Configuring EtherChannel with LACP on Cisco Catalyst Switches
LACP bundles multiple physical links into one logical pipe—doubling or quadrupling bandwidth while keeping STP happy and providing automatic failover.
link-aggregation
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EtherChannel Fundamentals: Link Aggregation, PAgP vs LACP, and Load Balancing
EtherChannel presents multiple physical links as a single logical interface to the spanning tree algorithm, eliminating blocked ports and enabling true line-rate redundancy.