Cisco SR224T Administration Guide - Page 104

Port Management Configuring Link Aggregation 9 • Link Aggregation Overview • Static and Dynamic LAG Workflow • Defining LAG Management • Configuring LAG Settings • Configuring LACP Link Aggregation Overview Link Aggregation Control Protocol (LACP) is part of the IEEE specification (802.3az) that enables you to bundle several physical ports together to form a single logical channel (LAG). LAGs multiply the bandwidth, increase port flexibility, and provide link redundancy between two devices. Two types of LAGs are supported: • Static-A LAG is static if the LACP is disabled on it. The group of ports assigned to a static LAG are always active members. After a LAG is manually created, the LACP option cannot be added or removed, until the LAG is edited and a member is removed (which can be added prior to applying), then the LACP button become available for editing. • Dynamic-A LAG is dynamic if LACP is enabled on it. The group of ports assigned to dynamic LAG are candidate ports. LACP determines which candidate ports are active member ports. The non-active candidate ports are standby ports ready to replace any failing active member ports. Load Balancing Traffic forwarded to a LAG is load-balanced across the active member ports, thus achieving an effective bandwidth close to the aggregate bandwidth of all the active member ports of the LAG. Traffic load balancing over the active member ports of a LAG is managed by a hash-based distribution function that distributes Unicast and Multicast traffic based on Layer 2 or Layer 3 packet header information. Cisco Small Business 200 Series Smart Switch Administration Guide 105