Users Guide

Enabling Fibre Channel Capability on the Switch
Enable the Fibre Channel capability on an Aggregator that you want to configure as an NPG for the Fibre Channel protocol. When you
enable Fibre Channel capability, FCoE transit with FIP snooping is automatically enabled on all VLANs on the switch, using the default
FCoE transit settings.
1 Enable the Fibre Channel capability on an Aggregator for the Fibre Channel protocol.
CONFIGURATION mode
feature fc
Creating a DCB Map
Configure the priority-based flow control (PFC) and enhanced traffic selection (ETS) settings in a DCB map before you apply them on
downstream server-facing ports on an Aggregator.
1 Create a DCB map to specify PFC and ETS settings for groups of dot1p priorities.
CONFIGURATION mode
dcb-map name
2 Configure the PFC setting (on or off) and the ETS bandwidth percentage allocated to traffic in each priority group. Configure
whether the priority group traffic should be handled with strict-priority scheduling. The sum of all allocated bandwidth percentages
must be 100 percent. Strict-priority traffic is serviced first. Afterward, bandwidth allocated to other priority groups is made available
and allocated according to the specified percentages. If a priority group does not use its allocated bandwidth, the unused bandwidth
is made available to other priority groups.
Restriction: You can enable PFC on a maximum of two priority queues.
Repeat this step to configure PFC and ETS traffic handling for each priority group, for example: priority-group 0 bandwidth
60 pfc off
priority-group 1 bandwidth 20 pfc onpriority-group 2 bandwidth 20 pfc on priority-
group 4 strict-priority pfc off
DCB MAP mode
priority-group group_num {bandwidth percentage | strict-priority} pfc {on | off}
3 Specify the priority group ID number to handle VLAN traffic for each dot1p class-of-service: 0 through 7. Leave a space between
each priority group number. For example, priority-pgid 0 0 0 1 2 4 4 4 where dot1p priorities 0, 1, and 2 are mapped to
priority group 0; dot1p priority 3 is mapped to priority group 1; dot1p priority 4 is mapped to priority group 2; dot1p priorities 5, 6, and 7
are mapped to priority group 4.
All priorities that map to the same egress queue must be in the same priority group.
DCB MAP mode
priority-pgid dot1p0_group_num dot1p1_group_num dot1p2_group_num dot1p3_group_num
dot1p4_group_num dot1p5_group_num dot1p6_group_num dot1p7_group_num
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.
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