CANOGA PERKINS 9145EMP NID Software Version 4.0 - Manual (Page 173)

9145EMP NID Software User’s Manual Service OAM
Maintenance End Points
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11.6.6 View the Continuity Check Database for a Maintenance End Point
A MEP periodically transmits a continuity check message (CCM) to ensure connectivity over the
MA to which it belongs. No reply is sent in response to receiving a CCM. The CCM provides a
means to detect connectivity failures in an MA. A connectivity failure occurs if a MEP:
• is unable to receive for more than 3.5 transmission intervals a CCM from a peer MEP in
its MA, indicating either a MEP failure or a network failure. This defect is identified as
RemCCM.
• receives a CCM with an incorrect transmission interval or an incorrect MEP ID, indicating
a configuration error. This defect is identified as ErrCCM.
• receives an AIS message indicating a defect at the underlying level. This defect is identi-
fied as AIS.
• receives a CCM with an incorrect MEP ID or MAID, indicating a configuration error or a
cross connect error. This defect is identified as XCON.
• receives a CCM with an MD Level lower than that of the MEP, indicating a configuration
error or a cross connect error.
• receives a CCM containing a Port Status TLV or Interface Status TLV indicating a failed
bridge port or aggregated port on the far end. This defect is identified as MAC.
Every active MEP receives information about other MEPs in the Maintenance Association. The
information is held in its MEP CCM Database. To view database entries:
• On the Maintenance End Point List screen (Figure 11-18), type B and press Enter. The
current Maintenance End Point is highlighted.
• Press the Space bar to scroll through the list and highlight the entry to view.
• When the Maintenance End Point you want to view is highlighted, press Enter. The CCM
Connectivity Monitoring screen for that MEP (Figure 11-24) opens.
• To view the details of the database entry, type D and press Enter. The CCM Connectivity
Monitoring Details screen (Figure 11-25) opens.