OpenNSL API Guide and Reference Manual: Trunking

Trunking, or Link aggregation, is a mechanism that allows several ports to be bundled together to form a single logical link or trunk. This is useful when higher bandwidth or redundancy between switches, or both, are required.

Trunk port members are always configured for full duplex.
Provides incremental bandwidth based on the system requirements.
Provides link redundancy.
Provides traffic distribution among trunk members.

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