Re: Multicast Questions

[Polly Huang <huang@tik.ee.ethz.ch>]

On Sat, 27 Sep 2008, jamester wrote:

> Hello.
> 
> My first question :
> 
> 	It seems like "$ns set-address-format expanded" and multicast
> 	do not go together.  When I use expanded address I get errors similar to "_o57:
> 	no target for slot 128".  This error occurs when I generate only 100 nodes with
> 	expanded address format, but not without expanded address format.  Anyone knows
> 	anything about this?
> 
> My second question :
> 	Is there any way I can see routes from source to destination nodes in
> 	multicast?  I tried following :
> 
> 	set mproto DM
>            	set mrthandle [$ns mrtproto $mproto {}]
>            	........
>            	$ns join-group receiver_agent group            
> 	$ns get-mcast-tree $node($src) $group #src is srouce node id
> 
> 	I do not get multicast tree but following error messages.
> 	
> 	ns: _o3 get-mcast-tree _o53 0x8002]: can't read "GROUP_": no such variable
                                    ^^^^^^ 
James,

0x8002 is considerred a unicast address when used with 'expanded'
addressing.  It is recommended to use 'Node allocaddr' instead of manually
configuring mcast addresses (unless you know the address format very
well).  

Cheers,
-Polly

>     	while executing
> 	"error "No replicator for $GROUP_ at [$src id]""
>     	(procedure "_o3" line 7)
>     	(Simulator get-mcast-tree line 7)
>     	invoked from within
> 	"_o3 get-mcast-tree _o53 0x8002]"
> 
> Any help is greatly appreciated.
> Thanks in advance.
> 
> -James Kwon
> 	
> 
> 
>