[ndnSIM] Regarding Forwarding Strategies Best Route and NCC

[Spyridon (Spyros) Mastorakis]

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 <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/ <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 <mailto: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 <mailto: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
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