Dcb Maps And Its Attributes; Dcb Map: Configuration Procedure - Dell C9000 Series Networking Configuration Manual

• fpIngPgBuffSnapshotTable
• fpStatsPerPgTable
• pfcPerPrioTable
fpEgrQBuffSnapsh This table fetches the BST statistics at Egress Port with respect to the buffer used. This
otTable table displays the Snapshot of the Buffer cells used by Unicast and Multicast Data and
Control Queues.
fpIngPgBuffSnapsh This table fetches the BST statistics at the Ingress Port with respect to the Shared Cells
otTable and the Headroom cells used per Priority Group. The snapshot of the Ingress Shared
cells used and the Ingress Headroom cells used per Priority Group, when PFC is
enabled, will be displayed in this table. This table is indexed by stack-unit index, port
number and the priority group number.
fpStatsPerPgTable This table fetches the Allocated Min cells, Shared cells and Headroom cells per Priority
Group, the mode in which the buffer cells are allocated - Static or Dynamic and the
Used Min Cells, Shared cells and Headroom cells per Priority Group. The table fetches a
value of 0 if the mode of allocation is Static and a value of 1 if the mode of allocation is
Dynamic. This table is indexed by stack-unit number, port number and priority group
number.
pfcPerPrioTable This table fetches the number of PFC frames transmitted (PFC Requests) and the
number of PFC frames received (PFC Indications) per priority on a per port basis. This
table is indexed by the stack-unit index, port number and priority.

DCB Maps and its Attributes

This topic contains the following sections that describe how to configure a DCB map, apply the configured
DCB map to a port, configure PFC without a DCB map, and configure lossless queues.

DCB Map: Configuration Procedure

A DCB map consists of PFC and ETS parameters. By default, PFC is not enabled on any 802.1p priority and
ETS allocates equal bandwidth to each priority. To configure user-defined PFC and ETS settings, you must
create a DCB map. The following is an overview of the steps involved in configuring DCB.
1 Enter global configuration mode to create a DCB map or edit PFC and ETS settings.
2 Configure the PFC setting (on or off) and the ETS bandwidth percentage allocated to traffic in each
priority group, or whether the priority group traffic should be handled with strict priority scheduling. You
can enable PFC on a maximum of 4 priority queues on an interface. Enabling PFC for dot1p priorities
makes the corresponding port queue lossless. The sum of all allocated bandwidth percentages in all
groups in the DCB map must be 100%. Strict-priority traffic is serviced first. Afterwards, you can
configure either the peak rates or the committed rates. The 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.
3 Repeat the above procedure to configure PFC and ETS traffic handling for each priority group
4 Specify the dot1p priority-to-priority group mapping for each priority. The priority group range is from 0
to 7. All priorities that map to the same queue must be in the same priority group.
Data Center Bridging (DCB) 298