hi,

> I did a prototype for that by modifying the lldp app.

sounds like a good idea.

> 
> I did work as a proof of concept. One bad thing is that the measurements
> are not really reliable.
> 
> I've also seen papers of people doing the same thing with other controller
> so it should be possible. Just understand that make it reliable is a good
> challenge.

is your network silent otherwise?

YAMAMOTO Takashi

> 
> Flavio Castro Jr.
> MSCS student at Georgia Tech
> B.S.E in Networks Engineering from the University of Brasilia.
> CCNA Certified
> (404) 660-9373
> 
> On Fri, Mar 27, 2015 at 12:07 AM, YAMAMOTO Takashi <[email protected]>
> wrote:
> 
>> hi,
>>
>> afaik, there's no existing ryu apps which do that.
>>
>> just an idea:
>>
>> a. controller-switch latency can be measured using echo requests.
>> b. controller-switch-switch-controller latency can be measured using
>>    packet-out/in.
>>
>> (b - 2 * a) might be what you want.
>>
>> YAMAMOTO Takashi
>>
>> > Hi,
>> >
>> >
>> > I attempt to work at QoS experiment and Monitor the network resource in
>> RYU controller. However,I don't know how to measure the link delay in RYU.
>> Does RYU support to measure the delay for every link ? How should I do ?
>> >
>> >
>> > thanks
>>
>>
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