R211x-HP Flexfabric 11900 Layer 2 - LAN Switching Command Reference

Related commands

priority-flow-control no-drop dot1p

IMPORTANT:

This command is applicable to only SF cards.

Use priority-flow-control no-drop dot1p to enable PFC for specific 802.1p priorities on an Ethernet

interface.

Use undo priority-flow-control no-drop dot1p to restore the default.

Syntax

priority-flow-control no-drop dot1p dot1p-list

undo priority-flow-control no-drop dot1p

Default

PFC is disabled for all 802.1p priorities.

Views

System view, Ethernet interface view

Predefined user roles

network-admin

mdc-admin

Parameters

dot1p-list: Specifies an 802.1p priority (or dot1p priority) list to identify flows that are subject to PFC(for

example: 1,3-5). A hyphen (-) connects two numeric values, which together indicate a continuous value

range. Different values or value ranges are separated with commas (,). You can configure up to 16

characters for this argument.

Usage guidelines

You can enable PFC for certain 802.1p priorities at the two ends of a link. When network congestion

occurs, the local device checks the PFC status for the 802.1p priority carried in each arriving packet. The

device processes the packet depending on the PFC status as follows:

• If PFC is enabled for the 802.1p priority, the local device accepts the packet and sends a PFC pause

frame to the peer. The peer stops sending packets carrying this 802.1p priority for an interval as

specified in the PFC pause frame. This process is repeated until the congestion is removed.

• If PFC is disabled for the 802.1p priority, the local port drops the packet.

The relationship between the PFC function and the generic flow control function is shown in Table 9.