Ethernet Connection Fault Management
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"FD 100/320Gbps NT and FX NT IHub System
Basics, Management and OAM Guide"
3HH-11982-AAAA-TQZZA Issue: 10
Figure 4 MEP, MIP and MD levels
8.2.1 Loopback
CFM supports a loopback test to verify the availability of a MAC address destination.
When a loopback test is performed, the MEP launches an LBM to another MEP or
MIP along the MA to check whether there is a failure in between the two points, and
the location of the failure. If there is a fault along the path, the MIP in front of the fault
responds with an LBR, but the MIP/MEP that is behind the fault does not. In order to
perform a loopback test, the MAC address of the destination MIP/MEP must be
known, either by manual configuration, or by auto-discovery.
8.2.2 Link Trace Test
CFM also supports the link trace test to retrieve information about the forwarding
path to a MAC destination. When a link trace test is performed, the MEP launches
an LTM to the destination MAC address of the CFM link trace group. The MIPs/MEPs
along the path respond with LTR messages. If there is a fault along the path, the MIP
in front of the fault responds with an LBR, but the MIP/MEP that is behind the fault
does not. In order to perform a link trace test, the MAC address of the destination
MIP/MEP must be known, either by manual configuration or by auto-discovery.
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