Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 237)

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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 Queues).

Although Dell Networking OS allows you to change the default dot1p priority-queue assignments

(refer to Setting dot1p Priorities for Incoming Traffic), DCB policies applied to an interface may

become invalid if you reconfigure dot1p-queue mapping. If the configured DCB policy remains

valid, the change in the dot1p-queue assignment is allowed.

dot1p Value in the

Incoming Frame

Egress Queue Assignment

0 2

1 0

2 1

3 3

4 4

5 5

6 6

7 7

SNMP Support for PFC and Buffer Statistics Tracking

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 introduced in Dell Networking

OS 9.3(0.1). 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 added in F10-FPSTATS MIB in Dell Networking OS 9.3(0.1):

• fpEgrQBuffSnapshotTable

• fpIngPgBuffSnapshotTable

• fpStatsPerPgTable

• pfcPerPrioTable

fpEgrQBuffSna

pshotTable

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.

fpIngPgBuffSna

pshotTable

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.

Data Center Bridging (DCB)

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