Aggregation Link Bounces when Using LACP with the Short Timer. (Doc ID 2382710.1)

Last updated on MARCH 16, 2023

Applies to:

Symptoms

An aggregation reports "link down:  - usually for 2-7 seconds, and then back up. 

For example:

Mar 23 16:32:49 <solaris-host> mac: [ID 486395 kern.info] NOTICE: aggr1 link down
Mar 23 16:32:49 <solaris-host> mac: [ID 486395 kern.info] NOTICE: aggr1 link down
Mar 23 16:32:53 <solaris-host> mac: [ID 435574 kern.info] NOTICE: aggr1 link up, 10000 Mbps, full duplex
Mar 23 16:32:53 <solaris-host> mac: [ID 435574 kern.info] NOTICE: aggr1 link up, 10000 Mbps, full duplex

Most often there is no report of the aggregation's underlying interfaces reporting a link event, although there is sometimes a link bounce (with an immediate down/up) of one of the aggregation's NICs.    I appears that some switches will reset Ethernet links to allow a re-sync of the LACP controlled aggregation, which is why the underlying physical interface's link is sometimes seen to "bounce".

Cause

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