H3C LS-3100-52P-OVS-H3 Operation Manual - page 221
1-1
1
Connectivity Fault Detection Configuration
When configuring CFD, go to these sections for information you are interested in:
z
Overview
z
CFD Configuration Task List
z
Basic Configuration Tasks
z
Configuring CC on MEPs
z
Configuring LB on MEPs
z
Configuring LT on MEPs
z
Displaying and Maintaining CFD
z
CFD Configuration Examples
Overview
Connectivity Fault Detection (CFD) 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. A MD is identified by an
MD name.
To locate faults exactly, 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.