Does TIM support LACP (Link Aggregation Control Protocol)?

Document ID : KB000012079
Last Modified Date : 14/02/2018
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 Brief documentation about LACP (Link Aggregation Control Protocol).

 Within the IEEE specification, the Link Aggregation Control Protocol (LACP) provides a method to control the bundling of several physical ports together to form a single logical channel. LACP allows a network device to negotiate an automatic bundling of links by sending LACP packets to the peer (directly connected device that also implements LACP).


Does TIM support LACP (Link Aggregation Control Protocol)?

TIM from 9.5x afterwards.

Network architects can implement aggregation at any of the lowest three layers of the OSI model.

    Examples of aggregation at layer 1 (physical layer) include power line (e.g. IEEE 1901) and wireless (e.g. IEEE 802.11) network devices that combine multiple frequency bands.
    OSI layer 2 (data link layer, e.g. Ethernet frame in LANs or multi-link PPP in WANs, Ethernet MAC address) aggregation typically occurs across switch ports, which can be either physical ports, or virtual ones managed by an operating system.
    Aggregation at layer 3 (network layer) in the OSI model can use round-robin scheduling, hash values computed from fields in the packet header, or a combination of these two methods.

 TIM does not care about that because LACP (Link Aggregation Control Protocol) happens on layer 2. The OS needs to "relink" the 2 feeds when linking aggregation. As long as the TIM sees the application layer, it should work as expected.

 Just make sure that the OS links the 2 feeds together and provides a bond interface to the TIM. Can be for the Mirror and for the Admin interface.


When configuring link aggregation, note the following guidelines and restrictions:

    - Link aggregation is supported only for Ethernet interfaces that are configured in switching mode (family ethernet-switching). Aggregating interfaces that are configured in routed mode (family inet) are not supported.
    - You can configure a LAG by specifying the link number as a physical device and then associating a set of ports with the link. All the ports must have the same speed and be in full-duplex mode. Junos OS assigns a unique ID and port priority to each port. The ID and priority are not configurable.
    - You can optionally configure LACP for link negotiation.
    - You can optionally configure LACP for link protection.
    - You can create up to eight Ethernet ports in each bundle.
    - Each LAG must be configured on both sides of the link. The ports on either side of the link must be set to the same speed. At least one end of the LAG should be configured as active.
    - LAGs are not supported on virtual chassis port links.
    - By default, Ethernet links do not exchange protocol data units (PDUs), which contain 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. The transmitting link is known as the actor and the receiving link is known as the partner.
    - LAGs can only be used for a point-to-point connection.

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