SMLT Topologies
The two switches between which the SMLT is split are known as aggregation switches and form a logical cluster which appears to the other end of the SMLT link as a single switch.
The split may be at one or at both ends of the MLT. If both ends of the link are split, the resulting topology is referred to as an "SMLT square" when there is no cross-connect between diagonally opposite aggregation switches, or an "SMLT mesh" when each aggregation switch has a SMLT connection with both aggregation switches in the other pair. If only one end is split, the topology is referred to as an SMLT triangle.
In an SMLT triangle, the end of the link which is not split does not need to support SMLT. This allows non-Avaya devices including third-party switches and servers to benefit from SMLT. The only requirement is that IEEE 802.3ad static mode must be supported.
Read more about this topic: Split Multi-link Trunking