Concept Guide

Enabling Fibre Channel Capability on the Switch
Enable the FC Flex IO module on the FN IOM that you want to congure 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 FN IOM with the FC Flex IO module for the Fibre Channel protocol.
CONFIGURATION mode
feature fc
Creating a DCB Map
Congure the priority-based ow control (PFC) and enhanced trac selection (ETS) settings in a DCB map before you apply them on
downstream server-facing ports on the FN IOM with the FC Flex IO module.
1 Create a DCB map to specify PFC and ETS settings for groups of dot1p priorities.
CONFIGURATION mode
dcb-map name
2 Congure the PFC setting (on or o) and the ETS bandwidth percentage allocated to trac in each priority group. Congure whether
the priority group trac should be handled with strict-priority scheduling. The sum of all allocated bandwidth percentages must be
100 percent. Strict-priority trac is serviced rst. Afterward, bandwidth allocated to other priority groups is made available and
allocated according to the specied 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 congure PFC and ETS trac 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 | o}
3 Specify the priority group ID number to handle VLAN trac 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 specic
802.1p priorities; ETS assigns equal bandwidth to each 802.1p priority.
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FC Flex IO Modules