Administrator Guide

Interworking of DCB Map With DCB Buer Threshold Settings
The dcb-input and dcb-output conguration commands are deprecated. You must use the dcp-map command to create a DCB map
to congure priority ow control (PFC) and enhanced transmission selection (ETS) on Ethernet ports that support converged Ethernet
trac.
Congure the dcb-buffer-threshold command and its related parameters only on ports with either auto conguration or dcb-map
conguration. This command is not supported on existing front-panel interfaces or stack ports that are congured with the dcb-input or
dcb-output commands. Similarly, if the dcb-buer-threshold conguration is present on a stack port or any interface, the dcb-input or
dcb-ouput policies cannot be applied on those interfaces.
Example: When the dcb-buer-threshold policy is applied on interfaces or stack ports with the dcb-input or dcb-output policies, the
following error message is displayed:
%Error: dcb-buffer-threshold not supported on interfaces with deprecated commands
Example: When the dcb-input or dcb-output policy is congured on interfaces or stack ports with the dcb-buer threshold policy, the
following error message is displayed:
%Error: Deprecated command is not supported on interfaces with dcb-buffer-threshold configured
You must not modify the service-class dot1p mappings when any buer-threshold-policy is congured on the system.
Dell(conf)#service-class dot1p-mapping dot1p0 3
% Error: PFC buffer-threshold policies conflict with dot1p mappings. Please remove all dcb-
buffer-threshold policies to change mappings.
The show dcb command has been enhanced to display the following additional buer-related information:
Dell(conf)#do show dcb
dcb Status : Enabled
PFC Queue Count : 2 --Indicate the PFC queue configured.
Total buffer (lossy + lossless)(in KB): 7787--Total buffer space for lossy and lossless queues
PFC total buffer (in KB): 6526 --Indicates the total buffer (configured or default)
PFC shared buffer (in KB): 832--Indicates the shared buffer (Configured or default)
PFC available buffer ( in KB): 5694--Indicates remaining available buffers for PFC that are
free to be allocated
Fibre Channel over Ethernet for FC Flex IO Modules
FCoE provides a converged Ethernet network that allows the combination of storage-area network (SAN) and LAN trac on a Layer 2 link
by encapsulating Fibre Channel data into Ethernet frames.
The Fibre Channel (FC) Flex IO module is supported on Dell Networking Operating System (OS) FN IOM. The FN IOM switch installed with
the FC Flex IO module functions as a top-of-rack edge switch that supports converged enhanced Ethernet (CEE) trac — Fibre channel
over Ethernet (FCoE) for storage, Interprocess Communication (IPC) for servers, and Ethernet local area network (LAN) (IP cloud) for
data — as well as FC links to one or more storage area network (SAN) fabrics.
FCoE works with the Ethernet enhancements provided in Data Center Bridging (DCB) to support lossless (no-drop) SAN and LAN trac.
In addition, DCB provides exible bandwidth sharing for dierent trac types, such as LAN and SAN, according to 802.1p priority classes of
service. DCBx should be enabled on the system before the FIP snooping feature is enabled.
All of the commands that are supported for FCoE on the FN IOM apply to the FC Flex IO modules. Similarly, all of the conguration
procedures and the settings that are applicable for FCoE on the FN IOM are valid for the FC Flex IO modules.
FC Flex IO Modules
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