Dell PowerEdge FX2/FX2s - Manual (Page 30)

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. Configure 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.
Configure priority to priority group mapping from priority 0 to priority 7 in order.
4. Exit the DCB MAP configuration mode.
DCB-MAP mode
exit
5. Enter interface configuration mode.
CONFIGURATION mode
interface type slot/port
6. Apply the dcb-map with PFC and ETS configurations to both ingress and egress interfaces.
INTERFACE mode
dcb-map map-name
7. Repeat steps 1 to 6 on all PFC and ETS enabled interfaces to ensure lossless traffic service.
NOTE: All these configurations are available only in PMUX mode and you cannot perform these
configurations in Standalone mode.
Dell Networking OS Behavior: As soon as you apply a DCB MAPwith PFC enabled on an interface, DCBx
starts exchanging information with PFC-enabled peers. The IEEE802.1Qbb, CEE, and CIN versions of PFC
Type, Length, Value (TLV) are supported. DCBx also validates PFC configurations that are received in TLVs
from peer devices.
By applying a DCB MAP with PFC enabled, you enable PFC operation on ingress port traffic. To achieve
complete lossless handling of traffic, also enable PFC on all DCB egress ports or configure the dot1p
priority-queue assignment of PFC priorities to lossless queues.
To remove a DCB MAP, including the PFC and ETS configurations it contains, use the no dcb-map map-
name command in INTERFACE Configuration mode.
You can enable any number of 802.1p priorities for PFC. Queues to which PFC priority traffic is mapped
are lossless by default. Traffic may be interrupted due to an interface flap (going down and coming up)
when you reconfigure the lossless queues for no-drop priorities in a PFC dcb-map and reapply the policy
to an interface.
To apply PFC, a PFC peer must support the configured priority traffic (as detected by DCBx).
To honor a PFC pause frame multiplied by the number of PFC-enabled ingress ports, the minimum link
delay must be greater than the round-trip transmission time the peer requres.
If you apply dcb-map with PFC disabled (no pfc mode on):
30 Data Center Bridging (DCB)