Bandwidth Calculation from rx tx value

[Ninad Thakare]

Hi,

Can any one help, how to calculate bandwidth utlization from " sh int" details..?

Can the percentage will get calculated from rx tx values..?

I am using 4 mbps lease line.

FastEthernet0/0/0 is up, line protocol is up

Hardware is FastEthernet, address is 001a.6c70.4b14 (bia 001a.6c70.4b14)

Description: Internet Connection

Internet address is 1.1.1.1/30

MTU 1500 bytes, BW 4000 Kbit, DLY 100 usec,

     reliability 255/255, txload 31/255, rxload 120/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

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

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

Last clearing of "show interface" counters never

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 828000 bits/sec, 111 packets/sec

5 minute output rate 498000 bits/sec, 92 packets/sec

     788931865 packets input, 4036778275 bytes

     Received 398 broadcasts, 0 runts, 0 giants, 0 throttles

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

     0 watchdog

     0 input packets with dribble condition detected

     571607354 packets output, 3639639717 bytes, 0 underruns

Thanks in Advance,

Regards,

Ninad Thakare

[Sandeep Choudhary]

HI Ninad,

I think you have got the picture.

5 minute input rate 828000 bits/sec, 111 packets/sec

5 minute output rate 498000 bits/sec, 92 packets/sec

This is the volume of traffic for that time period.

---------------------------------------------------------------------

first of all change the input rate to 30 seconds.

config t

load-interval 30

exit

then use

sh int f0/1 | inc drops|bits

it will show you how much trafic going through or any packet drops as well.

Regards

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[Ninad Thakare]

Hi sandeep,

I changed have changed the load interval to 30. And found the following output.

FastEthernet0/0/0 is up, line protocol is up

  Hardware is FastEthernet, address is 001a.6c70.4b14 (bia 001a.6c70.4b14)

  Description: Internet Connection

  Internet address is 115.111.129.54/30

  MTU 1500 bytes, BW 4000 Kbit, DLY 100 usec,

     reliability 255/255, txload 20/255, rxload 178/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, 100BaseTX/FX

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

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

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  30 second input rate 2648000 bits/sec, 282 packets/sec

  30 second output rate 329000 bits/sec, 187 packets/sec

     807938619 packets input, 3336210079 bytes

     Received 400 broadcasts, 0 runts, 0 giants, 0 throttles

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

     0 watchdog

     0 input packets with dribble condition detected

     584946689 packets output, 2374024442 bytes, 0 underruns

     0 output errors, 0 collisions, 4 interface resets

     0 babbles, 0 late collision, 0 deferred

     1 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

Now how should i calculate...?

Regards,

Ninad Thakare

[Sandeep Choudhary]

Hi Ninad,

This is the volume of traffic for that time period.

 30 second input rate 2648000 bits/sec, 282 packets/sec
 30 second output rate 329000 bits/sec, 187 packets/sec
807938619 packets input, 3336210079 bytes
584946689 packets output, 2374024442 bytes, 0 underruns

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

Regards

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[Joseph W. Doherty · Accepted solution]

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Posting

There are several ways to do this, but if your link is 4 Mbps, use the bandwidth statement on the interface and set to 4000 (I think I recall it uses K, if not correct value would be 4000000).

Then when you looks at tx or rx loads, those are the load ratios.  e.g. 128/255 = 50%, 64/255 = 25%.

[Ninad Thakare]

Hi,

Thanks for help. I got the logic behind it.

Thanks everyone.

Regards,

Ninad Thakare

[Sandeep Choudhary]

Glad that u got ur answer.

Regards

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