Management Guide R05

C HAPTER 14 | Basic Administration Protocols
Connectivity Fault Management
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◆ 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.
◆ If a maintenance point fails to receive three consecutive CCMs from any
other MEP in the same MA, a connectivity failure is registered.
◆ 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).
◆ 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.
◆ 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.
◆ MIP Creation Type – Specifies the CFM protocol’s creation method for
maintenance intermediate points (MIPs) in this MA:
■
Default – MIPs can be created for this MA on any bridge port
through which the MA’s VID can pass.
■
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.
■
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)