C
HAPTER
14
| Basic Administration Protocols
Connectivity Fault Management
– 525 –
â—† Multiple domains at the same maintenance level cannot have an MA on
the same VLAN (see "Configuring CFM Maintenance Domains" on
page 519).
â—† Before removing an MA, first remove the MEPs assigned to it (see
"Configuring Maintenance End Points" on page 529).
â—† For a detailed description of the MIP types, refer to the Command
Usage section under "Configuring CFM Maintenance Domains" on
page 519.
Configuring Detailed Settings for a Maintenance Association
â—† CCMs are multicast periodically by a MEP in order to discover other
MEPs in the same MA, and to assure connectivity to all other MEPs/MIPs
in the MA.
â—† Each CCM received is checked to verify that the MEP identifier field sent
in the message does not match its own MEP ID, which would indicate a
duplicate MEP or network loop. If these error types are not found, the
CCM is stored in the MEP’s local database until aged out.
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 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.
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