Carlos,
Emulation and simulation is not the same thing.
Any way, look this two links:
https://github.com/mininet/mininet/wiki/pdf/mininet-hifi-bdh2.pdf
https://reproducingnetworkresearch.wordpress.com/
And explore the parameters bw, delay, loss and max_queue_size in the
Mininet addLink.
By the way, with openvswitch +ryu you will not see the right bandwidth, but
the maximum one.
Regards,
Minicz
2017-09-07 7:51 GMT-03:00 Carlos Ferreira <carlosmf...@gmail.com>:
> Hello again Mr. Ross,
>
> Yes, you are correct. An emulator should emulate every single aspect
> of a network, from network equipment's to network links. That is why
> simulators such as NS3 and Opnet exist.
> But mininet is a different type of emulator. It uses OpenVSwitch and
> the Linux kernel software bridges to "emulate" the network. I
> emphasise the "emulate" because there's no real emulation of a
> network. Its just a bunch of software switches logically connected to
> software bridges, moving memory pointers from one interface to the
> other.
> This is why you won't see any packet errors or collisions. Regarding
> the packet losses, I'm pretty sure that will only happen if the system
> runs out of memory, since the packets aren't really moving in memory
> when crossing interfaces... it's just pointers at the end of the day.
>
>
> On 7 September 2017 at 09:57, corey ross <coreyvr...@gmail.com> wrote:
> >> I don't think there will ever be any packet drops or network
> >>
> >> congestion, since all network adaptors are software adaptors.
> >
> >
> > Mr. Ferreira but I thought mininet is an emulator! shouldn't a netowrk
> > emulator behave like a real world network?
> >
> > --------------
> >
> > Mr. Iwase thanks for your reply. I think the rx_dropped, tx_dropped, and
> > collisions are the values that I need.
> >
> > Would you also guide me on what is the best way to calculate the overall
> > packet drops and congestion in the network for a period of time (because
> > there are 9 switches and each switch have number of ports)? should I take
> > the average these values or you suggest any other methods to calculate
> the
> > packet drops and congestion?
> >
> >
> > On Thu, Sep 7, 2017 at 5:52 AM, Iwase Yusuke <iwase.yusu...@gmail.com>
> > wrote:
> >>
> >> Hi,
> >>
> >> Excuse me for jumping in.
> >>
> >> I don't know whether it is able to reproduce drops or network congestion
> >> on mininet, but for getting their statistics, you can use OFPPortStats
> >> request and reply.
> >>
> >>
> >> http://ryu.readthedocs.io/en/latest/ofproto_v1_3_ref.html#
> ryu.ofproto.ofproto_v1_3_parser.OFPPortStatsReply
> >>
> >> Thanks,
> >> Iwase
> >>
> >
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>
>
>
> --
>
> Carlos Miguel Ferreira
> Researcher at Telecommunications Institute
> Aveiro - Portugal
> Work E-mail - c...@av.it.pt
> Skype & GTalk -> carlosmf...@gmail.com
> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
>
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