Link aggregation modes

An aggregation group operates in one of the following modes:

  • Static LAG: In the static LAG mode of operation, Link failure is not detected as there is no keep alive PDU communication between the devices. A misconfiguration on one side can cause much trouble and be difficult to troubleshoot, because no signaling takes place between the two peers.

  • Dynamic LAG or LACP: The local device and the peer device automatically maintain the aggregation states of the member ports, resulting in link failure being quickly detected by exchanging the PDU. LACP reduces the workload of network administrators.

    Dynamic LAG uses LACP packets to establish the association between two peers. This configuration results in the reduction of the misconfiguration probability. Also, link failures are intelligently handled by two participating devices through the LACP protocol, which is adaptive/dynamic to these network failures.

    Layer 2 aggregation groups and Layer 3 aggregation groups support both the static and dynamic modes.