Install Guide

Expected PFC
Priority
1 2
To configure the aforementioned DSCP and PFC priority values, perform the following tasks:
1. Create class-maps to group the DSCP subsets
class-map match-any dscp-pfc-1
match ip dscp 0-5,10-15
!
class-map match-any dscp-pfc-2
match ip dscp 20-25,30-35
2. Associate above class-maps to Queues Queue assignment as below.
Table 23. Queue Assignments
Internal-priority Queue
0 0
1 0
2 0
3 1
4 2
5 3
6 3
7 3
DellEMC(conf)#do show qos dot1p-queue-mapping
Dot1p Priority : 0 1 2 3 4 5 6 7
Queue : 1 0 2 3 4 5 6 7
3. Dot1p->Queue Mapping Configuration is retained at the default value.
4. Interface Configurations on server connected ports.
a. Enable DCB globally.
DellEMC(conf)#dcb enable
b. Apply PFC Priority configuration. Configure priorities on which PFC is enabled.
DellEMC(conf-if-tf-1/1)#pfc priority 1,2
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.
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 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.
Dell EMC 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:
● dellNetFpEgrQBuffSnapshotTable
● dellNetFpIngPgBuffSnapshotTable
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Data Center Bridging (DCB)