Administrator Guide

Step Task Command Command Mode
All priorities that map to the same egress
queue must be in the same priority group.
Important Points to Remember
• If you remove a dot1p priority-to-priority group mapping from a DCB map (no priority pgid
command), the PFC and ETS parameters revert to their default values on the interfaces on which the
DCB map is applied. By default, PFC is not applied on specific 802.1p priorities; ETS assigns equal
bandwidth to each 802.1p priority.
As a result, PFC and lossless port queues are disabled on 802.1p priorities, and all priorities are
mapped to the same priority queue and equally share port bandwidth.
• To change the ETS bandwidth allocation configured for a priority group in a DCB map, do not modify
the existing DCB map configuration. Instead, create a new DCB map with the desired PFC and ETS
settings, and apply the new map to the interfaces to override the previous DCB map settings. Then,
delete the original dot1p priority-to-priority group mapping.
If you delete the dot1p priority-to-priority group mapping (no priority pgid command) before
you apply the new DCB map, the default PFC and ETS parameters are applied on the interfaces. This
change may create a DCB mismatch with peer DCB devices and interrupt the network operation.
Applying a DCB Map on Server-facing Ethernet Ports
You can apply a DCB map only on a physical Ethernet interface and can apply only one DCB map per
interface.
Step Task Command Command Mode
1
Enter CONFIGURATION mode on a server-
facing port or port channel to apply a DCB
map.
You cannot apply a DCB map on a port
channel. However, you can apply a DCB map
on the ports that are members of the port
channel.
interface
{
tengigabitEthernet
slot/port |
fortygigabitEthernet
slot/port}
CONFIGURATION
2
Apply the DCB map on an Ethernet port or
port channel. The port is configured with the
PFC and ETS settings in the DCB map, for
example:
Dell# interface tengigabitEthernet
0/0 Dell(config-if-te-0/0)# dcb-map
SAN_DCB1
Repeat this step to apply a DCB map to more
than one port or port channel.
dcb-map
name
INTERFACE
Creating an FCoE VLAN
Create a dedicated VLAN to send and receive Fibre Channel traffic over FCoE links between servers and a
fabric over an NPG. The NPG receives FCoE traffic and forwards decapsulated FC frames over FC links to
SAN switches in a specified fabric.
284
FC Flex IO Modules