Deployment Guide

1 Globally enable auto-detection of DCBx and auto-enabling of DCB on all interfaces after switch reload.
CONFIGURATION mode
dcb enable auto-detect on-next-reload
Enabling DCB To congure the Aggregator so that all interfaces are DCB enabled and ow control disabled, use the dcb enable
command.
Disabling DCB To congure the Aggregator so that all interfaces are DCB disabled and ow control enabled, use the no dcb enable
command.
dcb enable auto-detect on-next-reload Command Example
Dell#dcb enable auto-detect on-next-reload
Conguring Priority-Based Flow Control
PFC provides a ow control mechanism based on the 802.1p priorities in converged Ethernet trac received on an interface and is enabled
by default when you enable DCB.
As an enhancement to the existing Ethernet pause mechanism, PFC stops trac transmission for specied priorities (Class of Service
(CoS) values) without impacting other priority classes. Dierent trac types are assigned to dierent priority classes.
When trac congestion occurs, PFC sends a pause frame to a peer device with the CoS priority values of the trac that is to be stopped.
Data Center Bridging Exchange protocol (DCBx) provides the link-level exchange of PFC parameters between peer devices. PFC allows
network administrators to create zero-loss links for Storage Area Network (SAN) trac that requires no-drop service, while retaining
packet-drop congestion management for Local Area Network (LAN) trac.
To ensure complete no-drop service, apply the same dcb-map on all PFC and ETS enabled interfaces.
1 Create a DCB map to apply priority based ow control or enhanced transmission selection for specied priority groups and priorities.
CONFIGURATION mode
dcb-map map-name
The maximum is 32 alphanumeric characters.
2 Congure the priority group with PGID, bandwidth percentage or strict priority for ETS and PFC mode.
DCB-MAP mode
priority-group pg_num [bandwidth percentage | strict-priority] pfc [on | off]
pg_num range is from 0 to 7.
bandwidth percentage range is from 1 to 100.
Either strict-priority or bandwidth percentage can be set for ETS on the priority group.
PFC can either be enabled or disabled for the priority group.
3 Congure the priorities to priority group.
DCB-MAP mode
priority-pgid <pgid> <pgid> <pgid> <pgid> <pgid> <pgid> <pgid> <pgid>
pgid range is from 0 to 7.
Congure priority to priority group mapping from priority 0 to priority 7 in order.
4 Exit the DCB MAP conguration mode.
Data Center Bridging (DCB)
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