User Manual UMN:CLI
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7.6 EFM OAM
EFM OAM capabilities are a need for Ethernet subscriber access link monitoring in L2,
remote loopback and remote failure indication. EFM OAM uses a slow protocol frame
which is called OAM Protocol Data Units (OAMPDUs). Using OAMPDUs, local DTE
manages the remote DTE.
There are five EFM OAM operations for local DTE to manage remote DTE.
• OAM Discovery
Local DTE exchanges OAM status information with remote DTE using OAMPDUs.
• Remote Loopback
Local DTE diagnoses the connection of remote DTE using loopback control.
- Enables the loopback status of remote DTE using OAMPDUs from local DTE.
- Monitors the link condition by loopback function when local DTE receives back
every packet it sends to remote DTE.
• Link Monitoring
Local DTE monitors and informs remote DTE of the event notifications related to the
link faults.
• Remote Failure Indication
Local DTE indicates a loss of signal (Link Fault), unrecoverable errors (Dying
Gasp) and undefined critical errors (Critical Event)
• Variable Retrieval
Local DTE sends a variable request OAMPDU and gets a value of MIB variable for
information retrieval of remote OAM port.
7.6.1 Enabling EFM OAM
To enable/disable EFM OAM function, use the following command.
Enables EFM OAM.
PORTS: port number
Disables EFM OAM.
PORTS: port number
7.6.2 OAM Link Monitoring
To enable/disable the link monitoring function, use the following command.
oam efm link-monitor enable PORTS
Enables link monitoring function.
PORTS: port number
oam efm link-monitor disable PORTS
Disables link monitoring function.
PORTS: port number
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