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iTap GigaBit Dual Port Aggregator
5
The NIC receives 800 Mbps (80% utilization), so no memory is required for the
monitoring device's NIC to process all full-duplex traffi c.
If there is burst of traffi c on Side A of 900 Mbps and Side B remains at 500 Mbps,
the aggregated traffi c equals 1400 Mbps, 400 Mbps over the capacity of the NIC.
The excess traffi c is put in memory on a fi rst-in-fi rst-out basis until either the buf-
fer is full or the burst passes.
Figure 2: Side A plus Side B becomes greater than 100% of the NIC’s receive
capacity
After the burst has passed and the buffers have passed all the stored traffi c, each
monitoring device resumes receiving traffi c directly from the link.
Note: ____________________________________________________________________
Utilization statistics and alarms are monitored before buffering and aggregation.
__________________________________________________________________________
FirewallRouter
Monitoring
Device 1
iTap GigaBit Dual
Port Aggregator Tap
Monitoring
Device 2
Side B
Side A
Side A +
Side B
The extra 400 Mbps of traffic
is stored in buffer memory.
Memory continues to fill until
capacity is reached, or the
burst ends.
2
Memory
B
12
A
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RESET
Network
Monitor
1
2
B
A
Dual Port Aggregator
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