Users Guide

The SNMP support for monitoring PFC and BST counters and statistics is supported. The enhancement is made on F10-FPSTATS MIB
with additional tables to display the PFC and BST counters and statistics.
The following new tables are supported in F10-FPSTATS MIB
• fpEgrQBuffSnapshotTable
• fpIngPgBuffSnapshotTable
• fpStatsPerPgTable
• pfcPerPrioTable
fpEgrQBuffSnapsho
tTable
This table fetches the BST statistics at Egress Port with respect to the buffer used. This table displays the
Snapshot of the Buffer cells used by Unicast and Multicast Data and Control Queues.
fpIngPgBuffSnapsho
tTable
This table fetches the BST statistics at the Ingress Port with respect to the Shared Cells 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.
Leave a space between each priority group number. For example: priority-pgid 0 0 0 1 2 4 4 4 in which priority group 0 maps to
dot1p priorities 0, 1, and 2; priority group 1 maps to dot1p priority 3; priority group 2 maps to dot1p priority 4; priority group 4 maps to
dot1p priorities 5, 6, and 7.
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Data Center Bridging (DCB)