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    Configuring an LFM Link

    LFM is used for monitoring link operations for physical point-to-point links connecting peer OAM entities. The primary benefits of LFM are:

    • Failure detection on physical links in both directions, as well as unidirectional failures.
    • Ability to put a port in link-loopback mode remotely for diagnostics.
    • Automatic actions upon occurrence of critical events

    LFM runs at the physical or aggregated interface level. When configured on an aggregated interface, LFM is run individually on each member link. LFM is a link-layer protocol and does not need a Layer 3 (IPv4 or IPv6) address to operate. This allows for LFM to function on circuit cross-connect/transport cross-connect (CCC/TCC) encapsulated interfaces

    To configure an LFM ink:

    Before you create an LFM link, you must ensure that the two devices that need to be connected using the LFM link must be discovered and prestaged in the Connectivity Services Director database, and must have the necessary interfaces configured on the devices.

    1. From the View selector, select Device View.

      The workspaces that are applicable to this view are displayed.

    2. From the Junos Space user interface, click the Deploy icon on the Connectivity Services Director banner.

      The functionalities that you can configure in this mode are displayed in the task pane.

    3. From the View pane, click the plus sign (+) beside the My Network item in the View pane to expand the tree and select the device node you want for which you want to create the LFM profile.

      The device type selected within the device model tree is highlighted.

    4. From the Tasks pane, select OAM > LFM Link.

      The Manage LFM Links page is displayed. The following fields are displayed on this page:

      • Name—Name of the LFM link.
      • Profile Name—Name of the LFM profile associated with the LFM link.
      • Device 1—Hostname of the device that functions as one end of the LFM link.
      • Device 2—Hostname of the device that functions as the other end of the LFM link.
      • Link Status—Status of the LFM link: Up or Down.
      • Details—Click the link to open a pop-up dialog box that displays the detailed configuration settings of the LFM link.
    5. Click the New icon at the top of the page.

      The LFM Link Create dialog box is displayed.

    6. In the Link Name field, type a name for the link .
    7. In the LFM Profile list, select an LFM profile.
    8. Under the Endpoint 1 section, do the following to select the device and associated interface as one end of the LFM link:
      1. In the PE Device field, click the Select button to select the N-PE device you want to use for the first endpoint. From the Choose Endpoints dialog box that appears, select the devices that you want to participate in the service. The lower part of the dialog box refreshes to display the interfaces associated with the selected device. Select the check box next to the interface you want to associate with the LFM link.
      2. In the UNI Interface field, click the Select button to select the ingress or user-to-network (UNI) interface of the PE device that you selected to be the first device to connect one end of the LFM link. From the Choose Endpoints dialog box, if you did not previously select a UNI interface for the device you selected, select the check box next to the interface you want to use for one end of the LFM link.
    9. Under the Endpoint 2 section, do the following to select the device and associated interface as the other end of the LFM link:
      1. In the PE Device field, click the Select button to select the N-PE device you want to use for the second endpoint. From the Choose Endpoints dialog box that appears, select the devices that you want to participate in the service. The lower part of the dialog box refreshes to display the interfaces associated with the selected device. Select the check box next to the interface you want to associate with the LFM link.
      2. In the UNI Interface field, click the Select button to select the ingress or user-to-network (UNI) interface of the PE device that you selected to be the first device to connect one end of the LFM link. From the Choose Endpoints dialog box, if you did not previously select a UNI interface for the device you selected, select the check box next to the interface you want to use as the other end of the LFM link.
    10. Click Attach to create the LFM link.

      The LFM Link Create wizard closes, and you are returned to the Manage LFM Links page that shows the LFM link that you created.

    After you configure an LFM link successfully, if a problem is detected in any of the interfaces, the device generates one of the following alarms, which indicates the reason for the alarm:

    • Undefined
    • Config disabled
    • Removed from AE
    • Reserved ifl deleted
    • FSM restarted
    • Dying gasp
    • Local link fault
    • Remote link fault
    • Critical event
    • Local unsatisfied
    • Remote unsatisfied
    • Adjacency lost

    To view alarms associated with the LFM service:

    1. In the Network Application Platform task pane, select Manage LFM Link.
    2. Right-click the link and select View Service Alarms.

    Modified: 2016-03-02