txt

goto 22

What does this 22 means?

Sukanta Biswas Fri, 09/30/2011 - 03:16

Hi,

You can try what others are suggested. But extended ping with 50 to 100 repeat count and 500 or 1000 datagram size and  would be a good test from router interface to your voice vlan. This would give you if there is any packet drops marked as dot(.)

Hope this helps

Please rate accordingly if it is helpful.

Regards

Sukanta

naiduccnp Fri, 09/30/2011 - 05:53

Hi Horacio,

When you run the script, it will do continues ping to your callmanagerip and get the output details in to notepad as "callmanagerip.txt
So that you can get to know the latency and packetloss to your callmanger.


Please rate the helpful posts.
Regards,
Naidu.

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Posted September 28, 2011 at 7:16 PM
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