Re: HELP !!! RP node failure ...( ctrmcast )

[Nader Salehi <salehi@isi.edu>]

There is also another problem.  You are not supposed to hard code your
multicast address.  Instead of assigning the address, i.e, 0x8000,
yourself, you should call;

set group [Node allocaddr]

Nader

Polly Huang wrote:

> On Tue, 15 Feb 2000, Vijayan Ramakrishnan wrote:
>
> >
> > Hi all
> >
> >   Suppose if I configured node1 & node2 as candidate-RPs
> >   for a group, say 0x8000 ( using CtrMcast model )
> >   ( in this case node2 would be the RP for this group )
> >
> >   If at some time t, there is a node failure for node2,
> >   will CtrMcast automatically choose node1 as RP and
> >   resume the multicast data forwarding ???
>
> no. node failure means the data couldn't reach the
> supposed core (called rp in cmcast). Unless a detailed dynamic core
> selection mechanism is implemented, you'll have to play with the
> candidate core (called c-rp) list instead.
>
> >
> >   ( I tried this scenario, but node2 wasn't choosen as RP
> >      and all the data was lost - is this expected behaviour ? )
>
> Yes.
>
> >
> >   I have attached the code.
> >   Also I get errors when i call the method manually
> >     ( _o162 unable to dispatch method "compute-mroutes" )
> >
> >   NOTE: compute-mroutes works in simple scenarios and there
> >         is no problem with installation.
>
> I ran your m5.tcl. This is what I got:
> >../../ns m5.tcl
> using backward compatible Agent/CBR; use Application/Traffic/CBR instead
> ns: _o162 compute_mroutes: _o162: unable to dispatch method
> compute_mroutes
>        ^
>     while executing
> "_o162 compute_mroutes"
>               ^
> As opposed in your email:
> ( _o162 unable to dispatch method "compute-mroutes" )
>                                           ^
>
> -Polly
> >
> >   ----------------------------------------------
> >   Any help is greatly appreciated !!!
> >   I am stuck with this problem for few days !!
> >   ----------------------------------------------
> >  - vijayan
> >