Port Management
Configuring Link Aggregation
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x 114
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Configuring Link Aggregation
Link Aggregation Control Protocol (LACP) is part of an IEEE specification (802.3az)
that allows you to bundle several physical ports together to form a single logical
channel. Link aggregation optimizes port usage by linking multiple ports together
to form a Link Aggregation Group (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. A 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. A group of ports
assigned to dynamic LAG are candidate ports. LACP determines which
candidate ports are active member ports. The nonactive candidate ports
are standby ports ready to replace any failing active member ports.
This section describes how to configure the link aggregation features and includes
the following topics:
• Load Balancing
• LAG Management
• Static and Dynamic LAG Workflow
• Configuring LAG Management
• Configuring LAG Settings
• Configuring LACP
Load Balancing
Traffic forwarded to a LAG is load-balanced across the active member ports,
which achieves 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 packet header information.
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