Services Overview
7705 SAR OS Services Guide Page 73
• CCM declares a fault when it:
→ stops hearing from one of the remote MEPs for a period of 3.5 times the CC
interval
→ hears from a MEP with a lower MD level
→ hears from a MEP that is not in the same MA
→ hears from a MEP that is in the same MA but is not in the configured MEP list
→ hears from a MEP that is in the same MA with the same MEP ID as the
receiving MEP
→ recognizes that the CC interval of the remote MEP does not match the local
configured CC interval
→ recognizes that the remote MEP declares a fault
An alarm is raised and a trap is sent if the defect is greater than or equal to the
configured low-priority-defect value.
• CC must be enabled in order for RDI information to be carried in the CCM
OAMPDU
ETH-RDI
The Ethernet Remote Defect Indication function (ETH-RDI) is used by a MEP to
communicate to its peer MEPs that a defect condition has been encountered. Defect
conditions such as signal fail and AIS may result in the transmission of frames with ETH-
RDI information. ETH-RDI is used only when ETH-CC transmission is enabled.
ETH-RDI has the following two applications:
• single-ended fault management — the receiving MEP detects an RDI defect
condition, which gets correlated with other defect conditions in this MEP and may
become a fault cause. The absence of received ETH-RDI information in a single
MEP indicates the absence of defects in the entire MEG.
• contribution to far-end performance monitoring — the transmitting MEP reflects
that there was a defect at the far end, which is used as an input to the performance
monitoring process
A MEP that is in a defect condition transmits frames with ETH-RDI information. A MEP,
upon receiving frames with ETH-RDI information, determines that its peer MEP has
encountered a defect condition.
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