Re: parameters for ns_create_cbr

[Sally Floyd <floyd@ee.lbl.gov>]

>	Can anybody tell me what is the last parameter for the 
>	ns_create_cbr ?

The last parameter is the flow id.  In the CBQ test scripts in
ns-2/tcl/test, "ns_create_cbr" is only used in the ns version 1 test
scripts test-suite-cbq-v1.tcl and test-suite-cbq-v1a.tcl, and not in
the ns version 2 test script test-suite-cbq.tcl.

That is, "ns_create_cbr" is only included for backward compatibility
mode, so that users can run ns version 1 scripts in ns -2.  In ns-2
without backward compatibility mode, the binding of flows to CBQ
classes is done as follows, as shown in test-suite-cbq.tcl:

        $cbqlink bind $audioclass_ 1;# fid 1

- Sally

Details:

The procedure "ns_create_cbr" is in ns-2/tcl/lib/ns-compat.tcl:

proc ns_create_cbr { srcNode sinkNode pktSize interval fid } {
        set s [ns create-connection cbr $srcNode loss-monitor \
                $sinkNode $fid]

The last parameter, the "flow id", is used by "create-connection" in
ns-lib.tcl as follows:

Simulator instproc create-connection {s_type source d_type dest pktClass} {
...
        $s_agent set fid_ $pktClass
        $d_agent set fid_ $pktClass

Defined in ns-2/agent.h as follows:

        int fid_;               /* for IPv6 flow id field */

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