I has this topology as follows:
host2
|
[eth2]
ovs2
/ \
/ \
host1--ovs1 ovs3--host3
i set queue tables on ovs2,created two queues,assigned queue0 with rate
400mbps~500mbps,and queue1 with rate 600mbps~700mbps.
Then on controller i run command: ./nox_core -ptcp:6633 pyswitch
At last on ovs2 i run command: ./ovs-ofctl add flow br0 "in_port=1(note:ovs1)
ip nw_dst=xx.xx.xx.xx(note:host2 ip) idle_timeout=0 actions=enqueue:4:0(note:to
make flows from port1 follow queue0 rule)"
Then i push data from host1 to host2, the rate is limited to 400mbps~500mbps.
However,i do the same as above except that i changed command on controller to:
./nox_core -ptcp:6633 routing, the rate is not limited at all.
I thought it might be the routing module problem since the rate is limited with
pyswitch.
Shan
----- Original Message -----
From: "Murphy McCauley" <jam...@nau.edu>
To: "Shan Hu" <shan...@utdallas.edu>
Cc: "nox-dev" <nox-dev@noxrepo.org>
Sent: Thursday, November 10, 2011 3:41:04 PM
Subject: Re: [nox-dev] what is the difference between pyswitch and routing
module?
How did you implement rate limiting with pyswitch, and how are you trying to do
it with routing?
I'm not sure exactly what you mean about the modules of NOX. They're all in
the various coreapps/netapps/webapps directories in the NOX source repository.
Not all of them are documented on the wiki (or anywhere, necessarily, except
maybe the doxygen).
-- Murphy
On Nov 10, 2011, at 1:35 PM, Shan Hu wrote:
> Thank you very much for the explanation, Murphy.
>
> Right now,I try to reserve bandwidth and limit rate with the queue table, it
> works great with pyswitch component,but it doesnt work with routing
> component.What reason could it be?
>
> And another question,where can i find all the modules of NOX?There are not
> much in the noxwiki.Or, those in noxwiki already include all existing modules?
>
> regards,
> Shan
>
> ----- Original Message -----
> From: "Murphy McCauley" <jam...@nau.edu>
> To: "Shan Hu" <shan...@utdallas.edu>
> Cc: "nox-dev" <nox-dev@noxrepo.org>
> Sent: Thursday, November 3, 2011 11:44:33 AM
> Subject: Re: [nox-dev] what is the difference between pyswitch and routing
> module?
>
> pyswitch is intended to be a very simple demo and does something along the
> lines of making each switch in the network a standalone L2 learning switch.
> Each switch gets no insight about the topology from its neighbors. routing
> actually uses a global view of the topology, and can just generate optimal
> paths between any two endpoints.
>
> A major result of this is that when running pyswitch, each switch needs to
> learn which port to use for each destination. Before it learns, each switch
> will need to flood packets for destinations it doesn't know yet -- a lot of
> packets will get sent the "wrong way". With routing, once ANY switch can
> determine where a destination is, the entire system knows. Additionally,
> pyswitch's reliance on flooding is problematic for topologies with loops --
> it's easy for packets to unknown destinations to loop indefinitely.
>
> Hope that helps clear things up.
>
> -- Murphy
>
> On Nov 2, 2011, at 11:34 AM, Shan Hu wrote:
>
>> I'm wondering what's the different between routing module and pyswitch
>> module?
>>
>> I can find from wiki that routing is basically a forwarding module. but what
>> about pyswitch?
>>
>> Because after i connected 3 openvswitchs(like this:host1 -- ovs1 -- ovs2 --
>> ovs3 --host2),i firstly ran pyswitch module,then host1 can ping host2,
>> however,i tried to run UDP traffic test,and found that the larger bandwidth
>> i use, the more packet loss there are.
>> Then i stopped pyswitch module and ran routing module, then host1 still can
>> ping host2, and the UDP traffic test works well, almost all the packets are
>> transfered from host1 to host2.
>>
>> why this happened?
>>
>> Shan
>> _______________________________________________
>> nox-dev mailing list
>> nox-dev@noxrepo.org
>> http://noxrepo.org/mailman/listinfo/nox-dev
>
> _______________________________________________
> nox-dev mailing list
> nox-dev@noxrepo.org
> http://noxrepo.org/mailman/listinfo/nox-dev
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