CBQ activation question

["Dr. Miroslav I. Klun" <mklun@gte.com>]

The network

           0                   4
            \                 /
             \               /
              2 ----------->3
             /               \
            /                 \
           1                   5

sends data traffic from node 0 to node 4 (flow 0),
and data traffic from node 1 to node 5 (flow 1).

The flows are specified by the usual

$source0 set fid_ 0
$source1 set fid_ 1

The link from 2 to 3 is simplex, specified by

$ns simplex-link $S $R 0.384Mb 2ms CBQ


All the other links are duplex, with DropTail queues.

However, running the ns on this file produces the following error message:

START time 0
ns: _o92 unknown-flow 0 196608 0 0:
    (_o92 cmd line 1)
    invoked from within
"_o92 cmd unknown-flow 0 196608 0 0"
    invoked from within
"catch "$self cmd $args" ret"
    (procedure "_o92" line 2)
    (SplitObject unknown line 2)
    invoked from within
"_o92 unknown-flow 0 196608 0 0"


On the other hand, replacing  CBQ  by any of one of  DropTail, FQ, SFQ,
DRR, or RED works properly!!!

It seems that I am missing something in trying to activate CBQ:  perhaps
typing a mere "CBQ" for type is not sufficient, the manual page instructions
notwithstanding.

Could anyone please give me a hint as to what might be the problem?

Thank you.

Miroslav I. Klun
Network Infrastructure Laboratory
GTE Labs
Waltham, MA
(781)466-3830