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Configure Ethernet OAM Link Fault Management

Ethernet OAM link fault management (LFM) can be used for physical link-level fault detection and management. The IEEE 802.3ah LFM works across point-to-point Ethernet links either directly or through repeaters.

To configure Ethernet OAM LFM using the CLI:

  1. Enable IEEE 802.3ah OAM support on an interface:
    Note:

    You can configure Ethernet OAM LFM on aggregated interfaces.

    Note:

    The remaining steps are optional. You can choose which of these features to configure for Ethernet OAM LFM on your switch.

  2. Specify whether the interface or the peer initiates the discovery process by configuring the link discovery mode to active or passive (active = interface initiates; passive = peer initiates):
  3. Configure a periodic OAM PDU-sending interval (in milliseconds) for fault detection:
  4. Specify the number of OAM PDUs that an interface can miss before the link between peers is considered down:
  5. Configure event threshold values on an interface for the local errors that trigger the sending of link event TLVs:

    • Set the threshold value (in seconds) for sending frame-error events or taking the action specified in the action profile:

    • Set the threshold value (in seconds) for sending frame-period events or taking the action specified in the action profile:

    • Set the threshold value (in seconds) for sending frame-period-summary events or taking the action specified in the action profile:

    • Set the threshold value (in seconds) for sending symbol-period events or taking the action specified in the action profile:

    Note:

    You can disable the sending of link event TLVs.

    To disable the sending of link event TLVs:

  6. Create an action profile to define event fault flags and thresholds to be taken when the link fault event occurs. Then apply the action profile to one or more interfaces. (You can also apply multiple action profiles to a single interface.)
    1. Name the action profile:
    2. Specify actions to be taken by the system when the link fault event occurs:
    3. Specify events for the action profile:
    Note:

    For each action profile, you must specify at least one link event and one action. The actions are taken only when all of the events in the action profile are true. If more than one action is specified, all actions are executed. You can set a low threshold for a specific action such as logging the error and set a high threshold for another action such as system logging.

  7. Set a remote interface into loopback mode so that all frames except OAM PDUs are looped back without any changes made to the frames. Set the remote DTE in loopback mode (the remote DTE must support remote-loopback mode) and then enable remote loopback support for the local interface.