[ns] How to measure the queue length at a node?

[zhilin su <su_zl@yahoo.com>]

Hi, all,

I am new to NS. But I have a simple question as
follows:

I built a topology with 3 nodes as a line. Then I
attached a UDP agent with a Expoo traffic generator to
one end of it and a Null sink to the other. When the
network running, how can I measure the queue length at
the middle node? Thanks

Zhilin Su

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