[ndnSIM] Setting up link metric

[Ahmed Sadek]

So when I use "FibHelper::AddRoute manually" this *will override* what
GlobalRoutingHelper
will calculate from the topology file.

On Fri, Feb 26, 2016 at 9:54 AM, Alex Afanasyev <aa at cs.ucla.edu> wrote:

> Hi Ahmed,
>
> There isn't a priority, these are different metrics used for different
> purposes.
>
> The one you configure in the topology file can be used by
> GlobalRoutingHelper to calculate routes and set up FIB entries.   What the
> helper does is obtains the configured costs, finds out (a set of) shortest
> paths, sums up the configured costs from the topology file, and calls
> FibHelper::AddRoute with the calculated cost.
>
> You can rub FibHelper::AddRoute manually (or in addition to
> GlobalRoutingHelper-generated calls to it).  Whichever cost you specify in
> AddRoute, will be assigned to FIB entry.   There is no relation to the
> configured cost in the topology.
>
> ---
> Alex
>
> > On Feb 20, 2016, at 2:58 AM, Ahmed Sadek <don1559 at gmail.com> wrote:
> >
> > Hi Spyridon ,
> >
> > Thank you for your reply. I still don't understand. If using the
> FibHelper I set the metric between client 1-> Router 1 to be 100 and in the
> topology file I set up the metric between client 1-> Router 1 to be 200, so
> which one takes effect and why ?
> >
> > Thanks!
> > Ahmed
> >
> > On Sat, Feb 20, 2016 at 4:49 AM, Spyridon (Spyros) Mastorakis <
> mastorakis at cs.ucla.edu> wrote:
> > Hi Ahmed,
> >
> > the first case refers to the establishment of a route that may be used
> for Interest forwarding. Specifically, the FibHelper will add the
> appropriate FIB entries on the routers across the specified path.
> >
> > The second case refers to the physical properties (bandwidth, delay,
> queue size) of a link between two adjacent nodes.
> >
> > Hope that this helps. Please let me know if you have any follow-up
> questions.
> >
> > Spyridon (Spyros) Mastorakis
> > Personal Website: http://cs.ucla.edu/~mastorakis/
> > Internet Research Laboratory
> > Computer Science Department
> > UCLA
> >
> >
> >
> >
> >> On Feb 16, 2016, at 3:48 AM, Ahmed Sadek <don1559 at gmail.com> wrote:
> >>
> >> Dear All,
> >>
> >> What is the difference between setting up the metric in the simulation
> file :
> >> ndn::FibHelper::AddRoute("client", "/", "router1", 150);
> >>
> >> Or in the topology file:
> >> # srcNode   dstNode     bandwidth   metric  delay   queue
> >> client      router1       20Mbps     150             50ms    50
> >>
> >> And which one take priority?
> >>
> >> Thanks!
> >> Ahmed
>
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