Nx-os And Cisco Nexus Switching- Next-generation Data Center Architectures -repost- • Working

class-map type qos match-any ROCE
  match cos 3
policy-map type qos ROCE_POLICY
  class ROCE
    set qos-group 3
class-map type queuing ROCE_OUT
  match qos-group 3
policy-map type queuing ETS_POLICY
  class ROCE_OUT
    priority level 1
    bandwidth percent 50
    pause no-drop

To understand the future, we must look at the past. Legacy Cisco switches ran IOS (Internetwork Operating System), which excelled in enterprise campus environments but struggled with data center scale. In the mid-2000s, Cisco acquired Andiamo Systems, leading to the birth of the MDS SAN switches and later the Nexus line.

NX-OS was built from the ground up with a different philosophy: class-map type qos match-any ROCE match cos 3

Today, NX-OS powers everything from the compact Nexus 3000 series to the chassis-based 7000 and 9000 families. To understand the future, we must look at the past

The 9500 series (e.g., 9516 chassis) is for the true mega-spine. It can handle up to 172 Tbps of switching capacity and supports 400GbE optics. If you are running AI/ML clusters or massive public cloud-like infrastructure, this is the chassis. Today, NX-OS powers everything from the compact Nexus