Users Guide

Table 17. Queue Assignments
Internal-
priority
0 1 2 3 4 5 6 7
Queue 0 0 0 1 2 3 3 3
3 Dot1p->Queue Mapping Conguration is retained at the default value.
Default dot1p-queue mapping is,
Dell#show qos dot1p-queue-mapping
Dot1p Priority : 0 1 2 3 4 5 6 7
Queue : 2 0 1 3 4 5 6 7
4 Interface Congurations on server connected ports.
a Enable DCB globally.
Dell(conf)#dcb enable
b Apply PFC Priority conguration. Congure priorities on which PFC is enabled.
Dell(conf-if-te-1/1)#pfc priority 1,2
SNMP Support for PFC and Buer Statistics Tracking
Buer Statistics Tracking (BST) feature provides a mechanism to aid in Resource Monitoring and Tuning of Buer Allocation. The Max Use
Count mode provides the maximum value of the counters accumulated over a period of time.
Priority Flow Control (PFC) provides a link level ow control mechanism, which is controlled independently for each frame priority. The goal
of this mechanism is to ensure zero loss under congestion in DCB networks.
Dell Networking OS provides SNMP support for monitoring PFC and BST counters, and statistics. The enhancement is made on DELL-
NETWORKING-FPSTATS-MIB with additional tables to display the PFC and BST counters and statistics.
The following tables are available in DELL-NETWORKING-FPSTATS-MIB:
• dellNetFpEgrQBuSnapshotTable
• dellNetFpIngPgBuSnapshotTable
• dellNetFpStatsPerPgTable
• dellNetPfcPerPrioTable
dellNetFpEgrQBuS
napshotTable
This table fetches the BST statistics at Egress Port for the buer used. This table displays the Snapshot of the
Buer cells used by Unicast and Multicast Data and Control Queues.
dellNetFpIngPgBuS
napshotTable
This table fetches the BST statistics at the Ingress Port for 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, display in this table. This table lists the stack-unit index, port number and the priority
group number.
dellNetFpStatsPerP
gTable
This table fetches the Allocated Min cells, Shared cells, and Headroom cells per Priority Group, the mode in which
the buer 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 lists thestack-unit number, port number and priority group number.
dellNetPfcPerPrioTa
ble
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 lists the stack-unit index, port number and
priority.
256 Data Center Bridging (DCB)