Snmp Support For Pfc And Buffer Statistics Tracking; Performing Pfc Using Dscp Bits Instead Of 802.1P Bits - Dell S6100 Configuration Manual

The internal Priority assigned for the packet by Ingress FP is used by the memory management unit (MMU) to assign the packet to right
queue by indexing the internal-priority to queue map table (TABLE 1) in hardware.
PRIO2COS setting for honoring the PFC protocol packets from the Peer switches is as per above Packet-Dot1p->queue table (Table 2).
The packets come in with packet-dot1p 2 alone are assign to PG6 on ingress.
The packets come in with packet-dot1p 2 alone use Q2 (as per dot1p to Queue classification – Table 2) on the egress port.
• When Peer sends a PFC message for Priority 2, based on above PRIO2COS table (TABLE 2), Queue 2 is halted.
• Queue 2 starts buffering the packets with Dot1p 2. This causes PG6 buffer counter to increase on the ingress, since P-dot1p 2 is
mapped to PG6.
• As the PG6 watermark threshold is reached, PFC generats for dot1p 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 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
• dellNetFpStatsPerPgTable
• dellNetPfcPerPrioTable
dellNetFpEgrQBuffS This table fetches the BST statistics at Egress Port for the buffer used. This table displays the Snapshot of the
napshotTable Buffer cells used by Unicast and Multicast Data and Control Queues.
dellNetFpIngPgBuffS This table fetches the BST statistics at the Ingress Port for the Shared Cells, and the Headroom cells used per
napshotTable 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 This table fetches the Allocated Min cells, Shared cells, and Headroom cells per Priority Group, the mode in which
gTable the buffer 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 This table fetches the number of PFC frames transmitted (PFC Requests) and the number of PFC frames
ble received (PFC Indications) per priority on a per port basis. This table lists the stack-unit index, port number and
priority.
Performing PFC Using DSCP Bits Instead of 802.1p
Bits
Priority based Flow Control (PFC) is currently supported on Dell Networking OS for tagged packets based on the packet Dot1p. In certain
data center deployments, VLAN configuration is avoided on the servers and all packets from the servers are untagged. These packets will
carry IP header and can be differentiated based on the DSCP fields they carry on the server facing switch ports. Requirement is to classify
these untagged packets from the server based on their DSCP and provide PFC treatment.
Data Center Bridging (DCB) 247