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    Configuring Aggregated Ethernet LACP (CLI Procedure)

    For aggregated Ethernet interfaces on EX Series switches, you can configure the Link Aggregation Control Protocol (LACP). LACP is one method of bundling several physical interfaces to form one logical interface. You can configure aggregated Ethernet with or without LACP enabled.

    LACP was designed to achieve the following:

    • Automatic addition and deletion of individual links to the aggregate bundle without user intervention
    • Link monitoring to check whether both ends of the bundle are connected to the correct group

    Note: You can also configure LACP link protection of aggregated Ethernet interfaces. For information, see Configuring LACP Link Protection of Aggregated Ethernet Interfaces (CLI Procedure).

    The Junos OS implementation of LACP provides link monitoring but not automatic addition and deletion of links.

    Before you configure LACP, be sure you have:

    When LACP is enabled, the local and remote sides of the aggregated Ethernet links exchange protocol data units (PDUs), containing information about the state of the link. You can configure Ethernet links to actively transmit PDUs, or you can configure the links to passively transmit them, sending out LACP PDUs only when they receive them from another link. One side of the link must be configured as active for the link to be up.

    Note: Do not add LACP to a LAG if the remote end of the LAG link is a security device, unless the security device supports LACP. Security devices often do not support LACP because they require a deterministic configuration.

    To configure LACP:

    1. Enable one side of the aggregated Ethernet link as active:
      [edit interfaces]
      user@switch# set aex aggregated-ether-options lacp active
    2. Specify the interval at which the interfaces send LACP packets:
      [edit interfaces]
      user@switch# set aex aggregated-ether-options lacp periodic fast

    Note: The LACP process exists in the system only if you configure the system in either active or passive LACP mode.

     

    Related Documentation

     

    Published: 2012-12-07

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