Chapter 13
| Basic Administration Protocols
Connectivity Fault Management
– 501 –
â—† If a maintenance point fails to receive three consecutive CCMs from any other
MEP in the same MA, a connectivity failure is registered.
â—† If a maintenance point receives a CCM with an invalid MEPID or MA level or an
MA level lower than its own, a failure is registered which indicates a
configuration error or cross-connect error (i.e., overlapping MAs).
â—† The interval at which CCMs are issued should be configured to detect
connectivity problems in a timely manner, as dictated by the nature and size of
the MA.
â—† The maintenance of a MIP CCM database by a MIP presents some difficulty for
bridges carrying a large number of Service Instances, and for whose MEPs are
issuing CCMs at a high frequency. For this reason, slower CCM transmission
rates may have to be used.
Parameters
These parameters are displayed:
Creating a Maintenance Association
◆ MD Index – Domain index. (Range: 1-65535)
◆ MA Index – MA identifier. (Range: 1-2147483647)
◆ MA Name – MA name. (Range: 1-43
18
alphanumeric characters)
Each MA name must be unique within the CFM domain.
◆ Primary VLAN – Service VLAN ID. (Range: 1-4094)
This is the VLAN through which all CFM functions are executed for this MA.
◆ MIP Creation Type – Specifies the CFM protocol’s creation method for
maintenance intermediate points (MIPs) in this MA:
â–
Default – MIPs can be created for this MA on any bridge port through
which the MA’s VID can pass.
â–
Explicit – MIPs can be created for this MA only on bridge ports through
which the MA’s VID can pass, and only if a maintenance end point (MEP) is
created at some lower MA Level.
â–
None – No MIP can be created for this MA.
Configuring Detailed Settings for a Maintenance Association
◆ MD Index – Domain index. (Range: 1-65535)
◆ MA Index – MA identifier. (Range: 1-2147483647)
18. The total length of the MD name and MA name cannot exceed 44 characters.
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