ECS3510-28T_Management Guide-R05

C HAPTER 40 | CFM Commands
Continuity Check Operations
– 1332 –
is registered. The interval at which CCMs are issued should therefore 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.
EXAMPLE
This example sets the transmission delay for continuity check messages to
level 7 (60 seconds).
Console(config)#ethernet cfm cc md voip ma rd interval 7
Console(config)#
RELATED COMMANDS
ethernet cfm cc enable (1332)
ethernet cfm cc
enable
This command enables the transmission of continuity check messages
(CCMs) within a specified maintenance association. Use the no form to
disable the transmission of these messages.
SYNTAX
[no] ethernet cfm cc enable md domain-name ma ma-name
domain-name – Domain name. (Range: 1-43 alphanumeric
characters)
ma-name – Maintenance association name. (Range: 1-43
alphanumeric characters)
DEFAULT SETTING
Disabled
COMMAND MODE
Global Configuration
COMMAND USAGE
◆ 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.
◆ Each CCM received is checked to verify that the MEP identifier field sent
in the message does not match its own MEPID, 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.