Arista 7150S switch latency
The Arista 7150S-24S(C) entry lists 350 ns, while the 7150S-64/52S(C) entry lists 380 ns. See the Arista 7150S latency comparison for both models, units and the manufacturer datasheet.
Cisco Nexus 3550 and Arista 713x modes
The minimum Layer 1 figure does not describe every mode on a programmable switch. Compare Cisco’s Layer 1, FastMux, Layer 2 and Layer 3 paths on the Nexus 3550 latency page. For the Arista 7130, 7132 and 7135 Layer 1 and application figures, use the 713x versus 3550 comparison.
How to compare device latency
Manufacturer figures often describe a minimum under specific test conditions. Layer 1 switching, packet forwarding and firewall processing perform different work, so compare the specification notes as well as the number. Packet size, forwarding mode, transceivers and queuing can change the result.
These are the estimates used by the calculator. Where a source gives a range, threshold or alternative configuration, the notes provide that context. Check the linked documentation for your configuration and validate important designs with measurements of the actual network.
Build a complete path estimate
Use the network latency calculator to combine devices and links. For propagation over standard or hollow-core fiber, use the fiber latency calculator. Read more about our methodology and sources.