Dasan V8102, Руководство пользователя

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User Manual
UMN:CLI
V8102
781
There are different types of CFM messages:
•
Continuity Check Message (CCM)
Each MEP sends periodic CCMs to other MEPs with a multicast destination address.
The loss of CCMs that ride along the data path would indicate a connectivity failure.
•
Loopback Message/Response (LBM/LBR)
A LBM is sent to a unicast destination MAC address. MEP at the destination MAC
address responds to the LBM with an LBR. These messages are useful for verifying
connectivity with a specific L2 destination.
•
LinkTrace Message/Response (LTM/LTR)
A LTM is sent to a multicast MAC address. Each MIP at the same MD level responds
with a LTR. LTM is then forwarded to the next hop until it reaches the destination
MAC address. These messages are used for tracing the L2 path to a specific L2
destination.
CFM OAM Features
The important features provided by 802.1ag CFM OAM are:
•
Supports Connectivity Check Message (CCM), LinkTrace (LTM) and LoopBack
messages (LBM)
•
Helps service providers assign selected subscribers restricted access to manage all
functions for their own domains
•
Fault detection, notification and verification
•
Traces the path to another MEP or MIP in the same domain
A CFM maintenance domain (MD) is a management space on a network that is owned
and operated by a single entity and defined by a set of ports internal to it, but at its
boundary. To use CFM OAM, you should create MD. MD is defined by a given MD name
and level that are configured by user. MD level determines the MEPs/MIPs that are inter-
ested in the contents of the CFM frame and through which the CFM frame is allowed to
pass.
To create a CFM Maintenance Domain (MD) and configure its name and level, use the
following command.
Command Mode Description
onu cfm md DOMAIN level <0-7>
Global
Creates a MD name and specifies a MD
’s level
DOMAIN: Maintenance Domain
’s name
0-7: MD
’s level to use (default: 0)
no onu cfm md DOMAIN Deletes the configured MD with a unique name.
Each MD has an index, an unique name and MD level. Several MDs can have same level.
But one single MD cannot have several levels.
MEPs periodically exchange Continuity Check OAM messages to detect loss of continuity
or incorrect network connections. To create a Maintenance Association (MA) with its
name as a service instance for a specific MD and specify the interval of Continuity Check
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