Cisco 300 Series Administration Manual page 156

Port Management
Link Aggregation
Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
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 eight ports are assigned to a static LAG and no more than 16
ports can be candidates for a dynamic LAG.
• All the ports in a LAG must have auto-negotiation disabled, although the
LAG can have auto-negotiation enabled.
• 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.
Default Settings and Configuration
Ports are not members of a LAG and are not candidates to become part of a LAG.
Static and Dynamic LAG Workflow
After a LAG has been manually created, LACP cannot be added or removed until
the LAG is edited and a member is removed. Only then the LACP button become
available for editing.
To configure a static LAG, perform the following actions:
1. Disable LACP on the LAG to make it static. Assign up to eight member ports to
the static LAG by selecting and moving the ports from the Port List to the LAG
Members list. Select the load balancing algorithm for the LAG. Perform these
actions in the LAG Management page.
2. Configure various aspects of the LAG, such as speed and flow control by using
the LAG Settings page.
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