Administrator Guide

88 Switch Feature Overview
Connectivity Fault Management (IEEE 802.1ag)
The Connectivity Fault Management (CFM) feature, also known as Dot1ag,
supports Service Level Operations, Administration, and Management
(OAM). CFM is the OAM Protocol provision for end-to-end service layer
instance in carrier networks. The CFM feature provides mechanisms to help
perform connectivity checks, fault detection, fault verification and isolation,
and fault notification per service in a network domain.
For information about configuring IEEE 802.1ag settings, see "Connectivity
Fault Management" on page 981.
Priority-based Flow Control (PFC)
The Priority-based Flow Control feature allows the switch to pause or inhibit
transmission of individual priorities within a single Ethernet link. By
configuring PFC to pause a congested priority (priorities) independently,
protocols that are highly loss sensitive can share the same link with traffic that
has different loss tolerances. Priorities are differentiated by the priority field
of the 802.1Q VLAN header. The Dell EMC Networking N4000 Series
switches support lossless transport of frames on up to two priority classes.
For information about configuring the PFC feature, see "Data Center
Bridging Features" on page 1109.
NOTE: This feature is available on the Dell EMC Networking N4000 Series
switches only.
NOTE: This feature is available on the Dell EMC Networking N4000 Series
switches only.
NOTE: An interface that is configured for PFC is automatically disabled for 802.3x
flow control.