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Port Management
Configuring Link Aggregation
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
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 packet header information.
The switch 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/source IP
addresses, and destination/source MAC addresses for all packets.
LAG Management
Active member ports in a LAG are defined statically by explicit user assignment or
are dynamically selected by the LACP. The LACP selection process selects the
active member ports for the LAG after exchanging LACP information between the
local and remote devices.
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 switch supports eight LAGs. Every LAG has the following characteristics:
•
All ports in a LAG must be of the same media type.
•
To add a port to the LAG, it cannot belong to any VLAN except the default
VLAN.
•
Ports in a LAG must not be assigned to another LAG.
•
No more than 8 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 applies 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.
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