Which configuration method in EtherChannel is based on an industry standard?

LACP, or Link Aggregation Control Protocol, is the configuration method in EtherChannel that is based on an industry standard defined by the IEEE (Institute of Electrical and Electronics Engineers) in the 802.3ad specification. LACP allows for the automated bundling of multiple physical Ethernet links into a single logical link, providing increased bandwidth and redundancy.

This standardization means that devices from different manufacturers can interoperate using LACP to negotiate the formation of an EtherChannel, making it a more versatile and widely accepted choice in network deployments compared to proprietary solutions. LACP dynamically manages the aggregation of links, ensuring that if one link fails, the traffic can be rerouted through the remaining active links without manual intervention.

In contrast, while Static Link Aggregation is a valid method, it does not use a protocol for managing the link and does not offer the same level of dynamic management as LACP. PAgP (Port Aggregation Protocol) is another method, but it is a Cisco proprietary protocol, which limits compatibility with non-Cisco devices. Dynamic Protocol Aggregation is not a standard term recognized in relation to EtherChannel configurations. Thus, LACP stands out as the correct answer due to its adherence to an established industry standard.