H3C Technologies H3C S3100 Series Switches - Manual (Page 1039)

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CFD Configuration
When configuring CFD, go to these sections for information you are interested in:
z Overview
z CFD Configuration Task List
z Configuring Basic CFD Settings
z Configuring CFD Functions
z Displaying and Maintaining CFD
z CFD Configuration Example
Only the S3100-EI series support CFD Configuration.
Overview
Connectivity Fault Detection (CFD), which conforms to Connectivity Fault Management (CFM) defined
by IEEE 802.1ag, is an end-to-end per-VLAN link layer Operations, Administration and Maintenance
(OAM) mechanism used for link connectivity detection, fault verification, and fault location.
Basic Concepts in CFD
Maintenance domain
A maintenance domain (MD) defines the network where CFD plays its role. The MD boundary is defined
by some maintenance association end points (MEPs) configured on the ports. An MD is identified by an
MD name.
To accurately locate faults, CFD introduces eight levels (from 0 to 7) to MDs. The bigger the number, the
higher the level and the larger the area covered. Domains can touch or nest (if the outer domain has a
higher level than the nested one) but cannot intersect or overlap.
MD levels facilitate fault location and make fault location more accurate. As shown in Figure 1-1 , MD_A
in light blue nests MD_B in dark blue. If a connectivity fault is detected at the boundary of MD_A, any of
the devices in MD_A, including Device A through Device E, may fail. In this case, if a connectivity fault is
also detected at the boundary of MD_B, the failure points may be any of Device B through Device D. If
the devices in MD_B operate normally, you can be sure that at least Device C is operational.