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◆
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: 1-40943)
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)
Chapter 13
– 455 –
| Basic Administration Protocols
Connectivity Fault Management
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