Connectivity Guide

Usage Information The no version of this command disables LACP fallback mode.
Example
OS10# configure terminal
OS10(config)# interface port-channel 1
OS10(conf-if-po-1)# lacp fallback enable
Supported Releases 10.3.2E(R3) or later
lacp fallback preemption
Enables or disables LACP fallback port preemption.
Syntax
lacp fallback preemption {enable | disable}
Parameters
• enable—Enables preemption on the port-channel.
• disable—Disables preemption on the port-channel.
Default Enabled
Command Mode Port-channel INTERFACE
Usage Information
When you enable preemption, the fallback port election preempts the already elected fallback port and elects a
new fallback port.
The new port is elected based on the following events:
• When a non-fallback port congured with low priority.
• When a low-priority port becomes operationally UP.
• When a port with the least numbering is operationally UP.
• A port with the lowest priority is elected as fallback port, if non-default LACP port priority is congured on a
port even though preemption is disabled.
• The lacp fallback preemption disable command is not applicable on port priority events that you
have congured or triggered.
Example
OS10# configure terminal
OS10(config)# interface port-channel 1
OS10(conf-if-po-1)# lacp fallback preemption enable
OS10# configure terminal
OS10(config)# interface port-channel 1
OS10(conf-if-po-1)# lacp fallback preemption disable
Supported Releases 10.4.1.0 or later
lacp fallback timeout
Congures LACP fallback time out period.
Syntax
lacp fallback timeout timer-value
Parameters timer-value—Enter the timer values in seconds, ranging from 0 to 100 seconds.
Default 15 seconds
Command Mode Port-channel INTERFACE
Usage Information The no version of this command returns the timer to default value.
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