Dynamic Trunks (LAGs)

The MCT client creates a single dynamic trunk group towards the MCT cluster devices. This dynamic trunk group is composed of two trunk groups, each configured on one of the MCT devices. The dynamic trunk group operates using the Link Aggregation Control Protocol (LACP).

For the two dynamic trunk groups of the MCT to behave as a single trunk group from the MCT client’s perspective, both of the dynamic trunk groups must have the same LACP system ID and key (referred to as the MCT system ID and MCT key).

Note: The LAG IDs are only significant locally and need not match on the two ends of a LAG.

Typically, the LACP system ID in an MCT-supporting device is derived from the port MAC address. However, to support LACP over MCT, the ID must be obtained in another way. MCT uses a predefined algorithm to generate this ID.

Note: Each MCT cluster device has a unique cluster ID and one MCT client ID. The LACP key is predefined from the client ID and cluster ID. The user cannot change the key.

MCT control protocol synchronization is minimal. The LACP runs independently on the cluster devices.

Parent topic: Layer 2 Behavior with MCT