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Link Aggregation Control Protocol (LACP) Fallback Option

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TitleLink Aggregation Control Protocol (LACP) Fallback Option
Symptoms
The LACP Fallback feature lets you select a single port that is automatically added to the aggregator if LACP data units (LACPDUs) do not appear on any of the member ports within the specified period of time. If LACPDUs are exchanged before this timeout expires, an aggregator is formed using traditional means. If LACPDUs are not received, an active port with the lowest priority value is automatically added to the aggregator (enters fallback state). If ports have the same priority value, the lowest port number on the lowest slot number is chosen.

This is ideal in a situation when devices supporting LACP are replaced with defaulted devices with LACP disabled, allowing the AP to function without LACP due to the LACP Fallback option on the switch being configured. LACP can then be later configured but allowing minimal downtime.

 
Environment
EXOS v16.2.1.6 and v21.1.1.4 and greater.
Cause
Non-LACP devices will not communicate over an LACP connection.
Resolution
Configure the fallback option to remove the switch port from the LACP group once LACPDUs are no longer received:
 
configure sharing port lacp fallback [enable | disable]


Issue the show lacp lag group-id detail command to verify fallback configuration:
 
Enabled : Yes
LAG State : Up
Unack count : 0
Wait-for-count : 0
Current timeout : Long
Activity mode : Active
Defaulted Action : Delete
Fallback : Enabled
Fallback timeout : 40 seconds
Receive state : Enabled
Transmit state : Enabled


Change the timeout value using the following:
 
configure sharing port lacp fallback timeout seconds
Additional notes

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