EtherChannel — LACP vs PAgP vs static. Trade-offs?

LACP (802.3ad, IEEE standard, multi-vendor) — modes: active (initiates), passive (responds). Negotiation overhead but interoperable across vendors. PAgP (Cisco-proprietary) — modes: desirable (initiates), auto (responds). Faster negotiation but Cisco-only. Static (mode on) — no negotiation, just bundles physically. Fast setup but error-prone (silent misconfig). Best practice: LACP active-active for production multi-vendor environments.

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