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NOTE:
Dell Networking does not recommend mapping all ingress traffic to a single queue when using
PFC and ETS. However, Dell Networking does recommend using Ingress traffic classification using the
service-class dynamic dot1p command (honor dot1p) on all DCB-enabled interfaces. If you use L2
class maps to map dot1p priority traffic to egress queues, take into account the default dot1p-queue
assignments in the following table and the maximum number of two lossless queues supported on a port
(refer to
Configuring Lossless
Although Dell Networking OS allows you to change the default dot1p priority-queue assignments (refer to
Setting dot1p Priorities for Incoming
you reconfigure dot1p-queue mapping. If the configured DCB policy remains valid, the change in the
dot1p-queue assignment is allowed.
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
Egress Queue Assignment
the Incoming
Frame
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
Queue : 1
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
Queues).
Traffic), DCB policies applied to an interface may become invalid if
1
2
3
4
5
6
0
2
3
4
5
6
7
7
Data Center Bridging (DCB)
297
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