[ns] Having problems with CBQ and packet drops using CBR

["Alvaro Armenta" <aarmenta@cicese.mx>]

Hi all,
I have a 100Mbps link with a CBQ queue. I defined two classes in CBQ:

a CBR class with 0.50 bw allocation
and TCP class with 0.40 BW allocation

I created 50 CBR (with 64 bytes packets) traffic sources at 1.5Mbps each.

If i'm not wrong, the CBQ bw allocation for the CBR traffic would be
50 Mbps (50% of the available BW), i'm correct?
This will give me that at least 30 flows (44 Mbps of bw) of CBR without
packet drops,
the strange thing is that i'm having packet drops starting at the 21 flow.
The
TCP traffic is turned off.

I try the same simulation with a FIFO queue and i didn't have any packet
drops
for the 50 flows.

Does any one have any explanation or solution for this problem?

Thanks

Ing. Alvaro Armenta Ramade
(Sorry about my english, but is not my native language!)
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Departamento de Comunicaci�n - Direcci�n de Vinculaci�n
Centro de Investigaci�n Cient�fica y de Educaci�n Superior de Ensenada
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