LACP

LACP is a standard protocol (802.3ad/802.1AX) used to negotiate link aggregation (EtherChannel).

Updated: 2026-03-05

Definition

LACP dynamically negotiates link aggregation to form a bundle safely and detect misconfigurations.

It is the open standard alternative to Cisco PAgP.

Key points

Standards-based link aggregation
Negotiation helps prevent loops/mismatch
Active/Passive modes form channels

Common mistakes

Mixing static and LACP settings across ends.
Not matching trunk/access mode on member links.

Related exams

Cisco CCNA (200-301)

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