[ndnSIM] Calculate metric for a prefix

Spyridon (Spyros) Mastorakis mastorakis at CS.UCLA.EDU
Mon May 23 18:53:20 PDT 2016

Hi Sabet,

the cost has to do with the overall routing/forwarding administration and policies. I do not think that we have a standardized way to calculated the cost for the next hop of a FIB entry. If you think about it, the adaptive forwarding plane and the forwarding strategy can override the routing plane, set/reset the cost for each next hop and change the face ranking on each node.

To access the cost, you will have to access the FIB of a node and then use the FIB look up API:


The highlighted methods will return a shared_ptr to a fib entry. Then you can use the fib entry API to get the next-hops for this fib entry:


Finally, you will use the next-hop API to get the cost of each next hop:


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

> On May 22, 2016, at 6:17 AM, Muhammad Hosain Abdollahi Sabet <mhasabet at gmail.com> wrote:
> Hi everyone,
> In my custom application, based on the received interest I want to create a FIB entry for a prefix - which is retrieved by processing the interest's name. For using FIBHelper::AddRoute in need to have the metric for prefix. How can I calculate it? Is there any method some where which you(in a node) can give it prefix and it gives you back the metric for that prefix?
> Thanks,
> Sabet

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