Cisco Catalyst 2960 Series, Configuration Manual

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Configuring Auto-LAG on a Port Interface, on page 356
Configuring Persistence with Auto-LAG, on page 357
Auto-LAG Configuration Guidelines, on page 342
Auto-LAG Configuration Guidelines
Follow these guidelines when configuring the auto-LAG feature.
• When auto-LAG is enabled globally and on the port interface , and if you do not want the port interface
to become a member of the auto EtherChannel, disable the auto-LAG on the port interface.
• A port interface will not bundle to an auto EtherChannel when it is already a member of a manual
EtherChannel. To allow it to bundle with the auto EtherChannel, first unbundle the manual EtherChannel
on the port interface.
• When auto-LAG is enabled and auto EtherChannel is created, you can create multiple EtherChannels
manually with the same partner device. But by default, the port tries to create auto EtherChannel with
the partner device.
• The auto-LAG is supported only on Layer 2 EtherChannel. It is not supported on Layer 3 interface and
Layer 3 EtherChannel.
Related Topics
Configuring Auto-LAG Globally, on page 355
Configuring Auto LAG: Examples, on page 360
Configuring Auto-LAG on a Port Interface, on page 356
Configuring Persistence with Auto-LAG, on page 357
Auto-LAG, on page 341
How to Configure EtherChannels
After you configure an EtherChannel, configuration changes applied to the port-channel interface apply to all
the physical ports assigned to the port-channel interface, and configuration changes applied to the physical
port affect only the port where you apply the configuration.
Configuring Layer 2 EtherChannels
You configure Layer 2 EtherChannels by assigning ports to a channel group with the
channel-group
interface
configuration command. This command automatically creates the port-channel logical interface.
If you enabled PAgP on a port in the auto or desirable mode, you must reconfigure it for either the on mode
or the LACP mode before adding this port to a cross-stack EtherChannel. PAgP does not support cross-stack
EtherChannels.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
342
How to Configure EtherChannels