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On October 5th I posted part 1 of the Algo Boost series with a fantastic discussion around the latency innovations on the Nexus 3548. Today, we announced that these units are now shipping to customers and the much anticipated wait is over to get this game changing technology! This is perfect timing as I introduce part 2 of the series with Errol Roberts, Distinguished System Engineer for the top Data Center accounts, to bring a customer perspective to the ultra-low latency Nexus 3548 in a High Performance Trading fabric.

[GD]  I know that you spend a lot of your time talking with customers. What are our Financial Services customers telling you about their environments and requirements?

[ER] When meeting with these customers, I like to ask a single question -- “What value can an infrastructure company provide to high-performance trading workloads”.  Key points relating to the switching are captured by the following:

[GD] Can you elaborate a little more on microbursts? What is unique in how the Nexus 3548 handles them?

[ER]: Microbursts are a problem for firms when there is a spike in data network traffic that overwhelms the buffer capacity of the network. In trading environments, these spikes typically occur during times of high volatility such as market open or market close, or when a specific news event occurs in the world. When trading systems are overwhelmed they typically drop or delay the flow of packets going through them. Since today’s trades are measured in nanoseconds, dropped or delayed packets have the potential to cost organizations a lot of money.

The industry leading Cisco Nexus 3548 has a large 18MB buffer along with a toolset to provide real-time performance visibility monitoring to identify bursts at the nanosecond level; which could potentially compromise system performance.

[GD] From a customer point of view, how do you see WARP Mode, SPAN and WARP SPAN features to be utilized in the High Frequency Trading environments?

[ER]: This is a great question. Let’s take the example of a trading firm. The trading firm is connecting to multiple exchanges and receives exchange feeds for the trading premises they provide services to the traders and brokerage clients. In this type of design, as depicted on the diagram bellow; the exchange feed provides the market data information to the trading firm. The network infrastructure and feed handlers can be collocated in the exchange location itself, in order to receive the information as quickly as possible, this is the reason why ultra low latency is key. At the same time in this example, you can see that we have a single tier network collapsed design, where the Nexus 3548 is acting as an L3 device to peer with the exchange for the market data feed while also supporting L2 for all the local feed handlers connecting to it. With the Nexus 3548 enabled in warp span mode, the traffic from the market data feed is replicated and sent downstream to the feed handlers at 50 nanoseconds (ns). At the same time the order execution devices will send an order upstream to the exchange leveraging the warp mode, which provides latency as low as 190 ns. In this type of deployment, you can see that a customer can benefit from a 50ns latency down to the feed handlers and 190 ns upstream for the order execution. It’s important to understand that the same device can have the warp mode enabled as well as the warp span mode, reducing one more time the amount of network infrastructure required to achieve an ultra low latency end to end. In the colocation example, monitoring the traffic going through the trading firm provides a guarantee of delivery as well as a possibility to replay market data traffic. This is achieved with the SPAN functionality of the Nexus 3548. The switch is capable to provide:

One interesting customer use case is to use the Nexus 3548 for a remote span destination with multiple traffic analyzers connected on multiple ports, as illustrated on the picture bellow.


I’d like to thank Errol for his customer insights. To get more info on the Nexus 3548, visit

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