Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 238)

100

101

fpStatsPerPgTa

ble

This table fetches the Allocated Min cells, Shared cells and Headroom cells per

Priority Group, the mode in which 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 is indexed by stack-unit number, port

number and priority group number.

pfcPerPrioTabl

This table fetches the number of PFC frames transmitted (PFC Requests) and the

number of PFC frames received (PFC Indications) per priority on a per port basis.

This table is indexed by the stack-unit index, port number and priority.

Configuring Priority-Based Flow Control

PFC provides a flow control mechanism based on the 802.1p priorities in converged Ethernet traffic

received on an interface and is enabled by default when you enable DCB.

As an enhancement to the existing Ethernet pause mechanism, PFC stops traffic transmission for

specified priorities (Class of Service (CoS) values) without impacting other priority classes. Different traffic

types are assigned to different priority classes.

When traffic congestion occurs, PFC sends a pause frame to a peer device with the CoS priority values of

the traffic that is to be stopped. Data Center Bridging Exchange protocol (DCBx) provides the link-level

exchange of PFC parameters between peer devices. PFC allows network administrators to create zero-

loss links for Storage Area Network (SAN) traffic that requires no-drop service, while retaining packet-

drop congestion management for Local Area Network (LAN) traffic.

To ensure complete no-drop service, apply the same DCB input policy with the same pause time and

dot1p priorities on all PFC-enabled peer interfaces.

To configure PFC and apply a PFC input policy to an interface, follow these steps.

1. Create a DCB input policy to apply pause or flow control for specified priorities using a configured

delay time.

CONFIGURATION mode

dcb-input policy-name

The maximum is 32 alphanumeric characters.

2. Configure the link delay used to pause specified priority traffic.

DCB INPUT POLICY mode

pfc link-delay value

One quantum is equal to a 512-bit transmission.

The range (in quanta) is from 712 to 65535.

The default is 45556 quantum in link delay.

3. Configure the CoS traffic to be stopped for the specified delay.

DCB INPUT POLICY mode

pfc priority priority-range

238

Data Center Bridging (DCB)

1 2 ... 233 234 235 236 237 238 239 240 241 242 243 ... 985 986

Komentáře k této Příručce

Žádné komentáře

Dell Networking S6000 Uživatelský manuál Strana 238

Komentáře k této Příručce

Související produkty a manuály pro Software Dell Networking S6000