API Guide

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 nonfallback port is configured with low priority.
● When a low-priority port becomes operationally UP.
● When a port with the least numbering is operationally UP.
● If nondefault LACP port priority is configured on a port even though preemption is disabled, aport with
the lowest priority is elected as fallback port,
● The lacp fallback preemption disable command is not applicable on port priority events
that you have configured 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
Configures 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.
Example
OS10# configure terminal
OS10(config)# interface port-channel 1
OS10(conf-if-po-1)# lacp fallback timeout 20
Supported
Releases
10.3.2E(R3) or later
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