How EtherChannel bundles multiple physical links into a single logical channel to defeat STP's bandwidth ceiling, with full coverage of LACP, PAgP, static mode, load-balancing algorithms, Layer 2 vs Layer 3 port-channels, and the silent mismatch failures that break aggregation without a clear error message.
Etherchannel
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EtherChannel and Link Aggregation: LACP, PAgP, and When STP Blocks Half Your Bandwidth