back to article Arista wants to DANZ for high freaky traders

Arista Networks, the brainchild of serial entrepreneur Andy Bechtolsheim, is chasing a new market by reversing the polarity on its Ethernet switches, turning them into packet sniffers that feed into network analyzer equipment instead of packet shufflers. As is the case with most hardware these days, the trick is all in the …

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HFT is all about FPGA these days, don't see these cutting it

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Not there, James

Network taps. Latency isn't such a huge issue on the taps themselves: The every-microsecond-counts trades don't go through them in order to execute the trades. This stuff is used to analyse the trades after the event in order to better understand the nature of the traffic and thus how to fine-tune the rest of the network to shave off another infinitesimal slice of latency.

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Re: Not there, James

Indeed. You can use most enterprise switches as tap aggregators (by using VLANs (or QinQ VLANS) with MAC Learning disabled). Which is great of you don't need precision captures.

What makes these a bit special is the ability of the switch at add a timestamp shim to the packet so you can work our how many nanoseconds it spent in the switch. The hardware to do this is part of the switch ASIC and is required to support Precision Time Protocol (IEEE 1583).

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Re: Not there, James

Opps. IEEE 1588

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