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removed, until the LAG is edited and a member is removed (which can be added back
prior to applying); the LACP button then 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.
The device supports two modes of load balancing:
•
By MAC Addresses—Based on the destination and source MAC addresses of all
packets.
•
By IP and MAC Addresses—Based on the destination and source IP addresses for IP
packets, and destination and source MAC addresses for non-IP packets.
LAG Management
In general, a LAG is treated by the system as a single logical port. In particular, the LAG has
port attributes similar to a regular port, such as state and speed.
The device supports 32 LAGs on the 550 series and eight LAGs on the 350 series. with up to
eight ports in a LAG group.
Every LAG has the following characteristics:
•
All ports in a LAG must be of the same media type.
•
Ports in a LAG must not be assigned to another LAG.
•
No more than eight ports are assigned to a static LAG and no more than 16 ports can be
candidates for a dynamic LAG.
•
When a port is added to a LAG, the configuration of the LAG is applied to the port.
When the port is removed from the LAG, its original configuration is reapplied.
•
Protocols, such as Spanning Tree, consider all the ports in the LAG to be one port.
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
Port Management
Link Aggregation
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