Setup Guide

Table Of Contents
The following example shows DCB buffer values after one PFC lossless queue configured on a port that belongs to ingress pipe 0 [10G
speed]:
DellEMC#
DellEMC#show dcb
DCB Status: Enabled, PFC Queue Count: 2
Total Buffer: Total available buffer excluding the buffer pre-allocated
for guaranteed services like global headroom, queue's min
guaranteed buffer and CPU queues.
PFC Total Buffer: Maximum buffer available for lossless queues.
PFC Shared Buffer: Buffer used by ingress priority groups for shared usage.
PFC Headroom Buffer: Buffer used by ingress priority group for shared headroom usage.
PFC Available Buffer: Current buffer available for new lossless queues to be
Provisioned.
stack-unit Total Buffer PFC Total Buffer PFC Shared Buffer PFC Headroom Buffer PFC Available
Buffer
PP (KB) (KB) (KB)
(KB) (KB)
----------------------------------------------------------------------------------------------
-------
1 0.0 3399 2656 1040 1040 567
1 0.1 3399 2656 1040 1040 576
1 0.2 3399 2656 1040 1040 567
1 0.3 3399 2656 1040 1040 576
DellEMC#
Following table shows the XPE numbering scheme in Dell EMC Networking OS:
Table 18. XPE Numbering on Dell EMC Networking OS
XPE Numbering
XPE A of MMU Slice R 0.0
XPE A of MMU Slice S 0.1
XPE B of MMU Slice R 0.2
XPE B of MMU Slice S 0.3
Enabling Data Center Bridging
DCB is automatically configured when you configure FCoE.
Data center bridging supports converged enhanced Ethernet (CEE) in a data center network. DCB is disabled by default. It must be
enabled to support CEE.
Priority-based flow control
Enhanced transmission selection
Data center bridging exchange protocol
FCoE initialization protocol (FIP) snooping
DCB processes virtual local area network (VLAN)-tagged packets and dot1p priority values. Untagged packets are treated with a dot1p
priority of 0.
For DCB to operate effectively, you can classify ingress traffic according to its dot1p priority so that it maps to different data queues. The
dot1p-queue assignments used are shown in the following table.
To enable DCB, enable the FCoE configuration.
NOTE:
Dell EMC Networking OS Behavior: DCB is not supported if you enable link-level flow control on one or more
interfaces. For more information, refer to Ethernet Pause Frames.
Data Center Bridging (DCB) 239