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show lacp interfaces (View)



Display Link Aggregation Control Protocol (LACP) information about the specified aggregated Ethernet interface, redundant Ethernet interface, Gigabit Ethernet interface, or 10-Gigabit Ethernet interface. If you do not specify an interface name, LACP information for all interfaces is displayed.



Display LACP information for all interfaces.


(Optional) Display LACP information for the specified interface:

  • Aggregated Ethernet—aenumber

  • Redundant Ethernet—rethnumber

  • Gigabit Ethernet—ge-fpc/pic/port

  • 10-Gigabit Ethernet—xe-fpc/pic/port


The show lacp interfaces command returns the following error message if your system is not configured in either active or passive LACP mode:

“Warning: lacp subsystem not running – not needed by configuration”

Required Privilege Level


Output Fields

Table 1 lists the output fields for the show lacp interfaces command. Output fields are listed in the approximate order in which they appear.

Table 1: show lacp interfaces Output Fields

Field Name

Field Description

Aggregated interface

Aggregated interface value.

LACP State

LACP state information for each aggregated interface:

  • Role—Role played by the interface. It can be one of the following:

    • Actor—Local device participating in LACP negotiation.

    • Partner—Remote device participating in LACP negotiation.

  • Exp—Expired state. Yes indicates the actor or partner is in an expired state. No indicates the actor or partner is not in an expired state.

  • Def—Default. Yes indicates that the actor’s receive machine is using the default operational partner information, administratively configured for the partner. No indicates the operational partner information in use has been received in a link aggregation control protocol data unit (PDU).

  • Dist—Distribution of outgoing frames. No indicates distribution of outgoing frames on the link is currently disabled and is not expected to be enabled. Otherwise, the value is Yes.

  • Col—Collection of incoming frames. Yes indicates collection of incoming frames on the link is currently enabled and is not expected to be disabled. Otherwise, the value is No.

  • Syn—Synchronization. If the value is Yes, the link is considered synchronized. It has been allocated to the correct link aggregation group, the group has been associated with a compatible aggregator, and the identity of the link aggregation group is consistent with the system ID and operational key information transmitted. If the value is No, the link is not synchronized. It is currently not in the right aggregation.

  • Aggr—Ability of aggregation port to aggregate (Yes) or to operate only as an individual link (No).

  • Timeout—LACP timeout preference. Periodic transmissions of link aggregation control PDUs occur at either a slow or fast transmission rate, depending upon the expressed LACP timeout preference (Long Timeout or Short Timeout).

  • Activity—Actor or partner’s port activity. Passive indicates the port’s preference for not transmitting link aggregation control PDUs unless its partner’s control value is Active. Active indicates the port’s preference to participate in the protocol regardless of the partner’s control value.

LACP Protocol

LACP protocol information for each aggregated interface:

  • Link state (active or standby) indicated in parentheses next to the interface when link protection is configured.

  • Receive State—One of the following values:

    • Current—The state machine receives a link aggregation control PDU and enters the Current state.

    • Defaulted—If no link aggregation control PDU is received before the timer for the Current state expires a second time, the state machine enters the Defaulted state.

    • Expired—If no link aggregation control PDU is received before the timer for the Current state expires once, the state machine enters the Expired state.

    • Initialize—When the physical connectivity of a link changes or a Begin event occurs, the state machine enters the Initialize state.

    • LACP Disabled—If the port is operating in half duplex, the operation of LACP is disabled on the port, forcing the state to LACP Disabled. This state is similar to the Defaulted state, except that the port is forced to operate as an individual port.

    • Port Disabled—If the port becomes inoperable and a Begin event has not occurred, the state machine enters the Port Disabled state.

  • Transmit State—Transmit state of state machine. One of the following values:

    • Fast Periodic—Periodic transmissions are enabled at a fast transmission rate.

    • No Periodic—Periodic transmissions are disabled.

    • Periodic Timer—Transitory state entered when the periodic timer expires.

    • Slow Periodic—Periodic transmissions are enabled at a slow transmission rate.

  • Mux State—State of the multiplexer state machine for the aggregation port. The state is one of the following values:

    • Attached—Multiplexer state machine initiates the process of attaching the port to the selected aggregator.

    • Collecting Distributing—Collecting and distributing states are merged together to form a combined state (coupled control). Because independent control is not possible, the coupled control state machine does not wait for the partner to signal that collection has started before enabling both collection and distribution.

    • Detached—Process of detaching the port from the aggregator is in progress.

    • Waiting—Multiplexer state machine is in a holding process, awaiting an outcome.

Sample Output

show lacp interfaces (Aggregated Ethernet)

show lacp interfaces (Redundant Ethernet)

show lacp interfaces (Gigabit Ethernet)

Release Information

Command modified in Junos OS Release 10.2.