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Choosing an Aggregator TAP buffer size

Chapter 4 Aggregator TAPs

rev. 1

To monitor links that are well over 50% utilization for minutes at a

time, a full-duplex TAP may be a better choice.

After the buffer is full, an Aggregator TAP will drop packets. Use

Figure 9 to choose the best buffer size for your Aggregator TAP. The

graph shows the buffer size and duration of traffic spikes that the

buffer can absorb.

OTE: LINK SPEEDS

The Link side and Analyzer side of the Aggregator TAP

negotiate their connections independent of each other. This

means that the Link/network side can be at a speed slower

than or up to the same speed as the Analyzer side. It cannot

be faster than the Analyzer side. This is true whether you use

a copper or optical connection to the analyzer.

For instance, if your Link/network side is at 10 Mb or 100 Mb

and your analyzer connection is 1 Gb, the TAP sends data to

the analyzer at 1 Gb, known as up-converting, and there is no

chance of over-subscribing the buffer.

If your Link/network side is 1 Gb, then your connection to

the analyzer must also be 1 Gb. It cannot be 10 Mb or 100

Mb, because the analyzer cannot receive the traffic from the

Link side fast enough.

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Black Box TS255A Spécifications Page 44