[ndnSIM] Regarding Forwarding Strategies Best Route and NCC

[Ahmed Sadek]

Hi Spyros,

Thank you for your reply. Honestly, I have checked the developer guide
before asking and this is what I found on NSS Strategy:
6.2.4 NCC Strategy The NCC strategy 8 is an reimplementation of CCNx 0.7.2
default strategy [16]. It has similar algorithm but is not guaranteed to be
equivalent. This strategy is implemented as nfd::NccStrategy class.

And the citation lead to the same website provided above  , which I have
check and didn't understand how it measures delay for each interface.

Now I am checking the code here "
https://github.com/0xbb/amus-ndnSIM/blob/master/NFD/daemon/fw/ncc-strategy.cpp
"

If anyone can give few words explaining this strategy, I would be thankful.

Thanks!
Ahmed

On Fri, Jan 29, 2016 at 6:11 PM, Spyridon (Spyros) Mastorakis <
mastorakis at cs.ucla.edu> wrote:

> Hi Ahmed,
>
> it would be a good idea to take a look at the NFD developer’s guide as
> well. There is a section describing each strategy:
>
>
> http://named-data.net/wp-content/uploads/2015/10/ndn-0021-5-nfd-developer-guide.pdf
>
> Hope that this helps.
>
> Spyridon (Spyros) Mastorakis
> Personal Website: http://cs.ucla.edu/~mastorakis/
> Internet Research Laboratory
> Computer Science Department
> UCLA
>
>
>
>
> On Jan 29, 2016, at 1:39 AM, Ahmed Sadek <don1559 at gmail.com> wrote:
>
> Hi Junxiao,
>
> Thank you for your reply.
>
> What routing metrics to use is an unsolved problem
> <http://redmine.named-data.net/issues/2010>.
> NDN testbed is using round-trip time (in milliseconds) measured by IP ping
> as its routing metrics.
>
> *So hop count is not used as a metric ?*
>
> See CcndStrategy
> <http://redmine.named-data.net/projects/nfd/wiki/CcndStrategy> for
> information on NCC strategy.
>
> *I read it before sending the question and didn't understand it, how NCC
> is measuring delay on interfaces and selecting the lowest delay ? Is it
> sending IP ping messages broadcast flood on each interface each few seconds
> and ranking the interfaces based on this values ? and does it take prefix
> into account or only interfaces ?*
>
> Thanks!
> Ahmed
>
> On Thu, Jan 28, 2016 at 9:47 PM, Junxiao Shi <shijunxiao at email.arizona.edu
> > wrote:
>
>> Hi Ahmed
>>
>> What routing metrics to use is an unsolved problem
>> <http://redmine.named-data.net/issues/2010>.
>> NDN testbed is using round-trip time (in milliseconds) measured by IP
>> ping as its routing metrics.
>>
>> See CcndStrategy
>> <http://redmine.named-data.net/projects/nfd/wiki/CcndStrategy> for
>> information on NCC strategy.
>>
>> Yours, Junxiao
>>
>> On Jan 28, 2016, at 9:00 AM, Ahmed Sadek <don1559 at gmail.com> wrote:
>>
>> Dear All,
>>
>> I am trying to understand better the two strategies of best route and
>> NCC. My understanding is:
>>
>> BestRoute: This strategy relies on routing information and forwards
>> Interests on the path with the lowest costs considering a specific metric.
>> So I was wondering what routing metrics options we can consider for this
>> strategy ?
>>
>> NCC: Interests are forwarded to the interface, that provides content with
>> the lowest delay.
>> So how is the delay is measured here on a low level for each interface?
>> and is it measured for each prefix for each interface or only for each
>> interface ?
>>
>> I really appreciate any explanation or if you point me to a link
>> explaining it.
>>
>> Thanks !
>>
>> Ahmed Sadek
>> _______________________________________________
>> ndnSIM mailing list
>> ndnSIM at lists.cs.ucla.edu
>> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
>>
>>
>>
> _______________________________________________
> ndnSIM mailing list
> ndnSIM at lists.cs.ucla.edu
> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.lists.cs.ucla.edu/pipermail/ndnsim/attachments/20160129/f71afd8a/attachment.html>