Dears：

Thank you for your assistance. I have a S922 server that has recently been frequently reported error related to LACP out of sync, than recovery immediately, and there is no link error.

The network switch has no error, and LACP transfers health.

I want to find the root cause, and needs your help. Thank you very much.

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Bowen Dai
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Hello,

It looks like the intermittent "LACP out-of-sync" and immediate recovery behavior usually points to a brief synchronization delay rather than a hardware fault. It's hard to say without proper troubleshooting.

Have you checked this knowledgebase article to check in different areas.It can help in diagnosis.

IBM AIX: Troubleshooting "ECH_PORT_OUT_OF_SYN" errors in IEEE 802.3ad Link Aggregation/LACP Etherchannel.

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Rohit Chauhan
Senior Technical Specialist
Norway
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Original Message:
Sent: Thu October 23, 2025 03:49 AM
From: Bowen Dai
Subject: PORT LACP FAILURE

Dears：

Thank you for your assistance. I have a S922 server that has recently been frequently reported error related to LACP out of sync, than recovery immediately, and there is no link error.

The network switch has no error, and LACP transfers health.

I want to find the root cause, and needs your help. Thank you very much.

------------------------------
Bowen Dai
------------------------------

Hi

what is the Primary Aggregation status is Negotiating as per below screen shot and the status should be Aggregated , please double check the configuration from switch side.

• Negotiating: LACP is in progress, but the switch has not yet aggregated the adapters. If the Link Aggregation remains on this status for longer than one minute, verify that the switch is correctly configured. For instance, you should verify that LACP is enabled on the ports.
• Aggregated: LACP has succeeded, and the switch has aggregated the adapters together.

https://www.ibm.com/docs/en/aix/7.2.0?topic=configuration-ieee-8023ad-link-aggregation-troubleshooting

Thank you

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Anas AlSaleh
IBM Power Systems Software Specialist
Saudi Business Machines ( SBM )
Riyadh
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Original Message:
Sent: Thu October 23, 2025 03:49 AM
From: Bowen Dai
Subject: PORT LACP FAILURE

Dears：

Thank you for your assistance. I have a S922 server that has recently been frequently reported error related to LACP out of sync, than recovery immediately, and there is no link error.

The network switch has no error, and LACP transfers health.

I want to find the root cause, and needs your help. Thank you very much.

------------------------------
Bowen Dai
------------------------------