Dynamic unicast routing protocol

[Shuqian Yan]

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Hello all,

I modified the example file  ~ns/tcl/ex/newmcast/mcast5.tcl by adding an
extra line $ns rtproto DV, because I want to use the dynamic unicast
routing protocol as the underlying unicast routing protocol. But when I
execute the above script, it failed with the following error messages,

At 0.0000 : node 0 BST: grp 32771, node 0
At 0.0000 : node 1 BST: grp 32771, node 1
At 0.0000 : node 2 BST: grp 32771, node 2
At 0.0000 : node 3 BST: grp 32771, node 3
ns: _o3 run-mcast: can't read "Node_(-1)": no such element in array
    while executing
"set Node_($id)"
    (procedure "_o3" line 3)
    (Simulator get-node-by-id line 3)
    invoked from within
"$ns_ get-node-by-id [[$ns_ get-routelogic] lookup $id_ $srcID]"
    (procedure "_o77" line 6)
    (Node rpf-nbr line 6)
    invoked from within
"$self rpf-nbr $node"
    (procedure "_o77" line 6)
    (Node from-node-iface line 6)
    invoked from within
"$node_ from-node-iface $RP_($grp)"
    (procedure "_o461" line 12)
    (BST start line 12)
    invoked from within
"_o461 start"
    ("eval" body line 1)
    invoked from within
"eval $p $op $args"
    (procedure "_o81" line 7)
    (mrtObject all-mprotos line 7)
    invoked from within
"$self all-mprotos start        "
    (procedure "_o81" line 1)
    (mrtObject start line 1)
    invoked from within
"$mrtObject_ start"
    (procedure "_o77" line 3)
    (Node start-mcast line 3)
    invoked from within
"$node start-mcast"
    (procedure "_o3" line 5)
    (Simulator run-mcast line 5)
    invoked from within
"_o3 run-mcast"

I couldn't get where the error came from, it seems to me the lookup{}
procedure return a -1 such that when $ns get-node-by-id -1, it surely
can't locate Node_(-1) in the Node_ array.  

Could someone help to take a look at the problem? I also enclosed the
modified version of mcast5.tcl.

thank you,

shuqian yan

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