Note that the 93180YC-EX is a 48-port hardware configuration even if ordered as 24-port SKU. In terms of basic functionality the biggest advantage of NX-OS to me is vPC (virtual port-channel) since it's a form of cross-switch link aggregation that doesn't depend on a shared control plane but if you're looking at a single switch then it won't really matter that much. Still the Nexus will likely show better performance for latency-sensitive traffic flows like iSCSI (thought I've never done a comparison myself). It is a store-and-forward architecture just like the 9500 and not considered a "ultra low latency" switch. The switch latency for the 93180 is advertised as sub-microsecond but in some data sheets lists latency to be an average of 2.5 microseconds. The UADP 3.0 has a 36MB packet buffer with one ASIC used for the 9500-24Y4C or 9300-48Y4C.Īverage switch latency for the 9500 was measured at 3.33 to 5.17 microseconds. The 93180YC-EX makes use of one LSE ASIC. The LSE has 18.7MB of buffering per slice (two slices per ASIC) for a total of 37.4MB. The Catalyst 9500 makes use of UADP 3.0 ASIC while Nexus 9300 EX makes use of the LSE (leaf-and-spine engine) ASIC. In addition to NX-OS the Nexus 9300 also supports the ACI image (controller based SDN alterative) VXLAN configuration is robust in NX-OS than IOS XE if you have a need for it. Things like vPC and support for FCoE are NX-OS exclusive features for example (note FCoE and MACSEC are only available using the more expensive FX line instead of EX). IOS XE and NX-OS support sine different features. That said if you're looking at creating a data center environment that will leverage things like VXLAN or automation then the Nexus line will be the most common, most supported, and most widely adopted solution. If you're not experienced with NX-OS and are more comfortable sticking with IOS XE the Catalyst 9000 series can be a safe choice for small server switch needs. Nexus models used to have considerable performance advantages over the Catalyst but the Catalyst 9000 series has closed the gap considerably. The Catalyst line is focused on campus networking (core access and distribution). The Nexus line is dedicated to data center needs and that is where the development focus is.
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