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How to Find average bandwidth using "show interface" command?

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  • How to Find average bandwidth using "show interface" command?

    I'm trying to find the average bandwidth usage going in and out of my gateway cisco router. The interface that connects to the dsl modem is Dialer0. From what I understand, you can run the command "show interfaces Dialer0" and receive a 5 minute input and output rate. I'll paste the output of this command and hopefully somebody can help me figure out what all of it means.

    Code:
    Dialer0 is up, line protocol is up (spoofing)
      Hardware is Unknown
      Description: $FW_OUTSIDE$
      Internet address is ?.?.?.?/30
      MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, 
         reliability 255/255, txload 6/255, rxload 15/255
      Encapsulation PPP, loopback not set
      Keepalive set (10 sec)
      DTR is pulsed for 1 seconds on reset
      Interface is bound to Vi2
      Last input never, output never, output hang never
      Last clearing of "show interface" counters 00:05:22
      Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
      Queueing strategy: weighted fair
      Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
         Conversations  0/1/16 (active/max active/max total)
         Reserved Conversations 0/0 (allocated/max allocated)
         Available Bandwidth 42 kilobits/sec
      5 minute input rate 135000 bits/sec, 5 packets/sec
      5 minute output rate 3000 bits/sec, 4 packets/sec
         5227 packets input, 3604435 bytes
         4768 packets output, 979241 bytes
    Bound to:
    Virtual-Access2 is up, line protocol is up 
      Hardware is Virtual Access interface
      MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, 
         reliability 255/255, txload 59/255, rxload 48/255
      Encapsulation PPP, LCP Open
      Open: IPCP
      PPPoE vaccess, cloned from Dialer0
      Vaccess status 0x44, loopback not set
      Keepalive set (10 sec)
      Interface is bound to Di0 (Encapsulation PPP)
      Last input 00:00:00, output never, output hang never
      Last clearing of "show interface" counters 2d07h
      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 123000 bits/sec, 10 packets/sec
      5 minute output rate 13000 bits/sec, 11 packets/sec
         3733144 packets input, 3075510708 bytes, 0 no buffer
         Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
         0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
         3138445 packets output, 947687308 bytes, 0 underruns
         0 output errors, 0 collisions, 0 interface resets
         0 output buffer failures, 0 output buffers swapped out
         0 carrier transitions
    As you see, there are 2 sections: the Dialer0 section and the Virtual-Access2 section, each with there own 5 minute input/output rate.
    To begin, I'm not sure which section I should be using. I think I should be using the top section, Dialer0, but I'm not really sure. If so, it says:

    Code:
     5 minute input rate 135000 bits/sec, 5 packets/sec
      5 minute output rate 3000 bits/sec, 4 packets/sec
         5227 packets input, 3604435 bytes
         4768 packets output, 979241 bytes
    Does this roughly mean that over the past 5 minutes 135000 bits/sec came from WAN to LAN and 3000 bits/sec went from LAN to WAN?

  • #2
    Re: How to Find average bandwidth using "show interface" command?

    Hello ingram,

    I think you have got the picture.

    Code:
    5 minute input rate 135000 bits/sec, 5 packets/sec
    5 minute output rate 3000 bits/sec, 4 packets/sec
    This is the average speed that the traffic came in and out for that time period.

    5227 packets input, 3604435 bytes
    4768 packets output, 979241 bytes
    This is the volume of traffic for that time period.

    There are some free and commecial network monitoring software packages that can give you much more data about in/out traffic on your device.

    You setup NetFlow and/or SNMP on your gateway and use the collector/monitoring software to manage the data collection and do the analysis.

    Such as MRTG, PRTG, ManageEngine, solarwinds, cacti, etc.
    Check'm out.

    regards...

    Comment


    • #3
      Re: How to Find average bandwidth using "show interface" command?

      What about the 2 different sections? Why is there the Dialer0 section and the Virtual-Access2 section, each with their own 5 minute input/output rate?

      Comment

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