Users Guide

For DCB to operate effectively, you can classify ingress traffic according to its dot1p priority so that it
maps to different data queues. The dot1p-queue assignments used are shown in the following table.
dot1p Value in
the Incoming
Frame
Egress Queue Assignment
0 1
1 0
2 2
3 3
4 4
5 5
6 6
7 7
Dell#show qos dot1p-queue-mapping
Dot1p Priority : 0 1 2 3 4 5 6 7
Queue : 1 0 2 3 4 5 6 7
SNMP Support for PFC and Buffer Statistics Tracking
Buffer Statistics Tracking (BST) feature provides a mechanism to aid in Resource Monitoring and Tuning
of Buffer Allocation. Max Use Count mode in Buffer Statistics is supported. 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 flow 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.
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
fpEgrQBuffSnapsh
otTable
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.
fpIngPgBuffSnapsh
otTable
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.
278
Data Center Bridging (DCB)