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Inconsistency of LACP Timeout Fields on Two Interconnected Devices Caused Inconsistent Packet Transmission Frequencies

Publication Date:  2013-09-26 Views:  21 Downloads:  0
Issue Description
A Huawei device and a third-party device interconnected through LACP. The LACP timeout period on the Huawei device was the default value (3s) and that on the third-party device was also the default value (90s). The LACP packet transmission frequency on the Huawei device was 1/3 of that on the third-party device.
Handling Process

Huawei performed the following operations to address the problem:

1. Checked the packet transmission frequencies at the two ends.
They were different.

2. Checked configurations at the two ends.
The configurations were default configurations. Devices from different vendors process protocols differently.

3. Enabled the packet debug switch to check LACP packets.
The timeout field was 1 (indicating a short timeout period) in LACP packets from one end, and 0 (indicating a long timeout period) in those from the other end.
Root Cause

According to IEEE 802.3ad, the timeout field in an LACP packet can control the LACP packet transmission frequency of the remote end as follows:

1. If the short timeout is configured at the local end, the remote end transmits one LACP packet every second.

2. If the long timeout is configured at the local end, the remote end transmits one LACP packet every 30 seconds.
Solution
Configure the timeout fields at the two ends consistently.
Suggestions
Ensure that configurations on two interconnected devices from different vendors are compliant to protocols and consistent if possible.

END