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I learned that I could introduce delay on serial interface by using the command

      delay 'yyyyy'

Can I also do this if I am using gigabitEthernet interface?

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  • Two questions. 1) why? 2) Try it and find out!
    – EEAA
    Commented Sep 22, 2015 at 4:23
  • I have a network emulator but it's no longer working efficiently, I am looking for other ways in order to introduce delay to my network. I used that command already on my switch, but it did not affect the delay. I am wondering if there are other commands that I need to add.
    – cnm21
    Commented Sep 22, 2015 at 4:30
  • You might want to look into Dummynet which is a full-featured link emulator. It also has Linux and OS X ports, if you are not at ease with FreeBSD. Building a bridge with dummynet policies in between should allow you to define bandwidth restrictions as well as delay/loss parameters for your emulated link.
    – the-wabbit
    Commented Sep 22, 2015 at 12:02

1 Answer 1

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Depends on the model of a switch, but the short answer would be yes, but this wouldn't be that simple as you imagine because:

  • delays are just the thing that modern networks are fighting with
  • thus, you would need to simulate low link speed instead
  • this is done by QoS, not rate-limiting, because rate-limiting is the primitive form of policing that would rather drop your packets than delay them
  • QoS isn't supported just by every piece of a Cisco equipment, so it depends on the model

In the end this isn't that elementary.

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