What if the bandwidth of an interface is not enough?

LACP can Aggregate/Bundle multiple interfaces into a single new interface Link Aggregation Control Protocol. Done by negotiating between the two devices using the LACP protocol and Device Role. - Watch out for both devices, at least one of them must be ACTIVE - Load Balancing Mechanism: by default = src-dst-mac - Both Layer2 (Switches) and L3 (Routers) LACP can be done, But in L3: no need for Negotiating and Device Roles ?