LACP — Link Aggregation Control Protocol
Definition
A standards-based protocol (IEEE 802.3ad) for combining multiple physical Ethernet links into a single logical link for increased bandwidth and redundancy.
Context & Usage
LACP-bonded interfaces appear to the OS as a single high-bandwidth NIC. Two endpoints negotiate which physical links are active members. Common configurations: 2× 10 GbE = 20 GbE aggregated, 4× 25 GbE = 100 GbE aggregated. Provides automatic failover when individual links fail. Supported by all major switches (Cisco, Aruba, Juniper, Arista) and modern operating systems.
Examples
- Linux bond0 with 2× 10 GbE in LACP mode
- Cisco Catalyst port-channel with 4× 25 GbE
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