Both Link Aggregation and Port Redundancy are configured on the Advanced view of the Edit Interface dialog in the SonicOS Management Interface.
Link Aggregation - Groups multiple Ethernet interfaces together forming a single logical link to support greater throughput than a single physical interface could support. This provides the ability to send multi-gigabit traffic between two Ethernet domains.
Port Redundancy - Configures a single redundant port for any physical interface that can be connected to a second switch to prevent a loss of connectivity in the event that either the primary interface or primary switch fail.