What's the usage of `Data center bridging`?

Question

show dcb app
show clock
Privileged Mode
#
Displays DCB (Data center bridging) application data.
Command Syntax
Command Modes Syntax Description
Command Default Examples
show dcb app {local status|map}|{remote status|map}|status|map
This command has no default settings.
#show clock
05:59:29.770072 None 2000-01-02
1.0.1
Privileged Mode
#
local
remote
status
map
This command has no default settings.
#show dcb app map
#show dcb app status
#show dcb app local map

in a SuperMicro MBM-XEM, there is dcb concept, what's the meaning of it?

Answer 1

This link can explain it better than we can:

Data Center Bridging (DCB) is a collection of IEEE specified standard extensions to Ethernet to provide lossless data delivery, low latency, and standards-based bandwidth sharing of data center physical links. DCB supports storage, management, computing, and communications fabrics onto a single physical fabric that is simpler to deploy, upgrade, and maintain than in standard Ethernet networks. DCB has a standards-based bandwidth sharing at its core, allowing multiple fabrics to coexist on the same physical fabric. The various capabilities of DCB allow for LAN traffic (large number of flows and not latency-sensitive), SAN traffic (large packet sizes and requires lossless performance), and IPC (latency-sensitive messages) to bandwidth share the same physical converged connection and achieve the desired individual traffic performance.

DCB includes the following capabilities:

Enhanced Transmission Selection (ETS)

Priority-based Flow Control (PFC)

Data Center Bridging Capability eXchange Protocol (DCBX)