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Is there a way to check the current interface output/input rate on Cisco devices? the interface statistics only give the average over 5 minutes, and monitoring the interface seems to have a very long lag (as it also only shows the updated value over 5 minutes).

When I do a show interface on a Juniper device, it gives the current input/output rate.. is there a way to do this on a Cisco device?

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  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can provide your own answer and accept it.
    – Ron Maupin ♦
    Aug 6, 2017 at 23:56

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An I/O rate must be over some time period since it is a number of bits per time period, just like your speed in a car is an average of the number of miles per hour. The Cisco device can change the time period for the average of a particular interface with the interface command, load-interval.

Your Juniper has to have a time period over which it averages the number of bits. It may be a one second time period, but you can't get bits per second unless you count the over a one second (or longer) time period.

Normally, you do want an I/O rate averaged over a time period longer than 1 second since it smooths out bursts and gives you a more accurate picture of throughput on an interface.

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  • How do I use the load-interval command to show it over a second?
    – user2883071
    Oct 23, 2015 at 20:48
  • You can use the command to lower the interval. You could try 1 second, but, I believe, the minimum is 30 seconds. A one second interval really isn't useful information. Are you sure the Juniper uses a one second interval?
    – Ron Maupin ♦
    Oct 23, 2015 at 20:59
  • 30s is as low as it goes.
    – Ricky
    Oct 23, 2015 at 21:55
  • Well.. as soon as I start passing traffic, the Juniper device shows the exact rate of traffic I am sending (In the show interfaces command).. It is very close to real time. The Cisco device on the other hand.. I have to wait around 7 minutes to get the exact amount of traffic being sent
    – user2883071
    Oct 24, 2015 at 21:27
  • Cisco also shows current traffic, but it is over a time period. For instance, if I set it to 30 seconds, all traffic from the last 30 seconds, including the traffic which pass as I was typing the command are included. The Juniper also gives you the same sort of thing, but I don't know over what time period it uses. I'm not sure what you are trying to get.
    – Ron Maupin ♦
    Oct 24, 2015 at 21:32

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