Port Management
Link Aggregation
170
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
10
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 350 family of devices support up to 8 LAGs. The 550 family of devices support up to 32
LAGs. All devices support up to 8 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.
Default Settings and Configuration
By default, 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
page.
2. Configure various aspects of the LAG, such as speed and flow control by using the
page.
